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西宁特钢的GCr15轴承钢连铸坯由90 t UHP Consteel EAF-LF(VD)-CC流程生产。通过全程保护浇铸,钢中平均氧含量减少3.15×10~(-6);控制钢水过热度≤20℃,拉速0.7～0.8 m/min,二次冷却比水量0.40 L/kg,铸坯平均等轴晶率≥60%,且铸坯质量明显提高;在上述优化工艺参数下,采用3.25 Hz/250 A结晶器电磁搅拌和20 Hz/300 A凝固末端电磁搅拌,铸坯中心碳偏析指数为0.99～1.20。
Xining Special Steel GCr15 bearing steel billets produced by the 90 t UHP Consteel EAF-LF (VD) -CC process. The average oxygen content in the steel decreased by 3.15 × 10 -6 during the full protection of the casting. The superheat of the molten steel was controlled at ≤20 ° C, the pulling speed was 0.7-0.8 m / min, the secondary cooling specific water was 0.40 L / kg, The equiaxed grain rate is more than or equal to 60%, and the quality of the billet is obviously improved. Under the optimized process parameters, the center carbon segregation index of the billet is 3.25 Hz / 250 A by electromagnetic stirring and 20 Hz / 300 A by solidification end electromagnetic stirring 0.99 ~ 1.20.