COLD ROLLED STEEL SHEET, METHOD OF MANUFACTURING AND VEHICLE Russian patent published in 2018 - IPC C22C38/38 C21D8/02 C23C2/06 C23C2/12 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to cold-rolled steel sheet having a melt-immersion coating used in the automotive industry. Steel comprises, by weight percent: 0.1≤C≤0.5; 3.5≤Mn≤10.0; Al≤9.0; Si≤5.0; Ti≤0.2; V≤0.2; Nb≤0.2; S≤0.004; P≤0.025; 0.5≤Si+Al≤9.0; B≤0.0035; Cr≤1, the rest is Fe and impurities. Steel sheet has a microstructure containing from 25 % to 90 % of ferrite and from 10 % to 50 % of austenite and martensite lower than 25 %.

EFFECT: tensile strength is more than 1,000-50×Al MPa, uniform elongation of more than 15 % and low specific gravity.

26 cl, 9 dwg, 5 tbl