Journal articles: 'Steel rolling mill'

1

Abdulrahman, Alaa Muheddin. "Conventional Control of Loop-Height in Steel Rolling Mill." Journal of Zankoy Sulaimani - Part A 11, no. 1 (January 30, 2008): 81–87. http://dx.doi.org/10.17656/jzs.10183.

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Jiao, Zhi Jie, Jian Ping Li, and Jie Sun. "A Pilot Rolling Mill Designed for High Strength Steels." Materials Science Forum 654-656 (June 2010): 210–13. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.210.

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High strength steels, such as austenitic stainless steel, Transformation Induced Plasticity (TRIP) steel and silicon steel, have significant work hardening during cold rolling, which in turn induces a quickly increased rolling force. Tension plays a very important role in the reduction of the rolling force. However, coiler tension control system used in the classic experimental rolling mill requires long-scale strip, which cannot be satisfied for most experimental cases. To overcome this drawback, a new pilot rolling mill has been developed. The horizontally located hydraulic cylinders and clamps have been used to apply tension to the rolled short-scale strip. With this rolling mill, the austenitic stainless steel strip, TRIP steel strip and other high strength strips have been studied.

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Przondziono, Joanna, and Jan Szymszal. "Steel Strips Flattening in Ball Rolling Mill." Solid State Phenomena 165 (June 2010): 153–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.165.153.

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An effective and efficient production method of narrow and thin strips made of steel, non-ferrous metals and their alloys is wire flattening in a ball rolling mill. In this device cylindrical rollers have been replaced with balls of diameter ca. 15 mm. Proper selection of deformation process parameters enables to obtain strips with the required geometrical characteristics. Experimental planning method was applied to evaluate the influence of flattening process technological parameters on strip geometrical features. Statistical analysis enabled to determine mathematical models of stainless steel 5XCrNi18-10 strips flattening. It was established that strip widening depends on ball roughness, draft applied, relation of wire diameter to ball diameter, back-tension stress. Strips flatness depends on draft applied. It was observed that strips feature uniform thickness over their width, parallel flat surfaces, narrow dimensional tolerance, high quality surface and naturally rounded edges.

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Borisov, I. A., and S. S. L’vova. "Choice of steel for rolling mill rolls." Metal Science and Heat Treatment 51, no. 5-6 (May 2009): 272–77. http://dx.doi.org/10.1007/s11041-009-9145-5.

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Lezhnev, S. N., A. B. Naizabekov, I. E. Volokitina, E. A. Panin, and E. I. Kuldeyev. "Radial-shear rolling as a new technological solution for recycling bar scrap of ferrous metals." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 316, no. 1 (March 15, 2021): 46–52. http://dx.doi.org/10.31643/2021/6445.06.

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Waste recycling of both ferrous and non-ferrous metals is a useful process for the economy of any country. This paper proposes a new technology for recycling bar scrap of ferrous metals by rolling it in radial-shear rolling mills by producing a commercial product in the form of bars with an ultrafine-grained gradient structure. Studies have shown that the deformation of bar scrap in the form of pieces of reinforcement made of steel grade 18G2S in a radial-shear rolling mill makes it possible to significantly disperse its structure by producing a gradient ultrafine-grained structure, and this, in turn, leads to the elevating of the mechanical characteristics of this steel grade. Thus, the tensile limit of the 18G2S grade steel deformed on the radial-shear rolling mill was 620 MPa (at the initial value of 365 MPa).

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Han, Xing, and Lian Jin Li. "Dynamic Response Analysis of Tandem Rolling Mill in Rolling Process." Key Engineering Materials 764 (February 2018): 391–98. http://dx.doi.org/10.4028/www.scientific.net/kem.764.391.

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Due to the influence of rolling force fluctuations, tube size changes and material uniformity and other factors, vibration and other phenomenon inevitably occur in the rolling process of tandem rolling mill. This vibration has a great impact on the dynamic stability of the mill and rolling reduction, and will significantly reduce the dimensional accuracy and surface quality of seamless steel pipe. In this paper, the non-linear finite element software ABAQUS is used to simulate the rolling process of seamless steel pipe. First, rolling force of the first frame with the maximum rolling force of PQF rolling mill is calculated. The reliability of rolling force calculated by the finite element method is verified by the test experiment. The dynamic response analysis of the roll is carried out to obtain the dynamic response curve of the roll in the rolling state and to provide technical support for the rolling schedule with the calculated rolling force being the load.

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Feng, Yong, and Hao Sun. "Optimization Results of High Strength Steel Production Process." Advanced Materials Research 26-28 (October 2007): 11–14. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.11.

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The grade 590MPa high strength steel for construction machine and mine machine can be produced in mass and at lower cost with optimization of chemical composition and production process. The thickness of steel plates is from 6 mm to 60 mm. The microalloy system can be designed as Nb-V,Nb-Ti or Nb-Ti-V. Due to application of controlled rolling and controlled cooling (thermal mechanical control process TMCP) the properties of steel plates are perfect. Test and process simulation be conducted in lab rolling mill. The results and process were transplanted to middle plate mill and heavy plate mill, the process parameter can be matched well and appropriately, the production process is smooth and properties of steel plates are excellent and stable. The new manufacture technology for production of 590MPa high strength steels is opened up. The output of 590MPa high strength steels has been reached more than 81000 tons every year in Jinan Iron and Steel Co. Ltd. and it meet the needs of market preferably. The application of this type high strength steel can create a great of economy and social profits.

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Vasilev, Ya, D. Samokysh, S. Zhuravlova, Yu Projdak, and R. Zamogilniy. "State of production sheet steel rolled stock in the world and tendencies of development of cold strip rolling mills." Theory and practice of metallurgy 1, no. 1 (January 21, 2019): 15–28. http://dx.doi.org/10.34185/tpm.1.2019.02.

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The conditions of production and the most relevant directions of development of technology and equipment of cold rolling mills for the production of thin flat rolled steel are investigated, analyzed and summarized. A comparative analysis of cold rolling technology is carried out, which is implemented in continuous and reversed modes of mill. The technological limitations and criteria for the development of deformation modes on cold rolling strip mills, which allow to expand the assortment towards a smaller thickness, are given. A method for determining the thickness is proposed, and a series of thicknesses of thin (1.5-1.8 mm) hot-rolled break-down are recommended for the production of tinplate of single rolling and thin strips of high quality. The method of calculation schedule drafting on a specific mill is developed. The technique of determination of the smallest thickness of a strip on a concrete mill is presented, taking into account the influence of rigidity of the working cage and features of the force load of the roller node with a decrease in the thickness and width of the strip. The use of the above materials allows to select and justify the optimal variant of cold band rolling technology, as well as to develop rational deformation modes that ensure the implementation of the cold rolling process with maximum efficiency, given the desired range and the required volume of thin cold-rolled sheet steel or tinplate. As a result of taking into account the features of the force interaction of the thin strip with the rolls during cold rolling and the rigidity of the working stands of the mill, the accuracy and reliability of determining the parameters are increased, it opens additional possibilities for expanding the range of cold rolling mills towards smaller thicknesses.

