DP780QX双相钢CCT曲线分析

DP780QX DUPLEX STEEL CCT CURVE ANALYSIS

以DP780QX双相钢为研究对象,模拟研究了铸坯加热温度、铸坯保温时间、卷取温度、终轧温度等对其相变膨胀总量、膨胀速度、百分比以及抗拉强度的影响规律,并在此基础上进行了生产实践。模拟结果显示,热轧时的铸坯加热温度、铸坯保温时间、终轧温度、卷取温度(约620℃)等均不会对DP780QX热轧板的抗拉强度造成明显的影响;相变在569~456℃即已全部完成,其组织为铁素体+贝氏体,620℃卷取时抗拉强度约820 MPa,发生塌卷的可能性很小。实际生产中DP780QX热轧板强度波动较大的原因可能是热取样时间节点不一致。

DP780QX duplex steel was used as the research object to simulate and study the influence of billet heating temperature, billet holding time, coiling temperature and final rolling temperature on the total amount of phase change expansion, expansion rate, percentage and tensile strength of the casting billet, and the production practice was carried out on this basis. The simulation results show that the heating temperature, holding time, final rolling temperature and coiling temperature(about 620 ℃) of the casting billet during hot rolling will not have obvious effects on the tensile strength of DP780QX hot rolled plate. The phase change has been completed at 569~456 ℃, its structure is ferrite + bainite, and the tensile strength is about 820 MPa when coiled at 620 ℃, and the possibility of collapse is very small. In actual production, the reason for the large fluctuation of the strength of hot-rolled plate in the production of DP780QX steel may be the inconsistency of the hot sampling time node.