220方低碳合金钢铸坯质量提升的实践

为了研究出脱方和表面裂纹对铸坯质量的影响情况,通过理论及生产实践,采用了改善保护渣与钢种的匹配情况、调节结晶器水缝间距和优化二冷工序的方法,并比较了不同大R角铜管对表面裂纹的影响,优化设计了结晶器,从而抑制铸坯脱方和表面裂纹。结果表明,在进行大R角铜管对220方坯表面质量优化实践中,合理控制脱方诱因以及有效控制铸坯表面裂纹可以稳定提升铸坯质量。

Practice on quality improvement of 220 square low carbon alloy steel billet

In order to study the influence of out of squareness and surface cracks on the quality of the slab, this paper adopts the methods of improving the matching of mold flux and steel grades, adjusting the distance between the water gaps of the mold and optimizing the secondary cooling process through theory and production practice. The effects of different Big R angle copper pipes on surface cracks were compared, and the mold was optimized to suppress cast-off and surface cracks. The results show that in the practice of optimizing the surface quality of 220 square billets with large R-angle copper tubes, rationally controlling the cause of out of squareness and effectively controlling the surface cracks of the billet can stably improve the quality of the billet.