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80 t LD-LF-CC工艺生产齿轮钢20CrMnTi时,[Al]s从0.030%降至0.015%可使吨钢成本降低25.8元。为不影响钢水洁净度,转炉出钢严格挡渣,出钢加入2 kg/t钢芯铝,同时加入CaO≥70%、SiO_2≤5%的高碱度渣进行渣洗,吹氩喂铝线使[Al]s为0.015%。LF精炼加入石灰块和AD粉(Al+Al_2O_3)对炉渣改质,然后喂Ca-Si线,软吹氩≥10 min。5炉试验结果表明,改进工艺后铸坯具有较高的洁净度,T[O](14～15)×10~(-6),[S] 0.012%～0.015%,[P]0.012%～0.018%。
80 t LD-LF-CC process Reducing the [Al] s from 0.030% to 0.015% in the gear steel 20CrMnTi reduced the cost per ton of steel by 25.8 yuan. In order not to affect the cleanliness of the molten steel, the converter steel slagging strict slag, tapping join 2 kg / t ACSR, while adding CaO ≥ 70%, SiO 2 ≤ 5% Let [Al] s be 0.015%. LF refining add lime block and AD powder (Al + Al_2O_3) on the slag modification, and then feed Ca-Si line, soft blowing argon ≥ 10 min. The results of the furnace tests show that the slab has higher cleanliness after the improvement of the process, and the T [O] (14-15) × 10-6, [0.012% -0.015%], [P] 0.012% 0.018%.