连铸圆管坯轧管内折成因分析

Internal Surface Folding Analysis of Continuous Casting Tube Rounds

针对包钢连铸圆管坯热轧无缝钢管产生大量内折缺陷这一问题,主要从铸坯质量入手,运用逐步回归方法,分析了形成内折的主要原因.研究结果表明,钢水精炼成分[Mn]/[S]过低,浇注过热度△t以及与其匹配的拉坯速度ν过高是造成铸坯质量的主要原因,为提高产品质量提供了参考依据.

During the hot rolling of seamless steel tubes, internal surface folding (ISF) is frequently formed in Baotou Iron & Steel Co. The main factors, which caused the ISF, are analyzed using the method of step regression. Results show that the lower value of [Mn]/[S], the higher casting overheaded level At and pulling velocity v are the main reasons caused ISF.