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采用前期双渣法、高拉补吹法在210 t转炉上开展了高拉碳法冶炼高碳钢的大工业试验,出钢碳质量分数为0.04%~0.07%。对于非脱磷铁水冶炼高碳钢,脱磷是高碳出钢的关键环节。试验结果表明:前期双渣法5 min内可将铁水中磷的质量分数由0.078%~0.094%降至0.027%~0.038%;高拉补吹法在碳的质量分数为0.8%~1.1%时拉碳,钢水中磷的质量分数为0.014%~0.023%;这2种方法出钢钢水磷含量低,出钢后钢水回磷少,可以实现出钢时碳的质量分数为0.4%~0.7%,满足成品磷的质量分数小于0.015%。高碳条件下炉渣的高氧化性利于钢中磷的去除,实现高碳出钢。高拉碳法工业应用后,高碳钢平均出钢碳的质量分数由原来的0.22%提高到0.40%左右,钢中全氧的质量分数平均降低1.6×10-6,氮的质量分数平均降低5.1×10-6。
The large-scale industrial test of high-carbon smelting high-carbon steel was carried out on the 210 t converter by the pre-double-slag method and high-pressure blowing method. The mass fraction of tapping carbon was 0.04% -0.07%. For non-dephosphorized hot metal smelting high-carbon steel, dephosphorization is the key link of high-carbon tapping. The experimental results show that the mass fraction of phosphorus in molten iron can be reduced from 0.078% to 0.038% in 0.025% to 0.038% within 5 min in the previous double-slag process. When the mass fraction of carbon is between 0.8% and 1.1% Pull carbon, the mass fraction of phosphorus in the molten steel is 0.014% ~ 0.023%; the two methods have a low content of phosphorus in the molten steel and a small amount of phosphorus in the molten steel after the tapping, so that the mass fraction of carbon in the tapping can be 0.4% to 0.7% , To meet the finished product phosphorus content of less than 0.015%. The high oxidation of slag under high-carbon conditions is conducive to the removal of phosphorus in steel and the realization of high-carbon tapping. After high-carbon industrial application, the average mass fraction of high carbon steel from tapping increased from 0.22% to 0.40%, the content of total oxygen in steel decreased by 1.6 × 10-6 on average, and the average nitrogen content decreased 5.1 × 10-6.