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本发明揭示了深冲性能良好的冷轧双相钢板、这种钢板由铁素体及低温相变组织构成,其成分为(按重量计算):C,0.001～0.008%;Si,≤1.0%;Mn,0.05～1.8%;P,≤0.15％;Al,0.01～0.10％;当(Nb+10B,％)复和值为0.010～0.080%时,Nb占0.002～0.050％,B占0.0005～0.0050％,如需要,可加Cr 0.05～1.00％,其余主要是Fe及不可避免的杂质。这种钢板的生产方法如下:将含有上述化学成分的钢坯,经热轧、冷轧后进行连续退火,连续退火的方式是在α→γ转变点至1000℃的温度范围内,将钢板加热并均热,然后,以≥0.5～<20℃/s的平均冷却速度,将钢板由均热温度冷却到750℃,再以≥20℃/s的平均冷却速度将钢板冷却到≤300℃。
The present invention discloses a cold-rolled dual-phase steel sheet having good deep drawability. The steel sheet consists of ferrite and a low-temperature phase-change structure and has the following composition (by weight): 0.001 to 0.008% of C, , Mn is 0.05-1.8%, P is less than or equal to 0.15%, Al is 0.01-0.10%, Nb is 0.002-0.050% when B complex value is 0.010-0.080%, B is 0.0005-0.050% 0.0050%, if necessary, can add Cr 0.05 ~ 1.00%, the rest are mainly Fe and inevitable impurities. The method for producing such a steel sheet is as follows. The steel slab containing the above chemical composition is subjected to continuous annealing after hot-rolling and cold-rolling, and continuous annealing is performed by heating the steel sheet at a temperature range from α → γ transition point to 1000 ° C Soaking the steel plate from the soaking temperature to 750 ° C at an average cooling rate of ≧ 0.5 to <20 ° C / s and cooling the steel plate to ≦ 300 ° C at an average cooling rate of ≧ 20 ° C / s.