CSP热轧板卷边部裂纹成因初探  

Exploration on Edge Crack of CSP Hot Rolled Coil

作　　者：彭其春[1] 童志博[1] 胡建文[1] 杨柳[1] 刘炳宇[2] 钱龙[2] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉钢铁(集团)公司,湖北武汉430080

出　　处：《物理测试》2012年第4期36-39,42,共5页Physics Examination and Testing

摘　　要：对CSP工艺生产的热轧薄板边裂原因进行了金相检测、SEM和能谱等方法分析,结果表明:边部裂纹上表面和横截面裂纹附近组织与试样其他部位相同,均为铁素体+少量渗碳体,无脱碳组织,裂纹处主要元素为O、Si、Ca,且分布细长,有压碎痕迹,推测其为压碎的CaSiO3夹杂,并发现裂纹处有保护渣成分,推测SPHC边部裂纹是在轧制过程中形成的,且是由卷渣带入的大颗粒的CaSiO3夹杂,在轧制过程中,应力集中导致板卷开裂。By means of metallographic detection, SEM and energy spectrum analysis, the cause for edge crack of CSP hot rolled coil is analyzed. The result shows that., the upper surface and cross section near the crack has the same structure with other parts of sample, which are all ferrite, less cementite and no decarburization structure. The main elements in cracks are O, Si and Ca with the slender distribution and crush trace, which may be CaSiO3 in- clusion. And the casting powder is found in the crack, which is formed in the rolling process of SPHC. The stress concentration by large particles of CaSiO3 owing to slag entrainment are the main factors to produce crack of hot rolled strip coil.

关 键 词：热轧薄板 边部裂纹 CaSiO3夹杂 卷渣 

分 类 号：TG335.5[金属学及工艺—金属压力加工]