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.

1. Peiganovich N. V. Production of oil and gas pipeline tubes with increased operation reliability.. 2007. No. 12. pp. 51-55.
2. Shabalov I. P., Morozov Yu. D., Efron L. I. Steels for pipes and building constructions with increased operation properties. Moscow : Metallurgizdat. 2003. 520 p.
3. Matrosov Yu. I., Litvinenko D. A., Golovanenko S. A. Steel for main gas pipelines. Moscow : Metallurgiya. 1989. 288 p.
4. Zikeev V. N., Kharchevnikov V. P., Filatov N. V., Anuchin K. V. New structural steels for gas and oil pipeline tubes which are produced via high frequency resistance welding and are characterized by increased strength, cold resistance and resistance to hydrogen sulfide cracking. Problemy chernoi metallurgii i materialovedeniya. 2008. No. 3. pp. 12-17.
5. Naumenko V. V., Bagmet O. A., Muntin A. V., Soldatov E. A., Matrosov M. Y., Kichkina A. A. Study of the effect of microalloying on microstructure and mechanical property formation for rolled product of strength class K52 produced under cru conditions. Metallurgist. 2020. Vol. 64. No. 7-8. pp. 759-769.
6. Barykov A. M., Stepanov P. P., Il’inskii V. I., Golovin S. V., Chervonnyi A. V., Éfron L. I., Bagmet O. A., Matrosov M. Y. Development of rolled product manufacturing technology for pipes with high deformation capacity. Metallurgist. 2020. Vol. 63. No. 11-12. pp. 1204-1219.
7. Kazakov A. A., Zhitenev A. I. Assessment and interpretation of nonmetallic inclusions in steel. CIS Iron and Steel Review. 2018. Vol. 16. pp. 33–38.
8. Shokeir Z., Besson J., Belhadj Ch., Petit T., Madi Ya. Edge tracing technique to study post-necking behavior and failure in Al alloys and anisotropic plasticity in line pipe steels. Fatigue and Fracture of Engineering Materials and Structures. 2022. Vol. 45 (9). pp. 2427-2442.
9. Tu S., Ren X., He J., Zhang Z. Stress–strain curves of metallic materials and post-necking strain hardening characterization: A review. Fatigue and Fracture of Engineering Materials and Structures. 2020. Vol. 43 (1). pp. 3-19.
10. Versaillot P. D., Zhao Z.-L., Wu Y.-F. A new theoretical method for predicting the elastoplastic behavior of ductile metallic materials. International Journal of Mechanical Sciences. 2021, Vol. 200. Art. No. 106450.
11. Efron L. I. Metal science in the “large” metallurgy. Pipe steels. Moscow : Metallurgizdat. 2012. 696 p.
12. Shinkin V. N. Tube billet’s shaping on the pre-shaping press by means of punch with flat bottom. CIS Iron and Steel Review. 2021. Vol. 21. pp. 47–51.
13. Talanov O. P., Matrosov M. Yu., Lyasotskiy I. V. Variation of structure and mechanical properties of high-strength pipe steels with bainite structure as a result of additional heat treatment. Problemy chernoi metallurgii i materialovedeniya. 2011. No. 1. pp. 77-84.
14. Belyi A. P., Isaev O. B., Matrosov Yu. I., Nosochenko A. O. Central segregation heterogeneity in continuously cast sheet billets and rolled heavy plates. Moscow : Metallurgizdat. 2005. 136 p.
15. Grimpe F., Meuser H., Gerdemann F., Muthmann E., Mannesmann S. Improvement of Mechanical Properties of Heavy Plates for High Strength Pipeline Application i.e. in Arctic Regions. 2^nd International Conference on Super-High Strength Steels. 2010. pp. 17-20.
16. Hillenbrand H.-G., Kalwa C., Schröder J., Kassel C. Challenges to a Pipe Manufacturer Driven by Worldwide Pipe Projects. 18^th Joint Technical Meeting on Pipeline Research. 2011. Vol. 13. pp. 1-12.
17. Annealing of welded seam in API pipes manufactured via high frequency resistance welding. Novosti chernoy metallurgii za rubezhom. 2006. No. 6. pp. 52-54.
18. Zikeev V. N., Alistaev A. N., Peiganovich N. V., Peiganovich I. V., Efron L. I. Development of steel chemical composition and heat treatment for electrowelded casings with increased strength and cold resistance. Metallurgist. 2016. Vol. 59. No. 11-12. pp. 1106-1110.
19. Kolbasnikov N. G., Mishin V. V., Shishov I. A., Matveev M. A., Korchagin A. M. Surface-crack formation in the manufacture of microalloyed steel pipe. Steel in Translation. 2016. Vol. 46 (9). pp. 665–670.
20. Kolbasnikov N. G., Matveev M. A., Mishnev P. A. Effect of structure factor on high-temperature ductility of pipe steels. Metal Science and Heat Treatment. 2016., Vol. 58 (1). pp. 51–57.
21. Komissarov A. A., Sokolov P. Y., Tikhonov S. M., Sidorova E. P., Kuznetsov D. V., Mishnev P. A., Matrosov M. Y. Production of low-carbon steel sheet for oil-industry pipe. Steel in Translation. 2018. Vol. 48 (11). pp. 748–753.
22. Adigamov R. R., Baraboshkin K. A., Yusupov V. S. Study of kinetics of phase transformations during experimental melting of rolled coils of K55 strength class for pipes. Stal. 2022. No. 11. pp. 40-46.