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Mazur, Igor, Aleksandr P. Dolmatov, and Sergey S. Borisov. "Investigation and Numerical Modeling of the Process of Cold Rolling HSLA Steels." Materials Science Forum 704-705 (December 2011): 832–41. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.832.

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Considering the problems and details of modeling process of cold rolling, it was constructed a theoretical model of deformation area based on a set of equations, which were practical testing. The model is based on cold-rolled numerical solution of differential equations of forces equilibrium in the deformation area by Karman. In the model there are included modules for calculating strip temperature and strip gage at the exit from the stand, considering elastic recovery of the strip. For adaptation of the equations to the specific conditions of cold rolling of HSLA steels in the continuous five stand mill 2030 and assess the deviation of calculated data from the actual, a procedure of correction for hardening curve of rolled steel has been developed. The model allows defining the energy-power parameters of rolling: average unit rolling force, the full force of rolling, rolling moment, rolling force, an average temperature of strip at the inlet and outlet of each of the mill stands, steel hardening curve when rolling. The model is implemented as software using object-oriented approach in the language of C++ Builder.

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Chandra Gupta, Yogesh, Kamal Bansal, and S. N.Sriniwas. "Secondary steel mill furnace performance." International Journal of Engineering & Technology 7, no. 2.6 (March 11, 2018): 102. http://dx.doi.org/10.14419/ijet.v7i2.6.10076.

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Energy in a steel re-rolling mill is mainly consumed in furnaces. Therefore, furnace performance is very important and its contribution in the cost of product is very high. Data has been collected for two different furnaces in Stackle mill and analyzed for performance of furnace. In this paper, effect of furnace performance on secondary steel sector is analyzed. These data about performance is collected on Walking beam furnace in Stackle mill and Re-heating furnace.

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Gao, Xiu Hua, Hui Fang Lan, Lin Xiu Du, and Chun Lin Qiu. "Development of Reduced Rolling Process for Steel Plate." Materials Science Forum 706-709 (January 2012): 2101–6. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.2101.

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The low cost Q460 and Q550 steel plates were produced in the 4200mm wide and heavy plate mill using Normal Hot Rolling and High Rate Cooling (NHR+HRC) process. The effect of both rolling processes on microstructure and mechanical property was studied. The results indicate that new type process can realize the good match between microstructure and mechanical properties. Meanwhile the new technology can short rolling time, reduce alloying addition, and improve the output of mill, it is also promote iron and steel industry developing continuously.

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12

Salem, Shabur. "Alloyed steel intended for hot rolling mill rolls." Metal Science and Heat Treatment 35, no. 11 (November 1993): 657–59. http://dx.doi.org/10.1007/bf00712290.

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13

Feng, Xian Zhang, and Jen Feng Wang. "Load Distribution of Rolling Bearing for Steel Shapes Universal Roll Mill." Key Engineering Materials 439-440 (June 2010): 23–28. http://dx.doi.org/10.4028/www.scientific.net/kem.439-440.23.

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At the stage of the start and end for rolling H-beam by universal rolling method, there exists biting and tailing-out phenomenon in the stage, the rolling bodies endures repeating impact loading for the bearings. In order to ensure the working safety and reliability for universal roll mill, according to Hertz contact theory, small deformation superposition principle, and etc. Setting bearing clearance is 0.1 mm, maximum rolling force is 8000 KN for the level rollers, without consideration of influence of friction, and researches and deduces the mathematic models of force calculation for rolling bodies. The results shows that the thickness of the rolling bearing had very little effect on load distribution of rolling body, the calculated results coincide better with finite element results, and the achievements can supply a reference of the production of hot rolling for H-beam.

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Chernykh, I. N., K. V. Shendyapin, E. A. Geim, D. V. Ovchinnikov, I. N. Krivonogov, and K. V. Bol’nykh. "Study of deformation conditions at longitudinal pipes rolling from austenite steel grades." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 77, no. 3 (March 28, 2021): 312–19. http://dx.doi.org/10.32339/0135-5910-2021-3-312-319.

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Stainless steels of austenite class 08–12Х18Н10Т have a high corrosion resistance, which stipulates for their wide application in various areas of industry. Technology of pipes production of the steels is rather specific and requires observation of some conditions. It was shown that temperature of a work-piece heating before deformation is an important parameter of the technology. It was noted that for the piercing of a steel work-piece with various chrome content, there is a rational temperature interval. Nonobservation of the temperature can lead to defects formation on internal pipe surface because of earlier destruction and opening of metal cavity during piercing. The choice of the rolling-out scheme has a direct effect on the work-piece forming in cross-sections. Results of hot rolling of Ø37×2,5 tube samples, manufactured of 08–12Х18Н10Т steel and carbon steel of grade 40 presented. The rolling was done at a laboratory mill. As a result of the experiment the lower limit of ovality of rolls grooves was specified for conditions of rolling of pipes from 08–12Х18Н10Т steels by 2-roll scheme. At the rolling with ovality B/H ≤1,07, defects appeared on the internal tube surface in the form of scratches caused by the mandrel. The rational range of ovality of grooves at multi-stand rolling can be from 1.08 to 1.15. According to criterion of groove overfilling by metal for steels 08–12Х18Н10Т, requirements were formed towards the groove width of the first stand of longitudinal rolling mill. The groove width must be larger than the sleeve diameter: for 3-roll scheme – at least by 2–3%, for 2-roll scheme – at least by 7.0–7.5%. Potential advantages of 3-roll scheme comparing with 2-roll scheme for rolling of 08–12Х18Н10Т steels were established as follows: lower probability of grooves overfilling by metal of the work-piece, absence of defects (scratches caused by mandrel), on the tube internal surface at minimal ovality level of 1.07, lower level of transverse pipe wall non-uniform thickness.

