作者单位:SUN Hong-liang,WEI Huan-jun,JIA Hui-shu(Technical Center of Tangshan Iron and Steel Co. , Ltd. , Tangshan 063016, China)孙宏亮,魏焕君,贾慧淑(唐山钢铁股份有限公司技术中心,河北唐山063016)WANG Yan-chun,LI Xiao-hong(Metallurgical Department, Tangshan Vocational College of Science and Technology, Tangshan 063001, China)王艳春,李小红(唐山科技职业技术学院冶金系,河北唐山063001)