Abstract: The  compound,size,amount  and  distrbution  of non-metallic  inclusion  in  grade  A  hull  plate  steel (0. 16C,0.21Si,0.50Mn,0.011P,0.027S)produced   by   30   t   LD   converter   -ladle   argon   stiring- 150   mm×1050   mm  slab concasting flowsheet have been analyzed and studied by electrolytic extraction analysis and scanning electron micro scope(SEM).Results  showed that the  inclusion  in  grade A hull plate  stcel  included  silicate,alumina-silicate,sulphide and alumina-silicate-sulphide compound inclusion. The secondary oxidation of liquid steel and inclusion in steel from refractory materials counteract the metallurgical effect of argon blowing to remove inclusion in steel therefore to strengthen the ability of tundish removing inclusions could decrease large size inclusions in steel.

摘要： 用电解法和扫描电镜(SEM)分析研究30t顶吹氧气转炉-钢包吹氩-150mm×1050mm板坯连铸工艺生产的A级船板钢(%:0.16C、0.21Si、0.50Mn、0.011P、0.027S)中的非金属夹杂的组成、尺寸、数量和分布。结果表明,A级船板钢中的夹杂物包括硅酸盐、铝硅酸盐、硫化物以及铝硅酸盐-硫化物复合夹杂物。钢水二次氧化及耐火材料外来夹杂抵消了吹氩去除夹杂物的冶金效果。增强中间包去夹杂能力可减少钢中大尺寸夹杂物。

关键词: 转炉-钢包吹氩-连铸流程, A级船板钢, 非水溶液电解, 非金属夹杂物