摘要:
为改进热轧带钢质量,采用OM、SEM和EDS研究了热轧带钢翘皮及边损缺陷的微观形貌、化学成分,分析了其产生的原因。结果表明,翘皮缺陷处含有铁氧化物、二次氧化物和结晶器保护渣成分,产生的原因有结晶器保护渣卷渣、铸坯表面裂纹、热轧板表面划伤、轧钢翻边等。边损缺陷处含有铁氧化物、二次氧化物、钙铝酸盐和Mn S,产生的原因有铸坯表面裂纹、炼钢过程中的内生夹杂物等。提高连铸坯质量,控制热轧过程中缺陷的产生,是获取高品质热轧带钢的关键。
Abstract:
In order to improve quality of strip steel,the microstructure and chemical composition of surface upwarping and edge defects regions were investigated by OM,SEM,and EDS,and the causes were analyzed.The results show that,there are iron oxides,secondary oxidation and composition of mold flux in surface upwarping regions,which are expected to come from slag entrapment in mold,surface cracks on continuous casting billet,surface scratches on hot strip,flanging in rolling processes. There are iron oxide,secondary oxidation,calcium aluminates and Mn S in edge defects,the reason may be attributed to cracks on continuous casting billet and internal inclusion in steelmaking process. The key to obtain high quality of hot rolled strip are improving the quality of continuous casting billet and controlling defect in hot rolling process.
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