1300-mpa-grade-or-higher cold-rolled steel sheet and manufacturing method therefor

Abstract

Disclosed in the present invention are a 1300-MPa-grade-or-higher cold-rolled steel sheet and a manufacturing method therefor. The cold-rolled steel sheet comprises Fe and inevitable impurity elements, and further comprises the following chemical elements in percentages by mass: 0.10-0.30% of C, 0.1-0.5% of Si, 0.8-2.5% of Mn, 0.01-0.03% of Al, 0.001-0.003% of B, and 0-0.05% of Ti, wherein the mass percentage contents of C and Mn satisfy: C+Mn/6≥0.35%. By means of a reasonable chemical component design and a reasonable manufacturing process, the 1300-MPa-grade-or-higher cold-rolled steel sheet has an ultrahigh strength, and also has good resistance to delayed cracking and good bending performance.

Dependencies are inferred from the claim text.