65Mn钢冷轧起皮缺陷分析与控制

Analysis and control of peeling defects of 65Mn steel in cold rolling

对65Mn钢在轧制过程中起皮缺陷部位进行扫描电镜、金相检验等分析,确定其产生原因。结果表明:铸坯中裂纹是导致长条断续状冷轧起皮缺陷产生的主要原因;气泡和针孔缺陷是导致点状冷轧起皮缺陷产生的主要原因。主要通过优化连铸生产工艺,降低铸坯中裂纹、气泡和针孔缺陷的发生,最终使长条断续状起皮缺陷从1.7%降低到0.04%,点状起皮缺陷得到完全控制,使产品质量得到用户认可。

Scanning electron microscope and metallographic examination were carried out to determine the cause of peeling defect of 65 Mn steel during rolling. The results showed that the crack in casting billet was the main reason of strip discontinuous peeling defect in cold rolling. The bubble and pinhole defects were the main causes of spot peeling defects in cold rolling. After optimizing the continuous casting process, the occurrence of cracks, bubbles and pinholes in the billet was reduced. Finally, the strip discontinuous peeling defect reduced from 1.7 % to 0.04 %, the spot peeling defects were completely controlled, and product quality was recognized by users.