Cold-rolled steel strip for hot stamping molding and production method thereof

The invention relates to a cold-rolled steel strip for hot stamping molding and a production method thereof. The steel strip comprises, by weight percent, 0.32 to 0.36% of C, 0.10 to 0.30% of Si, 1.30to 1.50% of Mn, not larger than 0.020% of P, not larger than 0.005% of S, 0.020 to 0.060% of Als, 0.020 to 0.040% of Nb, 0.020 to 0.040% of Ti, 0.0015 to 0.0025% of B, 0.20 to 0.40% of Cr, not largerthan 0.0060% of N and the balance iron and inevitable impurities. The production method comprises following steps of steelmaking, continuous casting, hot rolling, acid rolling, continuous annealing,flattening and finished product obtaining. The tensile strength of the cold-rolled steel strip is larger than or equal to 1900 MPa, the yield strength is larger than or equal to 1450 MPa and the ductility A50 is larger than or equal to 5%. 本发明涉及一种热冲压成型用冷轧钢带及其生产方法，其化学成分重量百分比C：0.32～0.36Wt%；Si：0.10～0.30Wt%；Mn:1.30～1.50Wt%；P:≤0.020Wt%；S：≤0.005Wt%；Als:0.020～0.060Wt%；Nb：0.020～0.040Wt%；Ti：0.020～0.040Wt%；B：0.0015～0.0025Wt%；Cr：0.20～