Abstract—The results obtained upon choosing rational alloying and microalloying for cold-resistant steels with a guaranteed yield strength of 315–750 MPa on the basis of established interrelations between phase transformations, structure, mechanical properties, serviceability parameters, and the content of main alloying elements are presented. Quantitative requirements for various structural parameters and their maximum permissible difference throughout sheet product thickness up to 100 mm have been developed, depending on the strength category and manufacturing technology (thermomechanical treatment with accelerated cooling, quenching from separate furnace heating or rolling heating with high temperature tempering) to provide guaranteed characteristics of strength, cold resistance (impact energy KV at a testing temperature from –60 to –80°С, critical ductile-to-brittle transition temperature Тkb, and nil ductility temperature NDT), and crack resistance according to the criterion of critical crack tip opening displacement (CTOD).
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Notes
Tkb is the critical temperature of brittleness at which at least 70% of a fibrous component is observed in the break of a full-thickness sample with a concentrator in the form of a notch under a three-point static bend to fracture.
NDT is the critical temperature of brittleness (“nil ductility temperature”) defined as the maximum temperature at which a breakage of a standard-sized sample with brittle cladding and a crack-initiating notch under impact loading occurs.
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Funding
This work was partly supported within the scope of the project “Arctic Steel” according to state contract with the Ministry of Industry and Trade of the Russian Federation no. 16411.1810190019.09.003 of October 20, 2016.
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Sych, O.V. Scientific and Technological Bases for Developing Cold-Resistant Steel with a Guaranteed Yield Strength of 315–750 MPa for Arctic Conditions. Part 1: Alloying Principles and Requirements for Sheet Product Structure. Inorg. Mater. Appl. Res. 10, 1265–1281 (2019). https://doi.org/10.1134/S207511331906025X
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DOI: https://doi.org/10.1134/S207511331906025X