30t转炉-钢包吹氩-连铸生产A级船板钢中的非金属夹杂

Non-Metallic Inclusion in Grade A Hull Plate Steel Produced by 30 t Converter-Ladle Argon Stirring-Concasting Flowsheet

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。

The compound, size, amount and distribution 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 stirring - 150 mm ×1 050 mm slab concasting flowsheet have been analyzed and studied by electrolytic extraction analysis and scanning electron microscope （SEM）. Results showed that the inclusion in grade A hull plate steel 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.