BOF-LF-CC生产特殊钢连铸坯质量控制

Controlling on the quality of special steel billet produced by BOF-LF-CC process

采用BOF-LF(VD)-CC流程生产的连铸坯的质量对最终产品性能有很大影响。文章就生产流程中转炉终点碳的控制、脱氧制度和夹杂物控制、钢水的成分和精炼渣成分的控制以及铸坯内部缺陷的控制等问题进行了讨论。指出采用该流程生产合格质量的特殊用途中、高碳钢连铸坯要满足:钢的成分波动范围要窄,钢的洁净度要高(w(T.O)=20×10-6左右),铸坯内部中心区要致密(疏松、缩孔要小),铸坯中心元素(C、Mn、S、P)偏析要小。根据国内外厂家实际生产证明,在生产流程中采用合适的工艺技术完全可以达到上述要求,获得很好的冶金效果。

Quality of finished steel product were effected by billet quality produced by BOF-LF-CC process. In this paper, [C] controlling in BOF, deoxidization and inclusions controlling, molten steel composition, top slag controlling and billet Internal quality were analyzed by anther experience and references. The demand of special for middle/high carbon strand must be content as follow us. the molten steel composition controlling in a narrow rang, molten steel being clean（T. O about 20 × 10^-6）, billet Internal steel qualing free defect （minimized shrinkage）, billet centre element （C, Mn, S, P） segregation should be minimizing. According to the practice production of home and abroad, the demand mentioned above can be met by reasonable technology in BOF-LF （VD）-CC process.