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美内陆钢铁公司板带厂近来研究了炼钢与冷轧带钢分层缺陷的关系,发现该缺陷主要是由钢中的非金属夹杂造成的,而结晶器保护渣进入浇注的钢水则是造成非金属夹杂的主要原因之一。以往的研究认为,非稳定浇注时,结晶器保护渣易于进入钢水。然而该公司发现在以下三种情况下,传统的保护渣仍有可能进入钢中而不被发觉。①当浇注参数波动很小不足引起铸坯质量控制数字模型发出警告时;②稳态浇注的情况下,结晶器内的不均匀流动在渣——钢界面形成旋流
The United States inland steel strip plant recently studied the relationship between steelmaking and cold-rolled strip delamination, found that the defect is mainly caused by non-metallic inclusions in steel, and mold flux into the pouring of molten steel is One of the main causes of non-metallic inclusions. Previous studies suggest that mold fluxes can easily enter the molten steel during unsteady casting. However, the company found that traditional mold fluxes could still enter the steel without detection under the following three conditions. ① When the pouring parameters fluctuations caused by a small number of slab quality control digital model issued a warning; ② steady state pouring, the mold non-uniform flow in the slag - steel interface swirl