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为提高武钢薄板坯连铸连轧产线集装箱钢水洁净度,通过工业试验考察了LF精炼过程炉渣成分、软吹氩以及钙处理工艺对钢中T[O]和夹杂物的影响.试验结果表明,适当提高(CaO+MgO)/SiO2有利于降低钢中T[O],但同时要考虑(CaO+MgO)/Al2O3的比值,适当增加钙处理前后软吹氩时间可明显提高钢水洁净度;将炉渣中(CaO+MgO)/SiO2和(CaO+MgO)/Al2 O3控制在合适范围不仅有利于提高钢水洁净度,而且有利于钢中低熔点CaO--MgO--Al2 O3系夹杂物的生成.根据相关热力学数据给出了实际生产钢中生成不同液态铝酸钙时[Ca]--[Al]平衡热力学计算模型.
In order to improve the cleanliness of the molten steel in Wuhan WISCO thin slab continuous casting and rolling tankers, the effects of slag composition, soft blowing argon and calcium treatment process on T [O] and inclusions in steel were investigated through industrial experiments. (CaO + MgO) / SiO2 is beneficial to reduce T [O] in steel, but the ratio of (CaO + MgO) / Al2O3 should be considered at the same time. Appropriately increasing the soft argon blowing time before and after calcium treatment can obviously improve the cleanliness of molten steel. Controlling (CaO + MgO) / SiO2 and (CaO + MgO) / Al2O3 in the slag in the proper range will not only improve the cleanliness of the molten steel, but also be beneficial to the low melting point CaO - MgO - Al2O3 inclusions in the steel According to the relevant thermodynamic data, the thermodynamic calculation model of [Ca] - [Al] is given when different liquid calcium aluminates are produced in the actual production steel.