控轧控冷工艺对B510L组织性能的影响

Effect of controlled rolling and controlled cooling on mechanical properties and microstructure of B510L

对B510L采用不同形变热处理工艺进行了实验,分析了加热温度、终轧温度和卷取温度对实验钢力学性能和微观组织的影响.结合加热温度对合金元素Nb的作用机理进行了探讨,分析了贝氏体对带钢性能的影响.提出了适合工厂试生产的工艺制度为:加热温度1200℃保温2～3h;终轧温度780～800℃,精轧压下量>80％;卷取温度400℃左右.

Controlled rolling and controlled cooling experiments have been carried out on a B510L steel in different schedules. The effects of reheating temperature, finish rolling temperature and coiling temperature on the mechanical properties and microstructures of the steel were investigated. The function of Nb was also analyzed. The result shows that the existence of some amount of granular bainite can increase the strength and reduce the yield ratio of the steel. The schedules which are suitable for the practical production are as the follows: reheating the billet at 1200℃ for 2-3 h; controlling finish rolling temperature in the temperature range of 780-800℃; the reduction for finish rolling mills larger than 80% and coiling temperature around 400℃.