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Inorganic Materials: Applied Research

, Volume 10, Issue 6, pp 1282–1300 | Cite as

Scientific and Technological Bases for Developing Cold-Resistant Steel with a Guaranteed Yield Strength of 315–750 MPa for Arctic Conditions: Part 2. Manufacturing Technology, Structure, Properties, and Serviceability of Sheet Products

  • O. V. SychEmail author
METAL SCIENCES. METALLURGY

Abstract—The paper presents results of the industrial implementation of hot plastic deformation and thermal treatment schemes for the production of rolled sheet products based on cold-resistant steel with yield strength not lower that 315–750 MPa for the Arctic. On the basis of the studies performed, a set of scientific and technological techniques has been developed for various technological processes (thermomechanical treatment followed by accelerated cooling, quenching from the rolling heating, and separate furnace heating with high-temperature tempering). The developed complex method provides the formation of a structure having an acceptable heterogeneity and anisotropy level corresponding to different morphological and crystallographic parameters throughout the entire thickness of rolled products up to 100 mm based on low-alloy steels with a yield strength not lower than 315–460 MPa and up to 60 mm based on economically alloyed steels with a yield strength not lower than 500–750 MPa. The structure of sheet products is presented that provides guaranteed characteristics of strength, cold resistance (impact energy KV at a testing temperature ranging from –60 to –80°C, critical ductile-to-brittle transition temperature Tkb, and nil ductility temperature NDT), and crack resistance according to a CTOD criterion in a low-temperature range to meet the requirements of the RMRS “Rules for the Classification and Construction of Ships” for steel with the Arc40 index.

Keywords:

low-alloy steel economically alloyed steel Arc index thermomechanical treatment quenching quenching from rolling heating tempering mechanical properties cold resistance serviceability crack resistance structure parameters ferrite bainite martensite 

Notes

ACKNOWLEDGMENTS

Studies of the anisotropy coefficient for ferrite-bainitic structure Ka calculated according to a certified method of JSC Tiksomet, were carried out in collaboration with Dr. Sci. (Eng.) A.A. Kazakov and Cand. Sci (Eng) P.V. Kovalev (St. Petersburg Polytechnic University).

Fine structure studies were performed in conjunction with Cand. Sci. (Eng). G.D. Motovilina and M.S. Mikhailov (National Research Center Kurchatov Institute—Central Research Institute of Structural Materials Prometey); the EBSD analysis was carried out jointly with Cand. Sci. (Chem) S.N. Petrov and E.A. Vasilyeva (National Research Center Kurchatov Institute—Central Research Institute of Structural Materials Prometey).

FUNDING

The work was partly supported within the scope of the project “Arctic Steel” according to state contract with the Ministry of Industry and Тrade of the Russian Federation no. 16411.1810190019.09.003 of October 20, 2016.

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© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.National Research Center Kurchatov Institute—Central Research Institute of Structural Materials PrometeySt. PetersburgRussia

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