IMPACT-RESISTANT AND TEAR-RESISTANT STEEL FOR SHIP HULL STRUCTURE AND METHOD OF ITS MANUFACTURING Russian patent published in 2024 - IPC C22C38/14 C22C38/06 C22C38/04 C22C38/02 C21D8/02 C21D9/46 C21D1/28 C21C7/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to impact and tear resistant sheet steel for ship hull structure. Steel contains, wt.%: C: 0.06–0.12, Si: 0.05–0.60, Mn: 1.50–1.70, Al: 0.01–0.06, Ti: 0.005–0.012, Mg: 0.0005–0.003, 0<Ca≤0.0035, where 0.0005<Ca+Mg≤0.004, if necessary at least one element from 0<Nb≤0.04, 0<V≤0.05 and 0<B≤0.0005, and optionally at least one element from Cr, Ni, Mo and Cu, the content of which corresponds to following condition: Cr+Ni+Mo+Cu≤0.5, balance—Fe and unavoidable impurities.

EFFECT: providing the required strength and impact strength, resistance to destruction and cracking, as well as impact resistance and tear resistance.

13 cl, 3 tbl