转炉工艺冶炼40Cr钢的关键技术  

Key technologies of smelting 40Cr steel with converter

作　　者：赵东伟[1] 包燕平[1] 胡文豪[2] 金进文[2] 苏利川 马文俊[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]杭州钢铁集团技术中心,浙江杭州310022

出　　处：《炼钢》2012年第6期33-36,共4页Steelmaking

基　　金：国家自然科学基金资助项目(51074019)

摘　　要：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。To solve the problems of low cleanliness level and surface transverse cracks and longitudinal cracks of slab, the steelmaking process for 40Cr was optimized such as raising the content of carbon in molten steel, optimizing the deoxidation process and the composition of LF refining slag, selecting proper alloy and accessories and controlling reasonable calcium content. The industrial practice shows that by increasing the amount of A1 alloy deoxidizer and using the low nitrogen alloy materials the composition of LF refining slag can be controlled in the range of w（CaO） = 50 ^--55 ~,w（A1203） = 22~ ~26%,w（SiO2） = 10%~12%,w（MgO）= 5 %~8 % and w（Ca）/w（Al） controlled in the range of 0. 06~0. 18 and w（Ca）/w（S） controlled in the range of 0. 14~0. 36 after calcium treatment for 10 min in ladle and the mass fraction of T. O of slab controlled be- low 20 x 10-6 , and the mass fraction of nitrogen below 60 x 10-6. Furthermore, The pourability can be improved obviously.

关 键 词：转炉 40CR钢 洁净度 精炼渣 关键技术 

分 类 号：TF762.3[冶金工程—钢铁冶金]