STRUCTURAL CRYOGENIC AUSTENITIC HIGH-STRENGTH WELDED STEEL AND METHOD FOR PRODUCTION THEREOF

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FIELD : metallurgy. SUBSTANCE : invention relates to metallurgy, specifically to production of structural austenitic steel for production of cold-resistant high-strength welded structures used in transportation of liquefied gases. Steel contains following elements, in wt% : C 0.05-0.07, Cr 18.0-20.0, Ni 5.0-7.0, Mn 8.0-10.0, Mo 1.4-1.8, Si 0.25-0.35, N 0.25-0.28, Al 0.015-0.035, 0.005-0.008 rare-earth elements, Cu ≤0.05, S ≤0.0025, P ≤0.010, Sn ≤0.005, Pb ≤0.005, Bi ≤ 0.005, As ≤ 0.005, Fe - balance. At least 60 % of total amount of rare-earth elements are contained in steel in form of nano-sized particles. EFFECT : obtaining steel with required set of strength properties at room temperature, viscosity in range of cryogenic temperatures and weldability. 2 cl, 1 tbl