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近来,美国内陆钢铁公司板带厂研究了炼钢与冷轧带钢的分层缺陷的关系,发现该缺陷主要由钢中的非金属夹杂造成,而结晶器保护渣进入浇注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,非稳态浇注时,结晶器保护渣易于进入钢水。然而该公司发现,在以下3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学模型发出警告时;2)稳态浇注
Recently, the United States inland steel company strip plant steel and cold-rolled strip stratification of the relationship between the defects found mainly by the non-metallic inclusions in the steel caused by the mold flux into the pouring of molten steel is caused One of the main reasons for non-metallic inclusions. Past research suggests that mold powder is easy to enter the molten steel during unsteady casting. However, the company found that in the following three cases, the traditional mold powder is still likely to enter the steel without being noticed. 1) Steady state casting when the casting parameters fluctuate little enough to cause a warning on the mathematic model of slab quality control;