摘要
通过对SPHC连铸板坯表面及皮下夹渣的光学显微镜观察和扫描电镜能谱分析,研究了连铸板坯表面及皮下夹渣的分布、类型、成分特点,探讨了表面及皮下夹渣的形成机理。结果表明:SPHC连铸板坯表面及皮下夹渣按分布特征可以分为Ⅰ、Ⅱ、Ⅲ和Ⅳ4种类型,各种类型的夹渣的形成机理各不相同;保护渣卷渣和水口沉积物脱落的大型脱氧产物是连铸坯表面及皮下夹渣的主要来源。提高钢水洁净度、保持连铸状态的稳定性、减小结晶器液面波动,或提高结晶器保护渣熔渣层的抗波动能力等措施,有助于减少板坯表面及皮下夹渣的发生率。
The distribution,type,composition and formation cause of slag inclusions on the surface and subsurface of continuous casting SPHC slabs had been researched and discussed through observing metallographic samples by optical microscope,SEM and energy spectrum analysis.The results showed that,the slag inclusions could be classified into four characteristic types with different formation mechanism.Slag entrapment of continuous casting mould powder and big-size deoxidation products dropped out from submersed nozzle sediments were the principal source of slag inclusions in continuous casting SPHC slabs.Raising the cleanliness of molten steel,maintaining the stability of continuous casting,alleviating the fluctuation of liquid level in mould,strengthening the anti-fluctuating ability of molten slag layer were helpful to reduce the incidence of slag inclusions in continuous casting slabs.
出处
《炼钢》
CAS
北大核心
2018年第1期36-43,共8页
Steelmaking
关键词
连铸板坯
表面夹渣
皮下夹渣
保护渣
continuous casting slab
surface slag inclusions
subsurface slag inclusions
mould powder
