高拉速薄板坯连铸中碳钢保护渣开发与应用

Development and application of mold flux for medium carbon steel in high speed thin slab continuous casting

针对在高拉速情况下薄板坯连铸过程中频繁出现"冷齿"、黏结以及铸坯表面纵裂纹较多等问题,依据中碳钢凝固收缩特性并结合现场实际生产情况,开发了一种适合在高拉速情况下薄板坯中碳钢连铸用保护渣。生产实践表明,在拉速提高后,使用新型保护渣基本避免了铸坯表面纵裂纹的产生,也无"冷齿"、黏结等报警现象出现,铸坯质量显著提高,完全满足生产要求。

In view of the frequent occurrence of"cold teeth",bonding and more longitudinal cracks on the slab surface in the process of thin slab continuous casting at high casting speed. According to the solidification shrinkage characteristics of medium carbon steel and the actual production situation in the field,a kind of mold flux suitable for thin slab medium carbon steel continuous casting at high casting speed was developed. The production practice showed that with the increase of casting speed,the longitudinal cracks on the slab surface were basically avoided by using the new mold flux,and there were no alarm phenomena such as"cold teeth"and bonding. The quality of the slab was improved remarkably,which fully met the production requirements.