60t LF-VD精炼过程18CrNiMo7-6齿轮钢夹杂物的演变  

Evolution of Inclusions in Gear Steel 18CrNiMo7-6 during 60 t LF-VD Refining Process

作　　者：刘金鑫[1] 冯桂萍[1] 张龙[1] 顾文涛[1] 刘玉芬 

机构地区：[1]抚顺特殊钢股份有限公司技术中心,抚顺113001 [2]抚顺特殊钢股份有限公司中心试验室,抚顺113001

出　　处：《特殊钢》2016年第6期5-8,共4页Special Steel

摘　　要：18CrNiMo7-6钢（/%：0.17C,0.57Mn,0.24Si,0.012P,0.003S,1.70Cr,1.49Ni,0.28Mo）的冶金流程为60 t EAF-LF-VD-2.1 t铸锭。取样分析了EAF铝锭预脱氧,LF铝粒和碳化硅混合脱氧剂扩散脱氧（LF初渣成分/%：57～60CaO,20.5～22.0Al_2O_3,9.9～11.3SiO_2,8.8～10.6MgO,0.7～1.1FeO,0.7～0.9MnO）,VD后和软吹后钢中夹杂物数量、尺寸和组成的变化。结果表明,精炼过程1～10μm夹杂物数量降低16.67%,〉10μm夹杂物数量降低50%,≥30μm夹杂物基本去除;精炼过程中生成的夹杂主要为镁铝钙的复合夹杂物和CaS,MgS,MnS等硫化物;成品材中主要为Mg-Al的氧化物夹杂,硫化物以MgS为主,有少量MnS、CaS。应进一步优化冶炼工艺,控制中小型夹杂物的形成。The metallurgical flowsheet for steel 18CrNiMo7-6 （/% ： 0. 17C, 0. 57Mn, 0. 24Si, 0. 012P, 0. 003S, 1.70Cr, 1.49Ni, 0. 28Mo） is 60 t EAF-LF-VD-2. 1 t ingot. The variation of amount, size and ingredient of inclusions in steel after EAF aluminium pre-oxidation, LF aluminium shot and silicon-carbide mix deoxidant diffusion deoxidation （ LF initial slag ingredient/% ： 57 - 60CaO, 20. 5 ~ 22. 0Al2O3 , 9. 9 - 11.3SiO2 , 8.8 ~ 10. 6MgO, 0. 7 - 1.1FeO, 0.7 0. 9MnO） , VD and soft blowing has been analyzed by sampling. Results show that during refining process the amount of 1 - 10 p,m inclusions decreases by 16. 67% , the amount of 〉 10 p.m inclusions decreases by 50% and the ≥30 μm inclu- sions basically are removed from liquid; during refining process the main formed-inclusions are magnesium-aluminium-cal- eium compound inclusions and CaS, MgS and MnS etc sulfide; the main inclusions in finished products are Mg-A1 oxides and main sulfide is MgS with minor MnS and CaS etc sulfide. The further optimized steelmaking process is to control the formation of small and medium size inclusions.

关 键 词：18CrNiMo7-6齿轮钢 60 t LF-VD精炼 非金属夹杂物演变 分析 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TF76[金属学及工艺—金属材料]