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

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.