National University of Science and Technology MISIS, Moscow, Russia

A. S. Aleshchenko, Cand. Eng., Associate Prof., Head of the Dept. of Metal Forming, e-mail: aleschenko.as@misis.ru
S. P. Galkin, Dr. Eng., Prof., Dept. of Metal Forming, e-mail: glk-omd@yandex.ru
Yu. V. Gamin, Cand. Eng., Associate Prof., Dept. of Metal Forming, e-mail: y.gamin@mail.ru
M. V. Kadach, Head of Laboratory, e-mail: kadach.mv@misis.ru

National University of Science and Technology MISIS, Moscow, Russia¹ ; JSC Pervouralsk New Pipe Plant, Pervouralsk, Russia²

R. V. Iskhakov, Postgraduate Student, Dept. of Metal Forming¹, Leading Engineer-Technologist², e-mail: ruslan.iskhakov@tmk-group.com

A set of research, development, design and implementation works was carried out to create a technology and a specially designed radial-shear rolling (RSR) stand for preliminary reduction of continuously cast billets in the conditions of the operating Tube Rolling Mill 160 of JSC Pervouralsk New Pipe Plant. Pre-project research work was carried out, during which a pilot batch of billets with a diameter of 150–156 mm from 12Kh1MF, 18KhMFB and 18Kh3MFB steels was rolled on the RSR stand to a diameter of 90 and 105 mm. Comparative analysis of the microstructure of the original continuously cast billets (CCB) and bars after hot deformation showed that RSR allows for intensive refinement of the CCB structure and, at drawing ratios of 2.0–3.0, ensures high-quality processing of the cast structure by 70–90 %. The design of the stand was developed in terms of permissible forces, strength, and the possibility of installation in the line of the existing Tube Rolling Mill 160. The use of a specialized RSR stand at feed angles of 18 degrees for preliminary deformation of CCB made it possible to increase the reduction to 45 %, the drawing ratio to 3.0–3.3, and to roll CCB with a diameter of 156 mm from alloyed chromium-containing steels to a diameter of 90–95 mm in one pass.

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