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发明公开
CN105132817A 1200MPa级冷轧退火双相钢及其生产方法 无效 - 撤回

1200MPa级冷轧退火双相钢及其生产方法
摘要：
本发明公开了一种1200MPa级冷轧退火双相钢及其生产方法，其包括热轧、冷轧退火和平整工序，采用下述质量百分比化学成分的连铸坯进行热轧：C0.14～0.20%，Mn1.5～2.0%，S≤0.005%，P≤0.010%，Si0.2～0.6%，Nb0.015～0.030%，Ti0.010～0.030%，Als≥0.030%，Cr0.30～0.70%，N≤50ppm，其余为Fe和不可避免的杂质。本双相钢的抗拉强度在1200MPa以上，断后伸长率在6%以上，具有连续屈服特征和良好的烘烤硬化性能；可用于制备机械防撞件及加强件中的用途，尤其用于制备汽车用防撞件、加强件及汽车的门槛踏板。
摘要（英）：

The invention discloses1200MPa-grade cold-rolled annealed dual-phase steel and a production method thereof. The production method of the 1200MPa-grade cold-rolled annealed dual-phase steel comprises the steps of hot rolling, cold rolling and annealing, and flattening. A continuous casted billet prepared from, by mass, 0.14%-0.20% of C, 1.5%-2.0% of Mn, 0%-0.005% of S, 0%-0.010% of P, 0.2%-0.6% of Si, 0.015%-0.030% of Nb, 0.010%-0.030% of Ti, 0.030% or more of Als, 0.30%-0.70% of Cr, 0%-0.000050% of N and the balance Fe and inevitable impurities is subjected to hot rolling. The tensile strength of the dual-phase steel is over 1200 MPa, the percentage elongation after fracture of the dual-phase steel is over 6%, and the dual-phase steel has the continuous yielding property and the good bake hardening performance; the dual-phase steel can be used for manufacturing mechanical anti-collision parts and reinforcing parts and particularly can be used for manufacturing anti-collision parts and reinforcing parts of automobiles and doorsill footboards of the automobiles.

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