Abstract: According to the surface defect occurred at lower part of ESR ingot of 521 steel (/% : 0. 37 ~ 0. 45C, 0. 80 ~ 1. 15Si, 4. 50 ~5. 30Cr, 1. 20 ~ 1. 40Mo, 0. 85 ~ 1. 10V) and GCr15 steel (/% : 0. 97C, 1. 57Cr) melted by ESR furnace with double electrode, the effect of binary slag amount, lower part remelting voltage and current as well as remelting time on surface quality of 2. 5 ~ 5 t ESR ingot has been statistically analyzed. Results show that control remelting time (remelting rate) has obvious effect on surface quality of ESR ingot: for 5 1521 steel remelting ingot, with slag amount 200 kg, voltage 55 V and current 15 500 ~ 16 800 A in melting at ingot lower part, as total remelting time is 434 ~489 min, the ingot surface is smooth, while the total remelting time is 500 min, there is 15 mm depth slag scar at ESR ingot lower part； for 2. 5 t GCr15 steel remelting ingot, with slag amount 120 kg, voltage 43 ~44 V and current 13 500 ~ 14 000 A in melting at ingot lower part, as the total remelting time is 316 ~ 359min, the surface of ingot is smooth while the total remelting time is 380 min, the ESR ingot lower part has 7 mm depth slag runner and slag inclusion.

摘要： 根据双臂电渣炉冶炼的521钢(/%:0.37~0.45C,0.80~1.15Si,4.50~5.30Cr,1.20~1.40No,0.85~1.10V)和GCr15钢(/%:0.97C,1.57Cr)电渣锭下部出现的表面缺陷,统计分析了70CaF₂-30Al₂O₃二元渣量、下部冶炼电压和电流以及重熔时间对2.5~5 t电渣锭表面质量的影响。结果表明,控制重熔时间(重熔速率)对电渣锭的表面质量有较大影响:5 t 521钢锭渣量200kg,钢锭下部重熔电压55 V,电流15 500~16 800 A,总重熔时间为434~489 min时,钢锭表面光滑,总重熔时间500 mim时,电渣锭下部有厚15 mm的渣疤;2.5 t GCr15钢锭渣量120kg,下部重熔电压43~44 V,电流13 500~14000 A,总重熔时间316~359 min,钢锭表面光滑,总重熔时间380 min,电渣锭下部有7mm深渣沟和夹渣。

关键词: 2.5 ~5t电渣锭, 521钢, GCr15钢, 重熔时间, 表面质量