Abstract: The effect of process parameters such as arc furnace end [C],refining slag,argon blowing,Als,shielding casting,liquid steel temperature and refractory material etc on occurred probability of Ds in CCr15 bearing steel and gear steel produced by 100t EBT DC EAF- 100 t LF/VD-300 mm × 340 mm billet process has been studied. The practice showed that with using higher end[C] (≥0. 10%C),refining slag basicity 2.5~3.5,≥15 min soft argon stirring after vacuum treatment,controlling Als 0.011%～0.020%,favorable shielding casting and using excellent refractory materials,it was available to decrease large size globular oxides inclusions in steel.

Key words: Refining, Bearing Steel, Gear Steels for Car, Globular Type Oxides

摘要： 研究了100 t EBT DC电弧炉-100 t LF/VD-300 mm×340 mm连铸坯生产GCr15轴承钢、齿轮钢时,电弧炉终点[C]、精炼渣、吹氩工艺、Als、保护浇铸、钢水温度及耐火材料等工艺参数对钢中Ds出现几率的影响。实践表明,采用较高的终点[C](≥0.10%)、精炼渣碱度2.5～3.5、真空后弱搅拌时间≥15 min、Als控制在0.011%～0.020%、良好的保护浇铸以及选用优质耐火材料等措施,可降低钢中大颗粒点状夹杂的出现几率。

关键词: 精炼, 轴承钢, 汽车齿轮钢, 点状氧化物夹杂