Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

V. M. Kolokoltsev, Dr. Eng., Prof., President of the University, e-mail: kwm@magtu.ru
N. A. Feoktistov, Cand. Eng., Associate Prof., Head of the Dept. of Casting Processes and Materials Science, e-mail: fna87@mail.ru
A. S. Savinov, Dr. Eng., Prof., Director of the Institute of Metallurgy, Machine-building and Material Processing, e-mail: savinov_nis@mail.ru
E. V. Skripkin, Magister Student

The paper presents the results of the complex scientific and research work directed on development of the new composition of sHSS steel for rolling mill rolls together with Magnito-gorsk Iron and Steel Works (MMK) and Magnitogorsk Mill Rolls Plant (MZPV). The first part includes the review of technical literature in the field of the results of roll steel examination by domestic and foreign researchers, investigation of structure and determination of properties of foreign rolling rolls, which were operated at the MMK hot rolling mill. The minimal level od sHSS steel properties for the working layer of a rolling roll, providing its operation reliability, is also determined. Laboratorial experiments were conducted at the second stage. The formed massif of ex-perimental data was processed using neural net, and as a result, the optimal chemical composition of the roll steel with high wear resistance and hardness was obtained. After processing of the re-sults of the planned experiment, the regression equation was obtained; it describes influence of the alloy chemical composition on wear resistance and hardness coefficients. Optimized composition of the alloy was developed at Magnitogorsk Mill Rolls Plant; it wad resulted in manufacture of the pilot roll sleeve in centrifugal machine. This roll sleeve was subjected to heat treatment according to the standard plant procedure. The final step included laboratorial testing of the pilot roll sleeve which was manufac-tured from steel with optimized chemical composition. It was determined that the developed composition is characterized by wear resistance increased by 27 % in comparison with the re-searched foreign analogue, as well as by similar qualitative parameters of the alloy microstructure.

1. Lecompe-Becker J., Chu-Fang Chiundzhan J., Pirard E. et al. Development of new high-speed steel with optimized carbide composition for rolls. Stal. 2003. No. 2. pp. 88-92.
2. Steimer D., Uijtdebroeks H., Liquet D. et al. Development of HSS roll in hot strip mill of Cockerill Sambre. Inernational Conference on Newly Developed Metallurgical Process Technology, Dusseldorf, 1999. pp. 269-277.
3. Gulakov A. A., Tukhvatullin I. Kh., Potapov M. G. Experience of production of centrifugal cast sheet rolling rolls for hot rolling mills in the conditions of Kushvinsky Mill Roll Plant. Chernaya metallurgiya. Bulleten nauchno-tekhnichesloy i ekonomicheskoy informatsii. 2018. No. 5. pp. 75-81.
4. Gimaletdinov R. Kh., Gulakov A. A., Tukhvatullin I. Kh. Influence of chemical composition on properties of the working layer of centrifugal cast indefinite rolling rolls. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2016. Vol. 14. No. 3. pp. 78-89.
5. Deng G. Y., Zhu H. T., Tieu A.K., Su L.H., Reid M. Theoretical and experimental investigation of thermal and oxidation behaviours of a high speed steel work roll during hot rolling. International Journal of Mechanical Sciences. 2017. August 12. pp. 811–826.
6. Deng G. Y., Zhu Q., Tieu K., Zhu H.T., Reid M. et al. Evolution of microstructure, temperature and stress in a high speed steel work roll during hot rolling: Experiment and modeling. Journal of Materials Processing Technology. 2017. Vol. 240. pp. 200–208.
7. Jing Guo, Bo Liao, Li-Gang Liu, Qiang Li, Xen-Jun Ren, Qing-Xiang Yang. Forging limit of a novel high-speed-steel cold work roll based on ductile fracture criteria by finite element model. Materials and Design. 2013. Vol. 52. pp. 1027–1034.
8. Deng G. Y., Tieu A.K., Su L.H., Zhu H. T., Reid M., Zhu Q. Characterizing deformation behaviour of an oxidized high speed steel: Effects of nanoindentation depth, friction and oxide scale porosity. International Journal of Mechanical Sciences. 2019. Vol. 155. May. pp. 267-285.
9. Vdovin K. N., Feoktistov N. A., Gorlenko D. A., Mikhalkina I. V. et al. Simulation of crystallization and structure forming processes for rolling roll from hyper-eutectoid steel. Teoriya i tekhnologiya metallurgicheskogo proizvodstva. 2020. No. 1 (32). pp. 18–25.
10. Feoktistov N. A., Chernov V. P., Savinov A. S. et al. Evaluation of carbon influence on operating properties and microstructure of a roll steel. Izvestiya Volgogradskogo gosudarstvennogo tekhnicheskogo universiteta. 2021. No. 7 (254). pp. 35-40.
11. Feoktistov N. A.,Vdovin K. N., Savinov A. S., Skripkin E. V. Study of cast structure forming process for roll steel. Izvestiya Volgogradskogo gosudarstvennogo tekhnicheskogo universiteta. 2020. No. 7 (242). pp. 36-40.
12. Parsunkin B. N., Bushmanova M. V., Andreev S. M. et al. Statistical research and simulation of economical and technological metallurgical processes. Magnitogorsk: Izdatelstvo Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta, 2007. 315 p.
13. Parsunkin B. N., Bushmanova M. V., Andreev S. M. Calculation of the automatic optimization systems for management on technological processes in metallurgy. Magnitogorsk: Izdatelstvo Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta, 2003. 267 p.
14. Boccalini M. (Jr.), Sinatora A. Microstructure And Wear Resistance of High Speed Steels For Rolling Mill Rolls. 6^th International tooling conference, 2013. рр. 509-524.
15. Denisova A. V., Dadykin S. Yu. Possibilities of neural nets use in analysis and simulation of production systems. Proceedings of the II All-Russian scientific-technical conference “Prospective scientific developments” (PNR-2020). 2020. рр. 37-38.