連鑄圓坯表面氣孔缺陷的分析

Analysis of Surface Porous Defects of Continuously-cast Round Billet

摘要: 國內連鑄圓坯大多采用“轉爐+LF爐”或采用生產節(jié)奏較快的“電爐+LF爐”生產, 有時發(fā)現(xiàn)連鑄圓坯存在一種表面氣孔缺陷, 其形態(tài)特征與鑄坯常見的表面針孔、皮下氣泡和內部氣孔有明顯的不同。簡要分析了這種連鑄圓坯表面氣孔缺陷產生的機理和表現(xiàn)特征, 據此提出了控制連鑄圓坯表面氣孔缺陷產生的措施。

Abstract: Most of the continuously-cast round billets used by domestic tube makers are produced by the “BOF + LF” process or the “EAF + LF” quick process which result in occasional occurrence of surface porous defects of the billet with morphological characteristics obviously other than the common surface porous defects such as pinhole, blister and interior porous hole of the cast billet. Brief analysis is made on the development mechanism and apparent characteristics of the surface porous defects of the continuously-cast round billet, based on which control measures for such defects are proposed.