连铸坯表面缺陷在圆钢轧制过程中的演变规律研究  

Study on the Evolution of Surface Defects of Continuous Casting Slab During Round Bar Rolling

作　　者：刘明远 LIU Mingyuan(Technology Center,HBIS Group Xuansteel Company,Zhangjiakou 075100,China)

机构地区：[1]河钢宣钢技术中心,河北张家口075100

出　　处：《山东冶金》2021年第2期37-40,共4页Shandong Metallurgy

摘　　要：选取表面存在划伤、渣沟、结疤的连铸坯进行定向轧制,并通过在铸坯表面人工预制裂纹的方法,利用酸洗、顶锻、金相及扫描电镜等手段,分析了铸坯缺陷在轧制φ20~60 mm圆钢过程中的演变规律及对应关系,总结出了不同产品规格对连铸坯表面缺陷的要求。结果表明,划伤、结疤、裂纹缺陷的深度遗传性较强,轧制圆钢规格越大,对铸坯表面要求越严格,而铸坯渣沟缺陷容易伴生夹杂缺陷,需进行铸坯表面清理方可轧制。The continuous casting slab with scratch,slag groove and scab on the surface was selected for directional rolling,and the evolution rules and corresponding relations of slab defects in the rolling process of 20-60 mm round steel were analyzed by means of acid pickling,upsetting,metallography and scanning electron microscope,and the requirements of different product specifications for continuous casting slab surface defects were summarized.The results show that the depth of scratch,scab and crack defects has strong heredity.The larger the size of rolled round steel is,the more strict the requirements on the slab surface are.The slag groove defects of slab are easy to be accompanied by inclusion defects,so the slab surface should be cleaned before rolling.

关 键 词：连铸坯 表面缺陷 圆钢轧制 演变规律 

分 类 号：TG335.6[金属学及工艺—金属压力加工]