论文部分内容阅读
我厂在使用GGW-0.15中频感应电炉酸性法冶炼中碳钢和低合金钢时,由于对其冶炼特点认识不足,操作不当,在生产ZG30CrNiMo的熔模铸件过程中,在一段时间内钢水含硅量在0.55～0.63％,超过部颁标准(该钢号化学成分为:C0.28～0.35％;Mn0.50～0.80％;Si0.17～0.37％;Cr1.30～1.60％;Ni1.30～1.60％;Mo0.20～0.30％;P≤0.04％;S≤0.04％),致使产品报废。一、含硅量高的原因熔炼前对炉衬进行了修复,在熔化过程中,由于没有及时把炉料捣入熔池,使得下部钢水处在强烈沸腾状态,严重损坏了新修的炉衬,致使有的炉衬呈块状浮起。在全部炉料熔化完毕后,炉渣很稠,而且大部分为黑色,少量呈豆绿色。稍微扒去些一炉渣后,升温到1480℃左右(光学高温计读数,
I plant in the use of GGW-0.15 IF induction furnace smelting medium carbon steel and low alloy steel, due to lack of understanding of the characteristics of its smelting, improper operation, in the production of ZG30CrNiMo investment casting process, in a period of time molten steel containing silicon The amount of 0.55 ~ 0.63%, exceeding the ministerial standards (the steel chemical composition: C0.28 ~ 0.35%; Mn0.50 ~ 0.80%; Si0.17 ~ 0.37%; Cr1.30 ~ 1.60%; Ni1.30 ~ 1.60%; Mo0.20 ~ 0.30%; P≤0.04%; S≤0.04%), resulting in product scrap. First, the reason for the high silicon content before smelting lining repair, in the melting process, because there is no timely pound charge into the pool, making the lower part of the molten steel in a strong boiling state, seriously damaged the newly repaired lining, resulting in a The lining is lumpy. After all the charge has been melted, the slag is very thick and mostly black with a small amount of beige green. Slightly after a few pieces of slag to heat up to about 1480 ℃ (optical pyrometer readings,