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Production of Heavy Plates of Pipe Steel with Increased Strength and Cold Resistance on the 5000 Rolling Mill at PJSC MMK

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Abstract—On the basis of laboratory experiments on an ITs Termodeform-MGTU test system, the production of rolled plates with large thickness from pipe steel of improved strength (Rt 0.5 = 505–610 MPa, Rm = 570–680 MPa) and cold resistance (KV–48 ≥ 170 J, DWTT–55 ≥ 90%) is introduced in the 5000 rolling mill at PJSC MMK. To ensure high cold resistance, the formation of predominantly quasi-polygonal and polygonal (polyhedral) ferrite is optimal. It is found that, if the steel microstructure includes a considerable quantity of bainite, the performance of the steel in drop tests is impaired. By means of the Gleeble 3500 test system, the thermokinetic diagram of supercooled-austenite decomposition is plotted for the new low-carbon pipe steel, with up to 1% Ni.

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ACKNOWLEDGMENTS

Financial support was provided by the Russian Ministry of Education and Science to encourage university participation in the development of high-tech production (contract 03.G25.31.0235).

We thank D.Yu. Alekseev, M.V. Mishukov, M.V. Mal’kov, A.N. Shishlonova, D.M. Chukin, and A.S. Ishimov for their assistance in this research.

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Authors and Affiliations

  1. PJSC MMK, Magnitogorsk, Russia

    S. V. Denisov & P. A. Stekanov

  2. Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

    P. P. Poletskov, M. S. Gushchina & O. A. Nikitenko

Authors
  1. S. V. Denisov
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  2. P. A. Stekanov
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  3. P. P. Poletskov
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  4. M. S. Gushchina
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  5. O. A. Nikitenko
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Corresponding author

Correspondence to M. S. Gushchina.

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Translated by Bernard Gilbert

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Denisov, S.V., Stekanov, P.A., Poletskov, P.P. et al. Production of Heavy Plates of Pipe Steel with Increased Strength and Cold Resistance on the 5000 Rolling Mill at PJSC MMK. Steel Transl. 49, 271–276 (2019). https://doi.org/10.3103/S0967091219040053

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  • DOI: https://doi.org/10.3103/S0967091219040053

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