为开发屈服强度大于550MPa、-60℃冲击功高于37J的高强度热轧厚钢板,开展了系列试验研究.提出2种试验钢,即CSiMnCuNiMo(A)和CsiMnCuNiCrMo(B)低合金钢.采用Gleeble 3800热模拟试验机,系统研究了钢A在热机变形条件下奥氏体连续冷却相变动力学和显微组织变化规律.在二辊可逆试验轧机上,进行了宽厚板控制轧制和控制冷却试验,研究了2种钢的显微组织和力学性能变化规律.确定了TMCP技术路线:采用再结晶区和未再结晶区两阶段控制轧制,随后快速冷却.2种钢在热轧时精轧压下率均不小于65%.钢A以20℃/s的速率冷却至500℃;钢B以13℃/s的速率冷却至400℃.-80℃夏氏低温冲击韧性平均值分别达到307 J和164J.
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