针对安钢热连轧SPHC钢在轧后出现的严重破边现象，对热轧板卷破边的成因及防治措施进行了研究。从机制认识出发，结合金相检验、扫描电镜分析、成分分析等方法，对破边缺陷的特征及成因进行了分析。结果表明，热轧板卷破边可能与板坯角部表观质量没有直接关联，钢中Mn/S比偏低及加热温度偏高也将导致热轧板卷破边缺陷严重。据此，从生产工艺上改进，提出相应的解决措施并取得明显效果。
The mechanism and countermeasures of the edgecrack defect in hot rolled coils are studied for the serious edgecrack defect in SPHC grade hot rolled coils of Anyang Steel Plant. The characteristics and mechanism of edgecrack defect were investigated by the means of metallographic inspection, SEM analysis as well as chemical composition analysis. The results show that the coil edgecracks may not be directly produced from the corner defects of slabs. The lower Mn/S ratio in steel composition and higher heating temperature of the reheating process can also be the main reasons for the coil edgecracks defect. The relevant countermeasures were put forward accordingly which help eliminate the defect effectively.
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