X1215易切削钢连铸坯成分偏析的研究

Study on composition segregation of X1215 free-cutting steel continuous casting billet

摘要: 采用化学分析和低倍酸浸实验方法研究了低碳高硫易切削钢连铸坯的C、Si、Mn、P、S的成分偏析特征并分析其形成原因.结果表明,连铸坯的C、Si、Mn、P、S的偏析度均在0.9~1.1之间,S、P元素存在中心负偏析,低倍酸浸实验检测发现连铸坯存在中心疏松.分析认为,中心疏松是导致中心元素负偏析的主要原因.

Abstract: The characteristics and reasons of C,Si,Mn,P,S composition segregations in low carbon high sulfur free cutting steel were researched by chemical analysis and hot hydrochloric acid. The results show that the segregation degree of elements (C, Si, Mn, P, S) is between 0.9 and 1.1,S and P elements are negative segregation at the billet center region,and the center area of continuous casting billet is porosity. The analyses show that the center porosity is the main reason of element negative segregations at the center area.