冷轧板孔洞缺陷成因分析

摘要

Cavity is one of common defects in cold -rolled steel sheets .Cavity can be divided into three categories:normal drawing breakage type cavity which is mainly related with inclusions in the steel base , scar-shaped cavity and hole -shaped cavity which are mainly caused by steel -based block dropped in-to or foreign materials pressed into the steel base , and other types of cavities which are related with rolling process control .Cavities caused by cold -rolling factors are related to unreasonable distribution of rolling forces and tensions , foreign matters pressed into the steel base during cold rolling and not good sheet shape .This paper focuses on analysis of cold rolling cavity caused by hot rolling process .Through scan-ning electron microscopy , metalloscope , hot rolling online surface inspection instrument , comparison a-nalysis of the causes of cavity defect in cold -rolled sheet is made , and relevant measures are taken ac-cording to the results of analysis .%冷轧板孔洞是薄规格冷轧产品中常见的一种缺陷。孔洞大致可分为三大类：正常拉裂类孔洞主要与基体的夹杂有关；疤块孔洞与坑状孔洞主要为钢基掉块或异物压入基体形成，其它类孔洞与轧制工艺过程控制有关；冷轧因素引起的孔洞与轧制力及张力分配不合理、冷轧异物压入及板型不良等因素有关、本文重点对热轧工序原因造成的冷轧孔洞缺陷进行了分析，采用扫描电镜、金相显微镜、热轧在线表面检测仪等设备对比分析了冷轧板出现的孔洞缺陷出现的原因，根据分析结果制定了相关的措施。