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对集装箱钢铸坯表面纵裂纹开裂面不同位置处保护渣所含成分的分析结果表明 ,纵裂纹是在结晶器内生成 ,在二冷区扩展成裂纹缺陷的。由铸坯试样高温延塑性测试结果可知 ,在 775～ 82 5℃之间 ,集装箱钢处于脆性严重的状态。通过采用增加结晶器铜板上部镀层厚度降低热流和改用新的二冷工艺等措施 ,使集装箱钢铸坯表面的纵裂缺陷发生率大幅度减少
Analysis of the contents of the mold powder contained in different positions on the cracking surface of longitudinal cracks in the container steel slab showed that the longitudinal cracks were generated in the mold and extended to crack defects in the second cooling zone. From the slab sample high temperature ductility test results show that in the 775 ~ 82 5 ℃, container steel in a brittle state. By adopting the method of increasing the thickness of the upper plating layer of the mold copper plate to reduce the heat flow and switching to a new secondary cooling process, the incidence of longitudinal splitting defects on the surface of the steel slab of the container is greatly reduced