以低碳复合添加微合金元素铌和钛为成分设计思路,综合运用细晶强化、相变强化和析出强化三种强化机制,在国内某厂1750mm半连续热连轧机组进行了780MPa级大梁钢的工业试制.结果表明,终轧温度需控制在780～860℃,卷取温度需控制在450～550℃.大梁钢的显微组织为贝氏体和少量的细晶铁素体,并获得了大量弥散的尺度为10nm以下的(Nb,Ti)C析出物.大梁钢的屈服强度为700MPa,抗拉强度为780MPa,伸长率为19%.大梁钢具有良好的低温冲击韧性、冷弯成形性及焊接性能.
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