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Metal Science and Metallography
Название Development of rolling procedures for pipes of K55 strength class at the laboratorial mill
DOI 10.17580/cisisr.2022.02.09
Автор R. R. Adigamov, K. A. Baraboshkin, P. A. Mishnev, A. I. Karlina
Информация об авторе

Severstal management JSC (Cherepovets, Russia):

R. R. Adigamov, Head of the Dept., e-mail: rradigamov@severstal.com
K. A. Baraboshkin, Leading Expert (Supervisor), e-mail: ka.baraboshkin@severstal.com
P. A. Mishnev, Director on Technical Development and Quality, e-mail: pamishnev@severstal.com
A. I. Karlina, Cand. Eng., Leading Expert, e-mail: ai.karlina@severstal.com

T. S. Varkhaleva, Leading Expert of Severstal Management JSC also participated in this research.


Experimental results of physical simulation of the manufacturing technology of coiled rolled strip for pipes of K55 strength class (API SCT) at the laboratorial mill are presented. This manufacturing process includes hot rolling with accelerated cooling and coiling at high temperature. Melting of 4 laboratorial melts of K55 steel was conducted. Mechanical properties of pilot strips were examined. Investigation of microstructure via the methods of optical and scanning electronic microscopy was conducted. All samples have ferrite-pearlite microstructure which corresponded to the aimed microstructure. It was noted that molten metal without vanadium is more susceptible to forming of undesirable products of intermediate transformation stage. Recommendations on chemical composition and manufacturing technology of K55 steel on 2000 rolling mill are developed. Steel has the following aimed chemical composition for the main elements: 0.32 % C; 0.5 % Si; 1.05 % Mn; 0.05 % V. The following main technological parameters were recommended: heating up to 1240-1260 ºC; temperature after 5th stand 1060-1100 ºC; thickness of rolled semiproduct 30-40 mm; temperature before 6th stand 950-970 ºC; finishing rolling temperature 830-870 ºC; temperature in the 1st coiling group 650-680 ºC; coiling temperature 620-640 ºC.

Ключевые слова Flat rolled products, pipe steel, bainite, pearlite, ferrite, pipes, rolled products, Severstal
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Полный текст статьи Development of rolling procedures for pipes of K55 strength class at the laboratorial mill