EAF-LF/VD-CC工艺生产压力容器钢的洁净度研究  

Research on Cleanliness of Pressure Vessel Steel Produced by EAF-LF/VD-CC Route

作　　者：唐海燕[1] 李京社[1] 杨树峰[1] 孙开明[1] 温德松[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁》2008年第1期30-32,54,共4页Iron and Steel

摘　　要：为了解天津钢管集团公司EAF-LF/VD-CC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10μm;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 12CrlMoVG produced by EAF-LF/VD-CC 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 （18-24） ×10^-6 in billet in average. The number of microinclusions less than 10μm in size was 3.53/ mm2 , which were mainly spherical calcium aluminate, aluminosilicate and compound inclusion of aluminate and sulphide. The macroinclusions were mainly ferrum-aluminum silicate, magnesium-calcium silicate, et al, which are formed during reoxidation, refractory erosion and slag entrainment in ladle and mold.

关 键 词：压力容器钢 连铸坯 洁净度 非金属夹杂物 

分 类 号：TG142.15[一般工业技术—材料科学与工程]