Analysis and Control on the Edge Cracking of Hot-Rolled Strips
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摘要: 采用金相显微镜、扫描电镜并结合工艺调查,对某厂热轧板卷边裂缺陷成因进行了研究分析。结果表明:冶炼脱氧不良、浇注异常是造成烂边边裂缺陷的主要原因;铸坯待轧时过热过烧是造成翘边边裂缺陷的主要原因。根据研究结果对生产工艺进行了优化,取得了较好的效果,板坯边裂缺陷率由8085炉/月降至45炉/月,板卷“烂边”缺陷基本消除,“翘边”缺陷率由17.6%降至1.2%。Abstract: The cause of edge cracking defect of hot-rolled strips was investigated and analyzed by metallographic microscope,SEM and process investigation.The results showed that bad deoxidization during smelting and the unstable casting operation are the main causes for continuous edge cracking of strips;The overheating and overburning of slab during ready rolling stage are the main causes for non-continuous edge cracking of strips.According to study results,the process was optimized and better results were obtained,the rate of edge cracking defects of slab decreased from 80~85 heats/month to 4~5 heats /month,the continuous edge cracking of hot-rolled strips was almost eliminated and the rate of the noncontinuous edge cracking of hot-rolled strips decreased from 17.6% to 1.2%.
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Key words:
- hot-rolled strips /
- edge cracking /
- deoxidation /
- heating temperature /
- heating time
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