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Rolling and Metal Forming
ArticleName Improvement of the slitting process for rebar rolling to increase the material yield and rolling mill 370 utilization at PJSC “MMK”
DOI 10.17580/cisisr.2018.01.04
ArticleAuthor S. A. Levandovsky, O. N. Tulupov, A. B. Moller, D. I. Kinzin

Nosov Magnitogorsk state technical university (Magnitogorsk, Russia):

S. A. Levandovsky, Cand. Eng., Associate Prof., Chair “Materials treatment technologies”, e-mail:
O. N. Tulupov, Dr. Eng., Prof., Chair “Materials treatment technologies”, vice-rector for research and innovations,
A. B. Moller, Dr. Eng., Prof., Head of the chair “Materials treatment technologies”
D. I. Kinzin, Cand. Eng., Associate Prof., Chair “Materials treatment technologies”


The aim is to increase the stability of the MMK’s mill 370 performance, and improve the material yield. We reviewed and analyzed the world experience in the rebar production using the slitting-process. There are two approaches to the slitting: by dividing a thick neck in the grooves of the working stand of the mill; by dividing a thin neck in the exit slitting guide after the stand. The reasons of downtimes of the mill 370 PJSC “MMK” during the production of rebars No. 10–14 by slitting were analyzed. A significant part of cobbles (sticking or choking) occurred at the stand 16. Technical and technological solutions have been developed to ensure stable rolling and an increase of the yield, in particular: an adjusted roll pass design for the stand 14; a proposal to improve the implementation schemes of slitting process using Danieli slitting guides; suggested the use of wear-resistant dividing rollers from TiC or WC; recommended to use higher quality bearings for dividing guide roller with elastic sealing devices capable to operate at elevated temperatures. Trial rolling was carried out using wear-resistant dividing rollers and the correct groove of the stand 14. As a result, the share of cobbles reduced significantly and the material yield improved. The share of the cobbles per ton during the experimental rolling almost halved (0.16%) compared to the average level of 0.34%. The measurements showed that the rolled material obtained after the 15th stand has the correct dimensions and sufficient symmetry.

keywords Rebars, slitting rolling process, dividing rollers, dividing roller guides, long products production, material yield, wear resistance, trial rolling, 370 rolling mill, tungsten carbide, titanium carbide

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Full content Improvement of the slitting process for rebar rolling to increase the material yield and rolling mill 370 utilization at PJSC “MMK”