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Siciliano, Fulvio. "Mathematical Modelling of Hot Rolling: A Practical Tool to Improve Rolling Schedules and Steel Properties." Materials Science Forum 762 (July 2013): 210–17. http://dx.doi.org/10.4028/www.scientific.net/msf.762.210.

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Most of the commercial metallic materials undergo at least one hot deformation stage during fabrication. Hot deformation processing leads to the production of plates, strips, rods, pipes and other shapes at lower overall cost when compared to the cold deformation/annealing route. Comprehensive study of the metallurgical phenomena during hot deformation has enormous potential application in the control of industrial rolling processes. Understanding of the microstructural and mean flow stress evolution lead to sound steel developments and innovative rolling schedules. The models predict parameters such as grain size, fractional softening (static and dynamic) and strain induced precipitation which are useful to improve rolling schedules. Effects such as incomplete softening and strain accumulation can be easily detected as well as their consequences on the final grain size and mechanical properties. In this regard, special attention must be given to steels, the most important metallic material in terms of history, present and future. In this paper, three hot rolling routes will be analyzed in order to produce high strength linepipe steels. Examples were selected on how the use of modelling during development stage can help to meet mechanical properties, mainly toughness and drop weight tear test. Firstly, it is presented a brief overview on mathematical models applied to hot rolling. Thin slab casting/direct rolling, hot strip mill and plate mill are exemplified in the present work. The development of new steel grades can greatly accelerated with the aid of modelling, which is an useful, low-cost technique.

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Xie, Zhi Jiang, Chang Gui Xie, and Ping Chen. "Analysis and Control of Chatter Marks of Strip Steel on HC Cold Rolling Mill." Advanced Materials Research 562-564 (August 2012): 895–98. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.895.

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According to the chatter marks on strip steel of HC cold rolling mill , by analysis the collected vibration and simulation analysis on rolling mill, it is found that chatter marks of strip steel surface cuased by the Seventh-order natural frequency. Then, for analysising cuase of chatter marks on strip steel surface, relevant inhibiting chatter marks measures is put forward, and the measures are used for production which got a good inhibition effect of chatter marks.

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Lee, Jung-Kil, Kwan-Woo Kim, and Hae-Yong Cho. "FEA of Pipe Rolling Process Using Planetary Rolling Mill for Stainless Steel." Journal of the Korean Society of Marine Engineering 35, no. 2 (March 31, 2011): 244–51. http://dx.doi.org/10.5916/jkosme.2011.35.2.244.

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Ogoltcov, Alexey, Dmitry Sokolov, Semen Sokolov, and Alexander Vasilyev. "Computer Model STAN 2000 and its Use in Practice of Steels Hot Rolling on Mill 2000 of Severstal." Materials Science Forum 854 (May 2016): 183–89. http://dx.doi.org/10.4028/www.scientific.net/msf.854.183.

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An integral computer model/program STAN 2000 for simulation of steels hot rolling on mill 2000 of SEVERSTAL was developed. The capacity of the model includes, for example, the following features:‒ control of power parameters and prediction of hot strip temperature for a given rolling and accelerated cooling regimes;‒ follow-up of the evolution of steel microstructure at all stages of strip production and prediction of ultimate mechanical properties (yield stress, ultimate tensile stress and relative elongation);‒ optimization of rolling regimes for existing steel grades and developing them for a new ones.The STAN 2000 program is written in С++ programming language and can work on all modern Microsoft Windows family operating systems. The program has a well-designed and user-friendly interface facilitating its practical use.The integral model was calibrated using an extensive data base on rolling regimes and forces, measured temperatures and final mechanical properties for a number of steel grades rolled on mill 2000 of SEVERSTAL with chemical compositions covering the following ranges of alloying elements content (mass.%): С(≤0.65); Mn(≤2.0); Si(≤1.0); Cr(≤0.9); Ni(≤0.6); Cu(≤0.5); Mo(≤0.4); Nb(≤0.05); V(≤0.065); Ti(≤0.06); B(≤0.003).Some results of calculations performed with STAN 2000 program for temperatures, rolling forces and mechanical properties are presented and compared with experimental data. Some examples of the program utilization in hot strip production on mill 2000 of SEVERSTAL are presented and discussed.

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Yuan, Kai Shi, Long Long Chen, and Sheng Qi Guan. "The Rolling Mill Deviation Analysis and Improvement in Hydraulic Pressure." Applied Mechanics and Materials 333-335 (July 2013): 2080–84. http://dx.doi.org/10.4028/www.scientific.net/amm.333-335.2080.

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This paper introduces the working principle and the failure phenomenon of the steel hydraulic station of Xian steel rolling mill, Shaanxi Longmen Iron & Steel Co., Ltd. We made a synthesis of the reasons of the failure phenomenon. On this basis, we put forward the improvement measures about the steel hydraulic system. The work showed that this improved method can effectively solve the failure phenomenon of the Steel hydraulic station, thereby achieves good results and a certain economic and social benefit.

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Aoh, Jong Ning, Han Kai Hsu, Wei Ting Dai, Chun Yen Lin, and Yen Liang Yeh. "Numerical Simulation on Correcting Camber and Wedge of Steel Slabs in Hot Rolling Mill." Key Engineering Materials 626 (August 2014): 570–75. http://dx.doi.org/10.4028/www.scientific.net/kem.626.570.

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In the hot rolling process, the steel slab may experience a temperature gradient along its transverse direction which may cause camber and wedge after rolling. Camber and wedge phenomenon will affect the quality of the steel plate. To eliminate camber and wedge phenomenon, a pair of side guides is placed before and behind the hot rolling mill. The position mode and the force mode are the control modes for side guides to correct the slab shape and to guide the slab to follow rolling direction. Finite element analysis using ABAQUS was applied to simulate hot rolling process to find the correction mechanism of rolling equipment. The centerline of slab was traced and the shape of slab was predicted. The difference of rolling load between work side and drive side of roller was determined. Furthermore, the load, stress and velocity distribution on the slab at roll bite were analyzed. By using numerical model, hot rolling parameters including side guide control strategy can be predicted, which can provide the hot rolling line as a guideline to improve the quality of the steel slab.

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Garcia Reis, Emanuelle, and Ronaldo Barbosa. "Grain Size Modeling during Hot Rolling of a Nb Microalloyed Steel Beam." Materials Science Forum 753 (March 2013): 397–402. http://dx.doi.org/10.4028/www.scientific.net/msf.753.397.

