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在薄板坯连铸连轧生产线上,利用微合金元素Nb、Ti析出抑制再结晶发生,加工硬化奥氏体加速铁素体相变,轧后连续快速冷却至低温卷取,利用细晶强化和相变强化生产低成本高强度热轧双相钢。在FTSR生产线上进行工业试验。结果表明,在终轧800～820℃,快速冷却至卷取温度300℃以下,可以得到铁素体和马氏体双相组织,屈服强度400MPa以上,抗拉强度超过650MPa,屈强比低于0.70,伸长率大于20%。
In the thin slab continuous casting and rolling production line, the use of microalloying elements Nb, Ti precipitation inhibit recrystallization occurs, work hardening austenite accelerates the ferrite transformation, continuous rapid cooling after rolling to low temperature coiling, the use of fine grain strengthening and Phase change to strengthen the production of low-cost high-strength hot-rolled dual-phase steel. Industrial test on FTSR production line. The results show that in the final rolling 800 ~ 820 ℃, rapid cooling to the coiling temperature below 300 ℃, can be ferrite and martensite dual phase structure, the yield strength of 400MPa or more, the tensile strength of more than 650MPa, yield ratio lower than 0.70, elongation greater than 20%.