Patent ID: 9598751
Date: 2017-03-21
CPC Classifications: C21D,C22C

Claim:
1. A high strength cold-rolled steel sheet exhibiting little variation in strength and ductility, comprising: C: 0.10-0.25%; Si: 0.5-2.0%; Mn: 1.0-3.0%; P: 0.1% or less exclusive of 0%; S: 0.01% or less exclusive of 0%; Al: 0.01-0.05%; and N: 0.01% or less exclusive of 0% respectively, with the remainder being iron and inevitable impurities, wherein % is mass % for each element with respect to the chemical composition; wherein a microstructure of the high strength cold-rolled steel sheet comprises: wherein the tensile strength of the high strength cold-rolled steel sheet is 980 MPa or more.