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Hot rolling of beams is carried out essentially in two stages. Roughing is performed in a reversing mill at temperatures in the range of 1100 oC, at relatively low strain rates and with long interpass times. Finishing is carried out in a reversing two stand mill at temperatures in between 1000 and as low as 700 oC considering parts of the web in the last passes. Strain rates are moderate and interpass times are in the range of 5 to 20s. There is, therefore, as it can be seen from the description just made of the rolling schedule, a fair resemblance to deformation in plate mills. Technology for themomechanical processing, TMP, of plates is very well known and disseminated. Application of this technology to beam rolling is, on the other hand, rather seldom known of. This paper addresses an application of TMP plate technology to beam rolling. In particular, austenite grain size evolution is examined. The usage of Nb microalloyed steels to this process is discussed in terms of possible beneficial effects to ferrite grain refinement.

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Nandakumar, Mohanraj, Sankaran Ramalingam, Subashini Nallusamy, and Shriram Srinivasarangan Rangarajan. "Hall-Sensor-Based Position Detection for Quick Reversal of Speed Control in a BLDC Motor Drive System for Industrial Applications." Electronics 9, no. 7 (July 16, 2020): 1149. http://dx.doi.org/10.3390/electronics9071149.

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This paper proposes the novel idea of eliminating the front-end converters used indirect current (DC) bus voltage variation, thereby allowing for control of the speed of the brushless direct current (BLDC) motors in the two-quadrant operation of a permanent magnet brushless direct current (PMBLDC) motor, which is required for multiple bi-directional hot roughing steel rolling mills. The first phase of steel rolling, the manufacture of plates, strips etc., using hot slabs from the continuous casting stage, is carried out for thickness reduction, before the same is sent to the finishing mill for further mechanical processing. The hot roughing process involves applying high, compressive pressure, using a hydraulically operated mechanism, through a pair of backup rolls and work rolls for rolling. Overall, the processes consist of multiple passes of forward and reverse rolling at increasing roll speeds. The rolling process was modeled, taking into account parameters like roller dimensions, angle and length of contact, and rolling force, at various temperatures, using actual data obtained from a steel mill. From this data, speed and torque profiles at the motor shaft, covering the entire rolling process, were created. A profile-based feedback controller is proposed for setting the six-pulse inverter frequency and parameters of the pulse width modulated (PWM) waveform for current control, based on Hall sensor position, and the same is implemented for closed loop operation of the brushless direct current motor drive system. The performance enhancement of the two different controllers was also evaluated, during the rolling of 1005 hot rolled (HR) steel, and was taken into consideration in the research analysis. The entire process was simulated in the MATLAB/Simulink platform, and the results verify the suitability of an entire-drive system for industrial steel rolling applications.

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Li, Xiao Ying, Rui Cheng Zhang, Tao Shi, and Jia Cheng. "Research on Chaotic and Control of the Rolling Mill Main Drive System." Applied Mechanics and Materials 321-324 (June 2013): 1675–78. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.1675.

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Rolling mill as a class of key iron and steel industry metallurgical equipment, responsible for the national production of heavy plate strip, its productivity and product quality of course become the focus of attention. In a large rolling mill equipment, rolling mill drive system as the interface with the electrical system, electrical energy into mechanical energy, and rolled steel production process to meet the torque and speed required for high precision and high dynamic control performance. In this paper, plate and strip rolling mill of the early nonlinear dynamic system as the research object, through theoretical analysis, numerical simulation and experimental study, done the following work.For the beginning of the process of rolling mill main drive system of the nonlinear characteristics of chaotic motion, through the theoretical analysis has proved that the original vibration system to become passive equivalent non-linear systems, the use of passive non-linear system characteristics, a class of moving boundary mechanical vibration system to exert control over the chaotic behavior, simulation experiments show that the control strategy is not only achieved rapid control of the system, and control is simple, easy to achieve.

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Jiao, Zhi Jie, Chun Yu He, Jian Ming Sun, and Ying Zhang. "Computer Control System Development for the New Type Pilot Cold Rolling Mill." Advanced Materials Research 472-475 (February 2012): 3043–46. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.3043.

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According to the requirement to the pilot mill for the cold rolling process research work, new type pilot reverse cold rolling mill is designed. Computer control system, including primary automation system, process automation system and human machine interface (HMI) system, is developed for this mill. Technological control function such as electric position control, hydraulic tension control, automatic gauge control (AGC), and process control functions such as model setup calculation, process tracking, actual data treatment are realized. This new type pilot cold rolling mill has been used successfully in several iron steel companies.

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Artiukh, Viktor, Vladlen Mazur, Sergey Kargin, and Nikolay Bushuev. "Reasonability to use device for making horizontal wedge thrust of rolling stand." MATEC Web of Conferences 170 (2018): 03011. http://dx.doi.org/10.1051/matecconf/201817003011.

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Necessity and reasonability to use gapless connection between contact surfaces of lining straps of work rolls chocks and facing strips of housings (inner lining straps of back-up rolls chocks) to reduce dynamic horizontal forces during rolling and increase durability of equipment are considered. Technical solution is described on base of roughing reversing rolling stand of thick sheet rolling mill 3000 of PJSC ‘ILYICH iron and steel works’ (Mariupol city, Ukraine) which can be used on most heavy loaded sheet and tube rolling mills.

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Qing, Jian Qing, Bao Qiao Wu, Jie Cai Wu, and Yi He. "Effect of Lower Final Rolling Temperature on Mechanical Properties of V-N Microalloyed Mild Steel." Materials Science Forum 561-565 (October 2007): 45–48. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.45.

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The samples of V-N microalloyed mild steel were obtained in duo mill with the normal deformation rate and the normal rolling temperature except final rolling temperature, which is at 780°C, 730°C and 680°C respectively. The tensile test was carried out and the microstructure was observed with optical microscope. It was found that the mechanical properties improved dramatically compared with normal process, the final rolling temperature is more than 900°C. The main reason is the fine grain size and second phase particles. With the final rolling temperature decreasing, the mechanical property further improves until the final rolling temperature of 700°C.

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Li, Sheng Zhi, Jie Xu, Yuan De Yin, J. G. Xue, and Y. Feng. "The Study of Inner Surface Crack Formation of Seamless Modified 9Cr-1Mo Tube Rolled on Mandrel Mill and Its Application." Materials Science Forum 561-565 (October 2007): 61–64. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.61.

