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利用扫描电镜和能谱仪,对超低碳镀锌板表面起皮缺陷进行检测分析,结果发现起皮缺陷与基体明显分层,且分层处嵌有大量的Al2O3夹杂,Al2O3夹杂尺寸5~100μm。查找该缺陷对应铸坯的浇铸过程发现,对应铸坯浇铸过程SEN水口堵塞、塞棒上涨。结合前期对SEN水口堵塞物的综合分析得知,SEN水口堵塞主要是由于脱氧产生的Al2O3夹杂引起。针对脱氧产生的Al2O3夹杂,通过工艺优化,改善钢包顶渣改质效果,提高渣中w(CaO)/w(Al2O3)至2.3,RH脱碳终点氧质量分数由367×10-6降低至315×10-6,实现超低碳镀锌板表面起皮缺陷的有效控制,缺陷发生率由0.10%降低至0.01%以下。
Scanning electron microscopy and energy dispersive spectroscopy were used to test the surface skin defects on the ultra-low carbon galvanized sheet. The results showed that the skin defects were obviously delaminated from the matrix, and a large amount of Al2O3 inclusions were embedded in the delamination. 100 μm. Find the defect corresponding to the casting process Found that the corresponding Sten nozzle casting process blocked, stopper rod up. Combined with pre-SEN outlet blockage analysis, SEN nozzle blockage is mainly due to deoxidation caused by Al2O3 inclusions. According to the Al2O3 inclusions produced by deoxidation, the modification effect of the ladle top slag was improved through the process optimization. The content of w (CaO) / w (Al2O3) in the slag was increased to 2.3. The final oxygen content of RH decarburization was reduced from 367 × 10-6 to 315 × 10-6, to achieve ultra-low-carbon galvanized sheet surface peeling defects effectively control the incidence of defects from 0.10% to 0.01% or less.