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为开发屈服强度大于550 MPa、-60℃冲击功高于37 J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164 J。
In order to develop high strength hot rolled steel plate with yield strength greater than 550 MPa and impact energy of -60 ℃ higher than 37 J, a series of experimental studies were carried out. Two types of test steels were proposed, CSiMnCuNiMo (A) and CSiMnCuNiCrMo (B) low alloy steels. The Gleeble 3800 thermal simulator was used to systematically study the phase transformation kinetics and microstructure of austenite during continuous hot deformation of steel A under heat engine deformation. In the two-roll reversible test rolling mill, the control of heavy plate rolling and controlled cooling were carried out, the microstructure and mechanical properties of the two kinds of steel were studied. The TMCP technical route was determined: a two-stage controlled rolling of recrystallized zone and non-recrystallized zone followed by rapid cooling. 2 kinds of steel in the hot-rolled when the rolling reduction rate of not less than 65%. Steel A was cooled to 500 ° C at a rate of 20 ° C / s; Steel B was cooled to 400 ° C at a rate of 13 ° C / s. -80 ℃ Xiaoshi low temperature impact toughness average 307 J and 164 J. respectively.