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The hot workability of modified 9Cr-1Mo, as a grade of heat resistant steels, is inferior to that of low-alloy steel, so the inner surface crack (ISC) easily occurs in seamless boiler tubes produced by the Mandrel Mill under improper rolling conditions. With the aid of FEM, the metal flow status during the rolling process was analyzed in 140mm 8-stand mandrel mill of Bao Steel. Both the metallographic shape and size of the ISC together with the result from the simulation show that the ISC of seamless tube forms at the elongation stage of shell. The mechanism of the ISC was discussed. With its initiation in stand No.1 and No.2 due to poor hot workability of modified 9Cr-1Mo steel, the ISC develops in subsequent passes. Based upon the mechanism devised was a special roll pass system which substantially upgraded the yield of qualified products.

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Meehan, Paul A. "Vibration Instability in Rolling Mills: Modeling and Experimental Results." Journal of Vibration and Acoustics 124, no. 2 (March 26, 2002): 221–28. http://dx.doi.org/10.1115/1.1456457.

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Models for the occurrence of the vibrational instability during rolling known as third octave chatter are presented and discussed. An analysis of rolling mill chatter was performed for the purpose of identifying characteristics of the vibrations and to determine any dependency on the rolling schedule. In particular, a stability criterion for the critical rolling speed is used to predict the maximum rolling speed without chatter instability on schedules from a 5 stand tandem mill rolling thin steel product. The results correlate well with measurements of critical speed occurring on the mill using a vibration monitor. This research provides significant insights into the chatter phenomena and has been used to investigate control methods for suppression of the instability.

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Fukuyama, S., S. Yamauchi, T. Iwanami, K. Kizaki, and K. Satoh. "Development of steel foil rolling technology by FCC-mill." Bulletin of the Japan Institute of Metals 26, no. 6 (1987): 526–28. http://dx.doi.org/10.2320/materia1962.26.526.

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NISHI, Hidetoshi. "Rolling Mill for High Quality Steel Sheet and Strip." Journal of the Society of Mechanical Engineers 108, no. 1039 (2005): 476–77. http://dx.doi.org/10.1299/jsmemag.108.1039_476.

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Stepanov, G. V., L. N. Kallina, and E. M. Kolomiets. "Controlled rolling of steel plates on A 2800 mill." Metallurgist 32, no. 3 (March 1988): 121–22. http://dx.doi.org/10.1007/bf00740775.

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Garbarz, B., M. Adamczyk, and B. Niżnik-Harańczyk. "Development of Structural Steel Containing 3÷5 wt% Al with Microlaminated Microstructure." Archives of Metallurgy and Materials 62, no. 4 (December 1, 2017): 2309–15. http://dx.doi.org/10.1515/amm-2017-0340.

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AbstractThe aim of this work was to develop basic parameters of hot rolling and controlled cooling technology allowing to obtain the microlaminated (lamellar) microstructure in a lean-alloy structural steel containing 3÷5 wt % Al. Thermo-mechanical rolling tests of two experimental steels were carried out in a semi-industrial line comprising a one – stand reversing rolling mill. The final microstructure of the specimens subjected to rolling in theγ+αstability region characterised with the microlaminated morphology composed of lamellae of ferrite with thickness down to 1 μm or less and lamellae or grains of phases developed during transformation of the austenite. Determined parameters of the thermo-mechanical processing allowed to achieve very attractive mechanical properties of the experimental steels: tensile strength over 1.0 GPa and ductility level (total elongation) better than 15%.

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Ogoltcov, Alexey, Dmitry Sokolov, Semen Sokolov, and Alexander Vasilyev. "Practical Use of Computer Model STAN 2000 for Improvement and Creation of Regimes for Hot Rolling of Steels on SEVERSTAL Mill 2000." Materials Science Forum 879 (November 2016): 2543–48. http://dx.doi.org/10.4028/www.scientific.net/msf.879.2543.

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An integral computer model STAN 2000 designed for of-line simulation and control of hot rolling on mill 2000 of SEVERSTAL was developed. The capabilities of the model include the following features: ‒ calculations of power parameters for all stands of mill 2000 for a given rolling schedule; ‒ strip temperature calculations depending on selected rolling and accelerated cooling regimes; ‒ follow-up of steel microstructure evolution at all stages of strip production and prediction of ultimate mechanical properties (yield stress, ultimate tensile stress, relative elongation and toughness); ‒ optimization of rolling regimes for existing steel grades and developing them for a new one. The STAN 2000 program is written in С++ programming language and can work on all modern Microsoft Windows family operating systems. The program has a well-designed and user-friendly interface facilitating its practical use. The integral model was calibrated using an extensive data base on rolling regimes and forces, measured temperatures and final mechanical properties for a number of steel grades rolled on mill 2000 of SEVERSTAL with chemical compositions covering the following range of alloying elements content (mass.%): С(≤0.65); Mn(≤2.0); Si(≤1.0); Cr(≤0.9); Ni(≤0.6); Cu(≤0.5); Mo(≤0.4); Nb(≤0.05); V(≤0.065); Ti(≤0.06); B(≤0.003). The examples of STAN 2000 program use in practice of industrial hot strip production on mill 2000 of SEVERSTAL are presented and discussed.

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Kong, Ning, Kiet Tieu, Hong Tao Zhu, Qiang Zhu, and Peter Gandy. "Effects of Lubrication in Ferrite Rolling of Interstitial Free Steel." Materials Science Forum 773-774 (November 2013): 186–91. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.186.

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Ferrite rolling of interstitial free steel strip in the temperature range 650-850°C can effectively reduce furnace costs and scale formation as a result of lower strip reheating temperatures. Different lubrication conditions of lubricating oil, solid lubricant and dry condition were used during ferrite rolling tests of thin interstitial free steel strip on a 2-high Hille 100 experimental rolling mill. Different rolling speed, rolling temperature and reductions were applied to the rolling process. The rolling force and roll roughness were affected by the lubrication conditions and rolling parameters. Solid lubricant indicated an improved performance in terms of the roll roughness, as well as the oxidation property of the strip surface during ferrite rolling.

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Pankovets, I. A., S. A. Savchenko, V. I. Voznaya, M. N. Vereshchagin, and I. V. Astapenko. "Study of factors contributing to decrease of carbide heterogeneity in bearing grades of steel." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 77, no. 7 (August 1, 2021): 804–10. http://dx.doi.org/10.32339/0135-5910-2021-7-804-810.

