采用SiMnTiNb低C钢成分、运用TMCP技术在1450 mm热连轧生产线上成功开发了一种屈服强度700 MPa级热轧超高强冷成形用钢.测定了开发钢的连续冷却相变(CCT)曲线,研究了其析出强化规律,测试了带钢的力学性能和冷弯性能,研究了其焊接性能.结果表明,其组织为4～5μm细晶粒铁素体+贝氏体+少量马氏体,铁素体晶粒中含Nb-Ti沉淀相.超高强度的获得归功于细晶强化+相变强化+析出强化.所开发的热带钢冷弯成形性和焊接性能良好.
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