“Severstal” (Cherepovets, Russia):

Kolobov A. V., Cand. Eng., Senior Manager

“Severstal TPZ-Sheksna” LLC (Cherepovets, Russia):
Fedotov E. S., Manager for Technology and Quality

National University of Science and Technology “Moscow Institute of Steel and Alloys” (MISiS) (Moscow, Russia):
Lisunets N. L., Cand. Eng., Assist. Prof. of the Chair “Technology and Equipment of Tubemaking”, lisunets@yandex.ru
Radyuk A. G., Dr. Eng., Leading Research Fellow of the Chair “Technology and Equipment of Tubemaking”

Cherepovets State University — Federal State Budgetary Educational Institution of Higher Professional Education (FSBEI HPO) (Cherepovets, Russia):
Vinogradov A. I., Cand. Eng., Assist. Prof. of the Chair “Machines and Units of Metallurgical Works”

At present time, multi-disk shears mounted in the coil slitting lines (CSL) are used for slitting of coiled steel in manufacture of electric welded tubes of small and medium diameter from tube strip billet. In the conditions of wide strip dimension and steel grade range production, transition from one tube strip size to another with varying of steel grades and its mechanical properties is connected with additional adjusting of technological process parameters for providing the required quality. It is possible to manage the process on the base of the developed generalized model that is built on the results of statistical processing of the passive production experiment and allows to adjust parameters of equipment. Mathematical models of the process of slitting of coiled strip at the coil slitting lines using “Statistika” program have been built based on the results of processing of experimental data as regression equations for the following controlled parameters: gap between shears, overlapping of shears, strip speed, specific tension at uncoiler; it allows to improve line adjusting for fabrication of billets with other dimensions. Recommendations for minimizing of trapezium value and cutting angle are given; they can be used in slitting of coiled strip at the coil slitting lines. These recommendations have been tested in slitting of coiled steel to tube strip billets of 10ХСНД (10KhSND) steel for Tikhvinsky freight car building plant and can be used as generalized model of the process of slitting of coiled steel at multi-disk shears during different production and adjusting stages at coil slitting lines.

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