Cold-rolled steel sheet, stamping member, and manufacturing method for cold-rolled steel sheet

Abstract

Disclosed in the present invention is a cold-rolled steel sheet, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: C: 0.06-0.10 wt %, Si: 0.01-0.5 wt %, Mn: 1.6-2.5 wt %, Al: 0.01-0.07 wt %, Cr: 0.5-1.0 wt %, Mo: 0.1-0.3 wt %, Ti: 0.01-0.05 wt %, Nb: 0.001-0.03 wt %, B: 0.0001-0.005 wt %, and 0<N≤0.006 wt %. A microstructure of the cold-rolled steel sheet is that spherical cementite particles are evenly distributed on a single-phase ferrite matrix, wherein a spheroidization rate of spherical cementite is greater than or equal to 90%. Correspondingly, further disclosed in the present invention are a manufacturing method for the cold-rolled steel sheet, and a stamping member manufactured by using the cold-rolled steel sheet.

Dependencies are inferred from the claim text.