材料期刊网

连铸板坯SS400生产检验中出现表面纵裂缺陷。对有裂纹的连铸板坯进行热塑性试验、低倍、金相组织和夹杂物分析。结果表明，钢水中[S]含量高、钢中存在夹杂物、连铸板坯坯壳厚度不均匀、结晶器锥度和矫直温度不合理均可引起连铸板坯表面纵裂。提出了避免连铸板坯产生表面裂纹的措施。

Some longitudinal cracks on the surface of the continuous cast slab SS400 were detected. The slabs with these cracks were analyzed by the means of high temperature plasticity , macrostructure, microstructure and inclusion test. The results showed that the reasons caused the surface longitudinal cracks included the high content of [S] in the molten steel , the inclusions in the slab, the variable slab surface shell thickness ,unreasonable mold taper and straighten temperature. Some ways to control the surface cracks in the continuous cast slab were proposed.