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Scientific and technological bases for creation of cold-resistant steel with a guaranteed yield strength of 315–750 MPa for the Arctic. Part 1: Principles of alloying and requirements for sheet metal structure
https://doi.org/10.22349/1994-6716-2018-95-3-22-47
Abstract
The results of the choice of rational alloying and microalloying of cold-resistant steels with a guaranteed yield strength of 315–750 MPa are presented on the basis of the established interrelationship of phase transformations, structure, mechanical properties and performance characteristics when varying the content of basic alloying elements. Quantitative requirements for various structural parameters and their maximum permissible difference in sheet metal thickness up to 100 mm have been developed, depending on the strength category, manufacturing technology (thermomechanical treatment with accelerated cooling, hardening from separate furnace or rolling heating with high temperature tempering), which provide guaranteed characteristics of strength, cold resistance (impact work KV at test temperature –60 ... –80°С, critical temperatures of viscousbrittle transition Тк and zero ductility NDT) and crack resistance under the criterion of the critical opening in the top CTOD fracture.
Keywords
low-alloyed steel,
economically alloyed steel,
Arc index,
thermomechanical processing,
hardening,
quenching from rolling heating,
tempering,
mechanical properties,
cold resistance,
serviceability,
crack resistance,
structure parameters,
ferrite,
bainite,
martensite
Supporting agencies: Part of the research was carried out in the framework of the project “Arctic Steel” under the state contract with the Ministry of industry and Тrade of the Russian Federation No 16411.1810190019.09.003 signed on October 20, 2016.
About the Author
O. V. Sych
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sci. (Eng)
49 Shpalernaya St, 191015, St Petersburg
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For citations:
Sych O.V. Scientific and technological bases for creation of cold-resistant steel with a guaranteed yield strength of 315–750 MPa for the Arctic. Part 1: Principles of alloying and requirements for sheet metal structure. Voprosy Materialovedeniya. 2018;(3(95)):22-47. (In Russ.) https://doi.org/10.22349/1994-6716-2018-95-3-22-47
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