Lipetsk State Technical University (Lipetsk, Russia):

A. V. Polyakov, Post-Graduate Student, Metal Forming Dept., e-mail: Pool_Akov@mail.ru
R. Shatshu Netshutzim, Post-Graduate Student, Metal Forming Dept.
I. P. Mazur, Dr. Eng., Prof., Head of Metal Forming Dept., e-mail: mazur@stu.lipetsk.ru

When alternating reduction in vertical and horizontal rolls, occurring in a roughing group of continuous wide-strip hot rolling mills, the metal transitions from the lateral edges and ribs of a slab to horizontal surfaces of the hot-rolled breakdown. In this case, the metal in the edge region is shifted to the longitudinal axis of the hot-rolled breakdown. The magnitude of the metal movement, and with them the edge defects formed on the continuously cast slab, on the horizontal surfaces of the hot-rolled breakdown directly a affects the value of the side trim in subsequent technological operations. In previous papers, recommendations were made for adjusting the compression modes of slabs with edge cracks, cast at continuous steel casting plants, when rolling in the draft group of continuous broadband hot rolling mills. In this paper, the results of comparing the modes that take into account the developed recommendations and the applied modes are considered. The joint effect of the developed recommendations on the amount of metal displacement from the lateral edges of the slab to the longitudinal axis of the roll is determined. The influence of the critical point of the edge influx on the amount of metal displacement from the edge of the strip is studied. The technical effect of implementing the developed recommendations on a continuous broadband hot rolling mill is evaluated. The studies were carried out using a computer model of slab deformation in three universal free-standing stands. The model is based on the finite element method and is implemented in the SIMULIA ABAQUS software package.

1. Polyakov А. V., Shatshu Netshunzim R., Mazur I. P. Influence of technological parameters of rolling in universal stands on the process of metal displacement from the edges to the longitudinal axis of the roll. Part 1. Technological parameteres. Chernye Metally. 2020. No. 8. pp. 20–24.
2. Pimenov V. А., Shamrin А. V. Polyakov А. V. Маzur I. P. Contouring of vertical rolls in the stand No.1 of the 2000 hot rolling mill at Novolipetsk steel works in order to reduce the edged defect «deformed crack». Chernye Metally. 2018. No. 11. pp. 17–21.
3. Bolobanova N. L., Garber E. G. Study and modeling of the deformation process of the slab in the 2000 mill roughing group. Metallurg. 2021. No. 5. pp. 71–75.
4. Salganik V. М., Pesin А. М., Pustovoytov D. О. Modeling of the behavior of transverse corner cracks in a slab when rolling in horizontal rolls. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2010. No. 3. pp. 22–24.
5. Kainz A., Ilie S., Parteder E., Zeman K. From slab corner cracks to edge-defects in hot rolled strip – experimental and numerical investigations. Steel Research International. 2008. Vol. 79. Iss. 11. pp. 861–867.
6. Liu X., Yu H., Li C., Zhao H. Behaviour of corner surface cracks in V-H rolling process of steel slabs. Paper presented at the 9^th International Steel Rolling Conference 2006. p. 204.
7. Dema R. R., Latypov О. R., Kalugina О. B., Koldin А. V. Computer and mathematical modeling of the hot rolling process using lubricants in the DEFORM-3D software package. Message 1. Physical and computer modeling of the hot rolling process with lubricants on the SMTs-1 friction machine. Proizvodstvo prokata. 2019. No. 8. pp. 21–28.
8. Ogarkov N. N., Platov S. I., Urtsev V. N. et. al. Study of the movement of scale fragments during deformation of protrusions and depressions with and without the formation of a “rolled scale” defect. Proizvodstvo prokata. 2018. No. 3. pp. 15–21.
9. Gugis N. N. Development of the rolling production of the Russian Federation in 2013-2014. Proceedings of the 10^th Congress of Rollermen. Vol. 1. Lipetsk: Obyedinenie prokatchikov, 2015. pp. 4–14.
10. Lisunets N. L. Improvement of the efficiency of manufacturing processes for semi-finished products and billets from rolled metal products. Proceedings of the 10^th Congress of Rollermen. Vol. 1. Lipetsk: Obyedinenie prokatchikov. 2015. pp. 305–308.
11. Solovieva А. V., Yashalova N. N. The need for digitalization of the iron and steel industry. Ninth International Scientific and Practical Conference “Modern Trends and Innovations in Science and Industry”. Mezhdurechensk: KuzGTU, 2015. pp. 271–275.
12. Voronon D. S., Erypalov S. E., Pridvizhkin S. V. et al. Assessment of competitiveness of the leading Russian metallurgical enterprises. Journal of Applied Economic Sciences. 2017. No. 1. pp. 36–38.
13. Boqiang L., Mengmeng X. Regional differences on CO₂ emission efficiency in metallurgical industry of China. Energy Policy. 2018. No. 120. pp. 302–311.
14. Iles L. The role of metallurgy in transforming global forests. Journal of Archaeological Method and Theory. 2016. No. 23. pp. 1216–1241.
15. Jean-Pierre Birat. Steel cleanliness and environmental metallurgy. Metallurgical. Research and Technology. 2016. No. 113. pp. 1–24.