优化脱氧工艺提高38CrMOAl钢连浇成功率  

Increasing Continuous-Continuous Casting Success Rate of Steel 38CrMoAI by Optimizing Deoxidation Process

作　　者：周伟基[1] 薄永明 吉海峰[1] 潘利[1] 战东平[2] 

机构地区：[1]抚顺特殊钢股份有限公司技术中心,抚顺113001 [2]东北大学材料与冶金学院,沈阳11004

出　　处：《特殊钢》2012年第5期40-42,共3页Special Steel

摘　　要：研究了连铸38CrMoAl钢(/%:0.35～0.42C、0.20～0.45Si、0.30～0.60Mn、1.35～1.65Cr、0.15～0.25Mo、0.70～1.10Al)夹杂物类型和形成原因。通过优化脱氧制度:提高60 t EAF终点[C]≥0.010%,保持高碱度渣(R≥2.5),出钢前2～3 min向熔池喷吹碳粉,控制(FeO),出钢过程减少Si-Fe加入量;LF喂铝线并用铝粒扩散脱氧,采用(/%)50～60CaO、10～15SiO_2、15～20Al_2O_3、≤0.7(FeO+MnO)、≤5MgO高碱度渣;做好VD后保护浇铸,有效地降低钢中Al_2O_3类型非金属夹杂物。结果表明,优化工艺后38CrMoAl钢连浇炉数达到9炉,夹杂物废品率≤1%。The types and formation cause of inclusions in casting steel 38CrMoAl （/%： 0. 35 -0.42C, 0. 20 -0.45Si, 0. 30 -0. 60Mn, 1.35 - 1.65Cr, 0.15 -0. 25Mo, 0. 70 - 1. 10Al） are studied. By optimizing deoxidation tech- nique including increasing 60 t EAF end [ C] ≥10. 010% and maintaining high basicity slag （R≥2. 5） , injecting carbon powder in bath before tapping for 2 - 3 rain and controlling （FeO） , decreasing adding Si-Fe amount during tapping ; in LF refining process feeding aluminium wire and using aluminium shot for diffusion deoxidation, using high basicity refining slag （/% ： 50 -60CaO, 10 -15SIO2, 15 -20Al2O3,≤0. 7（FeO＋MnO）, ≤5MgO） ; and doing best shielding casting after VD process, the Al2O3 types non-metallic inclusions in steel is effectively decrease. Results show that with optimum process the continuous-continuous castin heats of steel 38CrMoAl are up to 9 heats, the rejection rate for inclusions is ≤1%.

关 键 词：EAF-LF-VD-CC流程 38CRMOAL钢 脱氧 夹杂物 连续浇铸炉数 

分 类 号：TF777[冶金工程—钢铁冶金]