热轧低碳钢冷轧边裂原因分析及改善措施
Reason Analysis and Improvement Measures for Edge Crack of Hot-Rolled Low Carbon Steel after Cold Rolling

本文对Q195冷轧基料用途卷板经冷轧后存在边裂现象进行了分析。经过现场调查及金相检测，认为冷轧后边裂主要原因为热轧原带边部存在表层粗晶及全厚度混晶，混晶组织在后续冷轧中与基体组织的塑性存在差异，容易在变形过程中出现开裂现象。通过减少机架间冷却水及防剥落水使用数量，可控制边部粗晶范围及全厚度混晶范围。
This article examined severe edge crack strips of Q195 steel. By means of field investigation and metallographic examination, it is considered that the main reason for edge cracks after cold rolling is the existence of surface coarse grains and full-thickness mixed grains at the edge of the hot rolled original strip. The plasticity of the mixed grain structure is different from that of the matrix structure in the subsequent cold rolling, which is easy to crack in the deformation process. By reducing the amount of cooling water and anti-stripping water used between racks, the coarse crystal range at the edge and the full-thickness mixed crystal range can be controlled.