锰硫比对SPHC热轧薄板边部舌状裂纹的影响  

Effect of w(Mn)/w(S) on Ligulate Crack of SPHC Hot-rolled Sheet

作　　者：徐海卫[1] 于洋[1] 朱国森[1] 李金宝[2] 安冬阳 焦会立[2] 关建东[2] 刘兰宵 吴耐[2] 王伦[2] 武军宽[2] 余威[2] 

机构地区：[1]首钢技术研究院,北京100041 [2]首钢迁安钢铁有限责任公司,河北迁安064404

出　　处：《轧钢》2011年第5期14-16,共3页Steel Rolling

摘　　要：针对迁钢2160mm热轧线生产的SPHC热轧薄板经常出现边部舌状裂纹缺陷,研究了舌状裂纹的形貌及形成机理。结果表明,SPHC薄板边部舌状裂纹缺陷的产生是由于Mn含量较低导致锰硫比较低,使板坯边角部位易出现微裂纹,并在轧制过程中流变至带钢边部而形成。经实践,w(Mn)/w(S)>20时,可有效避免SPHC板边部舌状裂纹的产生。To the problem of ligulate crack on edge of SPHC hot-rolled sheet at Qiangang, the appearance and formation mechanism of the defect were investigated. The results show that the main reason of ligulate crack on edge of SPHC sheet is w（Mn）/w（S） decreasing result in micro-cracks on corner site rheology to strip edge during rolling. The production practice show that edge ligulate crack can be avoided when w（Mn）/w（S）〉20.

关 键 词：舌状裂纹 SPHC热轧薄板 锰硫比 

分 类 号：TG335.5[金属学及工艺—金属压力加工]