SOFTENING MECHANISM OF BORON-BEARING LOW-CARBON HOT STRIPS PRODUCED BY TSCR ROUTE
Softening Mechanism of Boron—Bearing Low--Carbon Hot Strips Produced by TSCR Route

通过薄板坯连铸连轧(TSCR)生产典型低碳铝镇静钢SPHC(一般用热轧钢带)流程的实验室模拟,分析了含(10- 50)×10-6 B,0．005％N热轧钢带的组织、析出物的特点以及性能变化．结果表明:由于粗大BN的优先析出抑制了细小AIN的析出,提高了晶粒的生长能力,以及B在奥氏体晶界的偏聚抑制了铁素体形核,使得含B热轧钢带晶粒明显粗化,通过测定,含B钢晶粒度达到7-8级,平均晶粒尺寸达到25μm．含B钢晶粒粗化以及钢中AlN析出量和自由N含量的降低,使得热轧钢带屈服强度与无B钢相比降低约94 MPa．