为了解天津钢管集团公司EAFLF/VDCC工艺生产压力容器钢12Cr1MoVG的洁净度水平，通过系统取样、示踪剂追踪、综合分析等方法，对LF处理前后、中间包钢水和连铸坯中总氧、显微夹杂及大型夹杂物的数量及变化情况进行了全面研究。结果表明，LF/VD精炼后钢液w(T［O］)平均为15×10-6，中间包为17×10-6，铸坯为（18~24）×10-6，其中头坯＞尾坯＞连浇坯＞正常坯。铸坯中的显微夹杂物数量是3.53个/mm2,主要为球形钙铝酸盐、硅铝酸盐和铝酸盐与硫化物的复合夹杂，90%以上的夹杂物尺寸小于10 μm；铸坯中大型夹杂物有铁铝硅酸盐、钙镁硅酸盐等,来源于钢的二次氧化、钢包卷渣、耐火材料侵蚀、结晶器卷渣等。
In order to study the cleanliness of pressure vessel steel 12Cr1MoVG produced by EAFLF/VDCC route at Tianjin Pipe Company Ltd., the change of total oxygen (w(T［O］)), microinclusion and macroinclusion content in the liquid steel through the process was measured systematically,with tracers and comprehensive analysis of samples. The results showed that in experimental heats the w(T［O］) was 15×10-6 after LF/VD refining and 17×10-6 in tundish, and (1824)×10-6 in billet in average. The number of microinclusions less than 10 μm in size was 353/mm2, which were mainly spherical calcium aluminate, aluminosilicate and compound inclusion of aluminate and sulphide. The macroinclusions were mainly ferrumaluminum silicate, magnesiumcalcium silicate, et al, which are formed during reoxidation, refractory erosion and slag entrainment in ladle and mold.
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