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针对杭州钢铁集团转炉炼钢厂生产的铸坯洁净度水平较差、表面横裂纹以及纵裂纹等问题,以40Cr为试验钢种,采取了提高钢水出钢终点碳含量、优化脱氧制度和精炼渣系、选用合适的合金及辅料、合理控制钙含量等改进措施。研究结果表明:加大出钢铝脱氧剂用量,选用低氮的合金原料,LF精炼渣系成分控制在w(CaO)=50%～55%,w(Al2O3)=22%～26%,w(SiO2)=10%～12%,w(MgO)=5%～8%;钙处理10 min后大包钢液w(Ca)/w(Al)=0.06～0.18、w(Ca)/w(S)=0.14～0.36;铸坯w(T.O)<20×10-6,w(N)<60×10-6;钢水可浇性良好。
In view of the problems of poor cleanliness, surface transverse cracks and longitudinal cracks produced by the converter steelmaking plant of Hangzhou Iron and Steel Group, 40Cr is taken as the test steel, the carbon content at the end of tapping of molten steel is improved, the deoxidation system and refined slag are optimized Department, the selection of suitable alloys and accessories, reasonable control of calcium content and other improvements. The results show that the composition of LF refining slag is controlled at 50% ~ 55% of w (Al2O3), 22% ~ 26% of w (Al2O3), w (Ca) / w (Al) = 0.06 ~ 0.18, w (Ca) / w (Mg) = 5% ~ 8% (S) = 0.14 ~ 0.36; castings w (TO) <20 × 10-6, w (N) <60 × 10-6;