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At present to meet requirement to the quality of bearing steels it is necessary of accomplish estimation of carbide heterogeneity by SEP 1520 and provide the level of carbide network, carbide liquation and streaking, not exceeding adjusted limits, required by customer. To estimate possibility to decrease carbide heterogeneity (segregation), factors influencing its value in the rolling production considered. Description of the process of long products of bearing steels production at the rolling mill 370/150 of the OJSC “BMZ - managing company of the holding “BMK” presented. Possibilities of the existing mill equipment considered for 804 accomplishing of technological operations aimed at decrease of carbide heterogeneity in the finished product. The factors studied, contributing to decrease of carbide heterogeneity under conditions of mill 370/150 operation. To determine the temperature modes effect on the level of carbide heterogeneity in bearing steels, in the process of three campaigns phased decrease of the temperature of end of rolling was accomplished. Results of data analysis obtained at the production of long products profiles of 34-50 diameter of bearing steel grades presented. Conclusion on rolled stock production of bearing steel grades with high requirements to carbide heterogeneity value was formed. It was shown that to obtain high-quality long products it is appropriate to accomplish the heating in the furnace before the rolling no less than 600 min at the temperature in the soaking zone 1150-1220°С followed by application of technology of normalizing rolling and control of temperature of the end of rolling 750°С. For profiles with drawing less 25% it is recommended to accomplish additional heat treatment of the finished profile - normalization. Long time heating of workpieces before the rolling at the temperature 1150-1220°С enables to decrease the carbide heterogeneity down to acceptable level (carbide liquation no more than 3 points and carbide streaking no more than 4 points). The value of carbide network is decreasing at decreasing of temperature of the end of the rolling and increasing deformation value in the last stands. A stable satisfactory result (CN no more than 5.4) was reached at the temperature of the end of rolling 750°С and drawing more than 25%. It was established that the higher the total drawing, the lower the point of carbide network and liquation in the finished profile, which is caused by crushing of nondissolved carbides to separate fragments.

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Megahed, G. M., S. K. Paul, T. A. El-Bitar, and F. Ibrahim. "Development of X60/X70 Line Pipe Steels through EAF-Thin Slab Casting Technology at Ezz Flat Steel, Ain Sukhna, Egypt." Materials Science Forum 500-501 (November 2005): 261–68. http://dx.doi.org/10.4028/www.scientific.net/msf.500-501.261.

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API X60/X70 line pipe steels are characterized by their higher strength and excellent toughness properties, which are achieved through grain refinement by addition of micro-alloying elements and controlled rolling. Thin slab casting of Nb micro-alloyed steel is a great challenge to the steel producer because of possible transverse cracking of slabs. The major casting parameters, which affect transverse cracking, were critically examined and modified for production of defect free slabs. The hot strip mill parameters were also designed for controlled rolling of slabs to achieve the desired mechanical properties. Three heats (one X60 and two X70) of each 175 ton liquid steel were made and processed into 6, 8 and 10 mm hot rolled coils. In the heat of X60, Nb and Ti were used as micro-alloying elements where as vanadium was also added in X70 heats to achieve the desired strength. The YS/UTS ratio was designed to be below 0.9 by controlling the amount of Si and Mn. During slab casting, liquid core reduction (LCR) was used to reduce the slab thickness from 90 to 70 mm and to minimize the center line segregation and porosity. The slabs were heated and homogenized in a tunnel furnace at 1150 ±10°C before rolling in the roughing mill. The rolling procedure was designed to achieve the highest possible amount of deformation at the roughing stand for best conditioning of austenite before rolling in the finishing mill. 50% and 35% reductions in slab thickness were given for rolling of 6 and 10 mm coils respectively. The final thickness reduction was then distributed over 5-6 stands of the finishing mill depending on the coil thickness. All parameters were designed to achieve finish rolling temperature 850 ±10°C in the austenite region and very near to Ar3. After rolling, the steel was fast cooled to 570±10°C before coiling. Mechanical properties and microstructure evolutions were extensively investigated. The tensile properties particularly the elongation and YS/UTS ratio achieved were good. The CVN impact energy in transverse direction was found to be very high ranging from 220 to 330 Joules. Furthermore, the impact transition temperature (ITT) was found to be below -70 °C. The results of the drop weight tear test (DWTT) showed fully ductile behavior up to -40°C confirming the impact test results. SEM study was carried out to assess the fracture mechanism of impact-tested specimens at different temperatures.

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Valenti, Michael. "More from the Mill." Mechanical Engineering 122, no. 10 (October 1, 2000): 82–87. http://dx.doi.org/10.1115/1.2000-oct-5.

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This article focuses on the launch of Sputnik that transfixed the world by Carpenter Technology Corp. By incorporating advanced processing equipment, including a rolling mill, shape controller, annealing furnaces, wet grinders, and leveler with state-of-the-art automated control systems, Carpenter has improved the productivity and quality of its high value strip at a time when Space Shuttle launchings are taken in stride. The Carpenter specialty strip facility installed a cold rolling mill designed by Joseph Frohling GmbH of Olpe, Germany, in November last year, to increase rolling capacity and guarantee that the steel strip it produces meets the desired shape and thickness. In the Frohling mill, strip passes between two working rolls that reduce its thickness to sizes between 0.150 and 0.008 inch, at speeds up to 1500 feet per minute. Carpenter also installed three Ebner vertical annealing furnaces. Coiled strip on mandrels is unwound through each furnace, annealed, then rewound continuously to promote productivity.

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Shinkin, Vladimir N. "Young Modulus at High Temperatures." Solid State Phenomena 299 (January 2020): 535–40. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.535.

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The dependence of the young modulus of metals and alloys on the high temperature must be taken into account in metallurgy in the hot rolling of steel sheet on sheet-rolling mills, hot flattening of steel sheet in the sheet straightening machines, press forming forgings from hot steel sheet, hot volume stamping of metal products, and so on. For example, on the mill 5000 by SMS Siemag, the sheet-rolling of steel strips from the hot slabs at the stand Quarto (the maximum force of 120 MN) occurs at a temperature from 750 °С to 1050 °С, but the pre-flattening of hot steel strip on the five-roller sheet-straightening machine by SMS Siemag occurs usually in the temperature range from 600 °С to 760 °С. In this paper, based on the analysis of experimental data about the dependence of the young modulus for various steel alloys, the analytical dependence of the young modulus on temperature is obtained.

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Radionov, Andrew Alexandrovich, Igor Yuryevich Andryushin, Alexander Sergeevich Karandaev, Vadim Rifhatovich Khramshin, and Rifhat Ramazanovich Khramshin. "Study of the Effect of the Rolling Mill Inter-Stand Tension on the Strip Gauge Deviation." Applied Mechanics and Materials 756 (April 2015): 414–19. http://dx.doi.org/10.4028/www.scientific.net/amm.756.414.

