提出一种低碳微合金MnCuNiCrMo钢,测试了其过冷奥氏体连续冷却相变(CCT)曲线,分别研究未再结晶区变形量、冷却速率对其相变行为的影响.使用厚板坯连铸(CC)—钢板控轧控冷(TMCP)工艺流程,在5m宽厚板工业生产线上成功开发出60 mm特厚Q500qENH桥梁钢板.开发钢板的显微组织为细密粒状贝氏体(GB)+针状铁素体(AF)+多边形铁素体(PF);横向室温屈服强度大于560MPa,抗拉强度大于660MPa,伸长率大于20％;Z向面缩率大于76％;-40℃下纵向Charpy冲击吸收能量(KV2)大于170J;零塑性温度为-85℃.
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