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为开发低成本Q500E低合金高强度厚钢板,系统研究了未再结晶区变形量和变形后冷却速率对一种低合金钢奥氏体连续冷却相变(CCT)行为和组织变化规律的影响。通过系列TMCP试验,探讨了精轧温度对试验钢板显微组织和力学性能的影响。结果表明,未再结晶区变形量、变形后冷却速率和精轧温度均能显著影响试验钢的显微组织和力学性能。生产低成本Q500E厚钢板的TMCP工艺为:在奥氏体再结晶区和未再结晶区进行两阶段轧制,精轧温度800～850℃,精轧压下率75%,轧后以高于10℃/s的冷却速率冷却至450～500℃。
In order to develop low cost Q500E low alloy high strength steel plate, the effect of deformation of unrecrystallized zone and post-deformation cooling rate on austenite continuous cooling transformation (CCT) behavior and microstructure change of a low alloy steel was systematically studied. Through series TMCP test, the effect of finishing temperature on the microstructure and mechanical properties of the test steel was discussed. The results show that the deformation of non-recrystallized zone, the cooling rate after deformation and the finishing temperature can significantly affect the microstructure and mechanical properties of the test steel. The TMCP process for producing low-cost Q500E steel plates consists of two stages of rolling in austenite recrystallization and non-recrystallization, a finish rolling temperature of 800 to 850 ° C and a finish rolling reduction of 75% The cooling rate of 10 ° C / s is cooled to 450 to 500 ° C.