轴承钢用精炼渣冶金性能分析

摘要

The reasonable refining slag was chosen for the refining process of the bearing steel making, and the ternary phase diagrams was used to study the change rule of the slag component. Then, the metallurgical performance was investigated. The results showed that the amount of CaO was stable, SiO2 decreased but Al2O3 increased slightly. Also the basicity increased during the refining process and maintained at the level of 4.5-5.0. The desulphurization capacity was 80%when the consumption of per ton steel was 9.31 kg synthetic slag and 2.79 kg arc-submerged slag. The results indicated that CaO-SiO2-Al2O3 refining slag system can remove the free oxygen and oxide inclusion quickly and the total oxygen content of rolled production is less than 12×10-6.%　　选择合理的三元精炼渣系，利用三元相图分析轴承钢GCr15钢包精炼过程中成渣组分的变化规律，并对钢包精炼过程中精炼渣的碱度和脱硫效果进行分析。结果表明：在精炼过程中，CaO含量基本不变，SiO2的含量略有减少，而Al2O3含量稍有增加；整个精炼过程中，碱度逐渐升高，在精炼结束后，终渣碱度维持在4.5～5.0；在吨钢用量9.31 kg合成渣和2.79 kg埋弧渣的条件下，精炼渣脱硫率达到80%；CaO-SiO2-Al2O3精炼渣系能够较好地去除钢中游离氧及氧化物夹杂，钢材的全氧含量低于12×10-6。