电渣重熔轴承钢中的硅元素烧损的控制  

Control of silicon element in bearing steel during electroslag remelting

作　　者：孙常亮[1] 周伟基[1,2] 李涛[1] 张晓磊[1] 侯栋[3] 

机构地区：[1]抚顺特殊钢股份有限公司技术处,辽宁抚顺113001 [2]大连高合金棒线材有限公司技术处,辽宁大连116105 [3]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《中国冶金》2015年第6期28-31,共4页China Metallurgy

摘　　要：以G20Cr2Ni4A轴承钢为研究对象,根据现场生产数据,对不同电极氧质量分数下的硅烧损、渣中不同SiO2质量分数下的硅烧损以及不同氩气流量下的硅烧损率进行了统计分析,研究了电渣重熔中不同保护气氛下以及不同工艺下对电渣锭硅质量分数的影响。结果表明:保护气氛电渣炉生产的电渣锭硅烧损小且成分均匀,当氧质量分数控制到0.001%下时,硅不易烧损;当采用非保护气氛冶炼G20Cr2Ni4A钢时,渣系中的SiO2质量分数在2%时能够保证硅的波动比较小,当采用保护气氛冶炼时,渣系中的SiO2质量分数在1%时对硅的控制效果良好;采用非保护气氛电渣炉,由于渣-气界面传氧以及电极氧化增重的不断变化,硅的烧损也呈增大趋势。针对于厂内30t保护气氛电渣炉,氩气流量增加到50L/min时,生产的电渣锭成分均匀,经济性良好。Taking G20Cr2Ni4A bearing steel as the research object,based on the production data of different wSiO2 , some data from the burning of Si in three situations were gathered,including different electrode under the oxygen content of Si burning,the Si loss under different wSiO2 in slag,and Si loss under different Ar gas flow rate.Accord-ing to the statistical analysis,the electroslag remelting under different protective atmosphere and under different process of electroslag ingot the effects of ωSi content were studied.The results show that the electroslag ingot Si damage under the production of the protective atmosphere electroslag furnace was small and well-distributed.When O content was under 0.001%,Si was not easy to be damaged;When using a non protective atmosphere electroslag furnace to smelt the G20Cr2Ni4A steel,wSiO2 at the rate of 2% in the slag could ensure that the Si fluctuation was relatively small;When adopting protective atmosphere electroslag furnace to smelting,ωSiO2 content at the rate of 1%in the slag had good control effect;When using a non protective atmosphere electroslag furnace,due to the slag gas interface oxygen-transfer and changing electrode oxidation weight,the loss of Si also showed a trend of increase.For 30 t protective atmosphere electroslag furnace in the factory,the argon gas flow increased to 50 L/min,the produc-tion of the electroslag ingot composition was uniform with good economical efficiency.

关 键 词：G20Cr2Ni4A轴承钢 保护气氛电渣炉 硅烧损 熔渣传氧机理 热力学 

分 类 号：TF142[冶金工程—冶金物理化学]