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针对攀钢连铸 Q2 35 G等包晶钢生产中出现的铸坯表面裂纹问题 ,在调查分析裂纹特征及其产生原因的基础上 ,发现保护渣传热过强和保护渣流入不均是诱发角横裂产生的主要原因。通过对保护渣结晶特性的研究 ,开发出了低碱度 (Ca O/ Si O2 <1.0 )、高结晶率的新型包晶钢用连铸保护渣。工业试验表明 ,研制的保护渣具有良好的使用效果 ,所浇铸坯表面质量优良 ,铸坯裂纹较少 ,表面角横裂发生率降低到 4 .19% ,纵裂发生率为 3.4 2 % ,且保护渣润滑作用良好 ,未发生漏钢事故。
Aiming at the surface crack of slab appearing in the production of peritectic steel such as Q235 G of Panzhihua Iron and Steel, based on the investigation of the crack characteristics and the causes, it was found that the excessive heat transfer of the flux and the uneven influx of mold flux were induced The main reason for the corner cracks. Based on the research on the crystallization characteristics of mold fluxes, the mold powder for continuous casting with low basicity (CaO / Si O2 <1.0) and high crystallinity has been developed. Industrial tests show that the developed slag has a good effect, surface quality of cast slabs is good, slab cracks are less, the incidence of surface angle transverse cracking is reduced to 4.19%, the longitudinal cracking rate is 3.4 2%, and Slag lubrication good effect, there is no breakout accident.