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开展工业试验研究了二次氧化以及钙处理对超低氧特殊钢中非金属夹杂物的影响,研究结果表明:采用LD→LF→RH→CC工艺路线,通过铝脱氧、造高碱度精炼渣,可生产w(T.O)<0.000 7%的42CrMo特殊钢;钙处理虽有利于改善钢水浇铸性能,但将导致钢中大尺寸钙铝酸盐类夹杂物数量增加;二次氧化将导致液态CaO-MgO-Al_2O_3夹杂物向固态CaO-MgO-Al_2O_3夹杂物转变,同时导致Al_2O_3夹杂物和镁铝尖晶石夹杂物生成,对钢水洁净度不利。因此,生产超低氧特殊钢应尽量避免二次氧化和钙处理。
The industrial experiments were carried out to study the effects of secondary oxidation and calcium treatment on the non-metallic inclusions in ultra-low oxygen special steel. The results show that: using LD → LF → RH → CC process route, , Can produce 42CrMo special steel with w (TO) <0.000 7%. Although calcium treatment can improve the casting performance of molten steel, it will lead to the increase of the amount of large-size calcium aluminate inclusions in steel. Secondary oxidation will lead to the formation of liquid CaO -MgO-Al_2O_3 inclusions to the solid-state CaO-MgO-Al_2O_3 inclusions, resulting in the formation of Al_2O_3 inclusions and Mg-Al spinel inclusions, which is unfavorable to the cleanliness of molten steel. Therefore, the production of ultra-low oxygen special steel should try to avoid secondary oxidation and calcium treatment.