METHOD OF PRODUCING HIGH-STRENGTH CORROSION-RESISTANT PLAQUE STEEL Russian patent published in 2018 - IPC C22C38/12 C22C38/18 B32B15/18 

FIELD: metallurgy.

SUBSTANCE: method of producing high-strength corrosion-resistant plaque steel plates includes hot rolling at a temperature of not more than 1250°C with its end at temperatures above 880°C, coiling a strip at a temperature of 570-660°C. The basic layer is made of low-carbon steel, micro-alloyed by molybdenum and titanium, facilitating interphase nanosized carbide and carbonitride precipitations, and the cladding layer is made of corrosion-resistant austenitic steel, the composition of which satisfies the condition for Cr_Eq/Ni_Eq≤1.6. The chromium equivalent is Cr_Eq=%Cr+1.37%Mo+1.5%Si+2%Nb+3%Ti, and the nickel equivalent is Ni_Eq=% Ni+0.31%Mn+22%C+14.2%N+%Cu.

EFFECT: provision of stable high values of strength, plasticity, cold resistance, corrosion resistance, continuity of layer interconnection and weldability.

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