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The paper studies issues of the cross impact of tension and strip gauge at the rolling in the continuous roughing sub-train of the wide strip hot-rolling mill. Functional dependencies and chart of the mathematical model defining interrelation between the specific tension and strip gauge increment are provided. Based on the example of the 2,000 mm hot rolling mill of OJSC Magnitogorsk Iron and Steel Works (OAO MMK), it has been proved that rolling is carried out with tension values which exceed several times allowable values. The paper also considers new technical solutions enhancing the speed mode control algorithms and systems of the electric drives of the wide strip hot-rolling mill continuous subgroup.

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Rezaeian, Ahmad, Faramarz Zarandi, D. Q. Bai, and Steve Yue. "Application of Deformation to Improve Hot Ductility in the Peritectic Steel." Materials Science Forum 500-501 (November 2005): 203–10. http://dx.doi.org/10.4028/www.scientific.net/msf.500-501.203.

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The hot strip rolling of advanced microalloyed high strength steels still represents a new task to many mills due to the lack of data on the hot deformation resistance. With the aid of processing data from the Ispat-Inland hot strip mill, the “measured mean flow stresses” are calculated from the mill force using the Sims analysis and taking into account roll flattening, slip ratio and the redundant strain. A modification of the Misaka mean flow stress equation is proposed for C – Mn – Si – Al steels microalloyed with up to 0.02 % Nb. The effects of alloying and microalloying are then estimated. A new fitting parameter shows excellent agreement with the mean flow stress data from industrial processing of advanced high strength microalloyed steels. However, during the second half of the rolling schedule (lower temperature region), indications of austeniteto- ferrite transformation were found.

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Kurpe, Oleksandr H., Volodymyr V. Kukhar, Eduard S. Klimov, and Andriy H. Prysiazhnyi. "Thermomechanical Controlled Rolling of Hot Coils of Steel Grade S355MC at the Wide-Strip Rolling Mill 1700." Solid State Phenomena 291 (May 2019): 63–71. http://dx.doi.org/10.4028/www.scientific.net/ssp.291.63.

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Тhere has been developed technology, and pilot batch of hot rolling coils (6×1500 mm, steel grade S355MC) has been produced using thermo-mechanical controlled process (TMCP) for the wide-strip rolling mill 1700. The integrated technology for TMCP coil production (steel grade S355MC) has been firstly developed for the rolling mill 1700 in accordance with EN 10149-2. Air cooling for coils to 450°C after coiling has been firstly used in the developed technology, which provides for decrease in air scale and improvement of surface quality for the customers. It is possible to manufacture rolled products up to 6×1500 mm (steel grade S355MC) in accordance with EN 10149-2 using the existing equipment without exceeding the existing process constraints during its operation and without upgrading. It is possible to further master the rolled products, which are manufactured according to the TMCP technology.

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Cianetti, Filippo, Claudio Braccesi, and Maria Cristina Valigi. "Numerical Modelling and Simulation of the Hot Rolling Mill Process." Advanced Engineering Forum 15 (February 2016): 64–74. http://dx.doi.org/10.4028/www.scientific.net/aef.15.64.

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In the design of the rolling mill plants, it is fundamental to study the behaviour of the deformation process to assess the main process variables (such as torque and rolling force) in all operating conditions.In this paper, a finite element model is developed and the numerical simulations of the plastic deformation process, in the hot rolling mill of AISI 304 stainless steel, are shown. In the proposed model a Multilinear Isotropic Hardening behaviour of material has been assumed and true stress-true strain curves have been found, taking into account temperature and strain rate. Numerical results are compared with experimental measures regarding an existing hot rolling mill plant.

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Wang, Bao Yuan, Jiang Bo Dai, Ye Hua Zhang, and Da Qing Xu. "Research on Finite Element Simulation of the Big Size Spring Steel in Continuous Grooveless Rolling." Advanced Materials Research 941-944 (June 2014): 1859–64. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.1859.

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T he basis of the rolling process parameters of large size spring steel for the simulation calculation ,t he fini te element model was establishe . the calculation results reveal the reasons about the billet heap and the l ow precision products , the rolling program file about continuous rolling pass and technology of the rolling mill was revised and perfect ed , the continuity and stability of the large size spring flat steel in continuous slotless roughing rolling is improved greatly, and t he unit operation efficiency increased .

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Kawulok, Petr, Radek Jurča, Ivo Schindler, Stanislav Rusz, Rostislav Turoň, Petr Opěla, and Rostislav Kawulok. "Laboratory Controlled Rolling of Microalloyed Steel for Production of Seamless Tubes." Solid State Phenomena 258 (December 2016): 611–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.611.

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Using the laboratory rolling mill with smooth rolls, piercing, as well as rolling in a pilger mill of the seamless tubes with diameter 273 mm from the HSLA steel microalloyed with vanadium steel was simulated. Influence of the wall thickness (6.3 – 40 mm) and finish rolling temperature on the final structural and mechanical properties was investigated. Necessary temperatures of the phase transformations in the course of cooling were determined by dilatometric tests. Based on the dilatometry results, finish rolling temperatures were reduced. Lower rolling temperatures yielded in a relative grain refinement. Effect of the finish rolling temperature did not have any marked impact on the tensile tests results. Strength properties decreased only slightly with the increasing wall thickness and the plastic properties were not influenced significantly by this parameter. The positive effect of the reduced finishing temperature appeared markedly in the results of impact tests performed at room temperature only. Notch toughness was increased by approx. 25 % in the case of the wall thickness of not less than 20 mm.

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Wang, Jian Chen, and Xiao Lei Deng. "The Design of Rolling Mills’ Automatic Control System Based on PLC." Key Engineering Materials 546 (March 2013): 25–29. http://dx.doi.org/10.4028/www.scientific.net/kem.546.25.

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The rolling mill is a kind of mechanical equipment which rolls steel ingot or billet continuously into steel. This paper selected 1150 blooming mill as research subject. In order to realize the automatic control of 1150 blooming mill, hydraulic screw-down devices and the automatic control system of hydraulic screw-down position are used, and Siemens PLC is chose as the control system's main control unit. Then industrial control technologies are used, such as DC digital controller, touch screen, photoelectric-interrupter type position sensor.

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Jiao, Zhi Jie, Hao Zhang, Jing Wang, Chui Hong Liu, and Xiang Hua Liu. "Precise Rolling Force Calculation for the Tandem Cold Mill." Materials Science Forum 561-565 (October 2007): 1883–86. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1883.

