包晶钢中间包快换板坯接痕漏钢原因分析

为了研究包晶钢中间包快换过程中板坯接痕处漏钢的问题,对现场调查发生规律持续进行跟踪,采用扫描电镜对接痕处漏钢机理进行分析。结果表明,中间包快换过程中漏钢与坯壳收缩和接痕处非金属夹杂物聚集有关,非金属夹杂物成分为保护渣。通过优化中间包快换过程坯壳冷却补缩程序、优化钢水过热度、增加连接件、优化清理保护渣渣条、改进开浇等措施,包晶钢中间包快换过程板坯接痕漏钢事故得到有效抑制,发生率由1.08%降至0。

Analysis on cause of peritectic steel breakout at slab joint in process of quick change of tundish

In order to study the problem of breakout at the slab joint of peritectic steel in the process of quick change tundish, the occurrence law was continuously investigated on site, and the breakout mechanism was analyzed by scanning electron microscope. The results show that the breakout is related to the shrinkage of slab shell and the accumulation of non-metallic inclusions at the joint mark, in which the non-metallic inclusion is mold flux. By optimizing the shell cooling and feeding program, optimizing the superheat of molten steel, adding connectors, optimizing the cleaning operation of mold flux and slag strip, and improving the casting start operation, the breakout of slab joint mark in the process of quick change of tundish of peritectic steel was effectively restrained, and the breakout rate was reduced from 1.08% to 0.