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Rolling force is the most important technical parameter for the tandem cold mill. In this paper, the precise models and calculation process for the rolling force are introduced. The rolling force model is based on the Bland-Ford and Hill theory, and the roll flatten radius is calculated with the Hitchcok’s formula. The deformation resistance of the strip is calculated with the model, whose parameters are decided according to the steel grade. The friction coefficient model is built according to rolling speed and rolled length of the roll. The rolling force and the roll flatten radius are calculated with the iterative method. These models are used for online process control of one five-stand tandem cold mill. Comparing the calculation result and the actual data, the precision of the rolling force calculation is high.

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Shiryaeva, E. N., M. A. Polyakov, and D. V. Terent'ev. "Analysis of interconnections between technical systems on hierarchically connected technological levels of steel sheet production by hot rolling." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 76, no. 8 (September 3, 2020): 847–55. http://dx.doi.org/10.32339/0135-5910-2020-8-847-855.

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Complexity of modern metallurgical plants, presence of great number of horizontal and vertical interactions between their various structural subdivisions makes it necessary to apply a systems analysis to elaborate effective measures for stable development of a plant operation. Among such measures, digitalization of a plant is widespread at present. To implement the digitalization it is necessary to have clear vision about links at all the levels of the technological system of a plant. A terminology quoted, accepted in the existing regulatory documents for defining of conceptions, comprising the technological system. It was shown, that the following four hierarchical levels of technological systems are distinguished: technological systems of operations, technological systems of processes, technological systems of production subdivisions and technological systems of plants. A hierarchical scheme of technological systems of hot-rolled sheet production at an integrated steel plant presented. Existing horizontal and vertical links between the basic plant’s shops shown. Peculiarities of flows of material, energy and information at the operation “rolling” of the technological system “hot rolling of a steel sheet” considered. As a technical system of the technological process of the hot rolling, the hot rolling mill was chosen. A structural diagram of the hot rolling mill was elaborated, the mill being consisted of reheating furnaces, roughing and finishing stand groups, with an intermediate roll-table between them, and down-coilers section. Since the rolling stands are the basic structural elements of the hot rolling mill, structural diagrams of a roughing and a finishing stands were elaborated. Results of the systems analysis of the technological and technical systems, hierarchically linked in the process of steel sheet hot rolling, can be applied for perfection of organization structure of the whole plant, as well as for elaboration mathematical models of a system separate elements functioning, which is a necessary condition for a plant digitalization.

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Jiao, Zhi Jie, Chun Yu He, Jian Ping Li, and Xiang Hua Liu. "Thickness Indirect Measurement Method for Direct Pulling Pilot Cold Rolling Mill." Advanced Materials Research 189-193 (February 2011): 2670–74. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2670.

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Pilot cold rolling mill is the important tool for the cold rolling process researching and new steel grade development. According to the design of the new type direct pulling pilot cold rolling mill, based on the mass flow constant principle, strip exit thickness indirect measurement method is studied. During rolling, strip entry and exit speed can be calculated accurately according to the measured value of two sides’ clamps movement. Data filtering treatment is adopted and program flow chart is designed. Based on the material entry thickness measured manually, exit thickness of all passes can be measured indirectly. This thickness indirect measurement method has been applied successfully on the new type pilot cold rolling mill, and the measurement results show that this method has a good accuracy.

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Snitko, S. A., A. V. Yakovchenko, V. V. Pilipenko, and N. I. Ivleva. "Modeling of ring billets rolling on radial-axial ring-rolling mill." Izvestiya. Ferrous Metallurgy 63, no. 8 (October 8, 2020): 665–73. http://dx.doi.org/10.17073/0368-0797-2020-8-665-673.

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On the basis of radial-axial rolling of ring billets, resource-saving technologies for metal forming have been created. Determining the rational parameters of this process is the actual scientific and technical task at development of new profiles. The method of three-dimensional finite element modeling is the most effective tool for improving the technological conditions of ring rolling process. However, as practice has shown, the finite element modeling method requires adaptation to each process of metal forming. This is the subject of the present work. The expediency of using dependency for calculating the metal flow stress for finite-element modeling of ring-rolling processes is substantiated. This dependence was developed on the basis of a theory that takes into account the chemical composition of structural carbon steel, its temperature, strain rate, accumulated deformation, and also the processes of dynamic transformation of the metal structure during hot rolling. A computer program for automated determination of dependency parameters has been developed. The analysis of the accuracy of the obtained dependence was performed in relation to the experimental data. In the course of these calculations, the method of automated determination of the metal flow stress was used by spline interpolation of the experimental data included in the computer database of digital information for a particular steel grade. The average relative error of calculated values of the metal flow stress was 8 % relative to the experimental ones. An improved method is proposed for calculating the parameters of ring billets rolling and reaching the required growth rate of the ring diameter implemented in a finite element modeling system, which is similar to the way the control system of the ring-rolling mill works in solving the same problem (reaching the required growth rate of the ring diameter) when implemented appropriate rolling in practice. When calculating the size of the compression, the iterative process and the method of half division were used. The average deviations of calculated values of the parameters of ring billets rolling from the experimental did not exceed 12.4 %, which makes it possible to apply the proposed approach to study the patterns of the rings rolling process and to improve the rolling technology.

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Choi, Miseon, and Hyunseok Lee. "Study on the pack rolling process factor of Ti-6Al-4V alloy." MATEC Web of Conferences 321 (2020): 11088. http://dx.doi.org/10.1051/matecconf/202032111088.

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Pack rolling method is preferred to conventional rolling method to process thin sheets or foils out of titanium alloys because of their relatively narrow processing window and possible surface contamination during the elevated temperature processing. In this paper, the core sheets of 5mm thick with equiaxed alpha + transformed beta structure were encapsulated in mild steel cover material and hot rolled in a four high reversing hot rolling mill. The following results were obtained; The optimal pack assembly condition and pack rolling process factor were produced. The effect that the difference in deformation resistance of cover material and core material in pack rolling has been considered. The S45C mild steel is the most suitable for the cover material. The cover material is subjected to the same rolling process as the core material when the initial core and total thickness ratio is 0.3. The reduction in pack rolling should be selected in the range of 20% to 25% to produce flat sheet. Tensile properties of the pack rolled sheet are isotropic in both RD and TD rolling direction which meet the requirements of the standard AMS4911.

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Journal articles on the topic 'Steel rolling mill'

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