摘要
以抽锭式电渣重熔304NG不锈钢用Ca F_(2)-Al_(2)O_(3)-Ca O-Mg O-Si O_(2)渣系为研究对象,基于分子离子共存理论(IMCT)和Wagner-Chipman模型进行脱氧热力学研究,分析不同脱氧制度对钢中O、Al、Si及渣中FeO质量分数的影响。研究结果表明,在无脱氧剂条件下,钢中的Al、Si先后被渣中的FeO氧化,平衡时Al的氧化率为61.3%、Si的氧化率为9.7%,而O的增加量为75.1%;当采用Al,CaSi,Al+CaSi脱氧时,渣中FeO质量分数分别能降低至0.12%,0.24%,0.10%;与单独使用Al,CaSi相比,Al+CaSi复合脱氧剂不仅具有良好的氧势控制能力,而且钢中Al、Si相对于电极原始质量分数变化幅度较小;在电渣重熔过程中,钢中O的质量分数由Al-O平衡决定。
Based on the ion and molecule coexistence theory(IMCT)and the Wagner-Chipman model,the deoxidation thermodynamics of the CaF_(2)-Al_(2)O_(3)-CaO-MgO-SiO_(2) slag system used for the drawing-ingot-type electroslag remelting of 304NG stainless steel was studied.The effects of different deoxidation systems on the mass fractions of O,Al and Si in steel,as well as FeO in slag were analyzed.The results show that under the condition of no deoxidizer,Al and Si in steel are successively oxidized by FeO in slag,resulting in an oxidation rate of 61.3%for Al and 9.7%for Si at equilibrium,while O increases by 75.1%.When Al,CaSi and Al+CaSi are used for deoxidation,the mass fraction of FeO in the slag can be reduced to 0.12%,0.24%and 0.10%,respectively.Compared with using Al and CaSi individually,the Al+CaSi composite deoxidizer not only exhibits a superior ability to control the oxygen potential,but also demonstrates a smaller variation range of Al and Si relative to the initial mass fraction of the electrode.In the electroslag remelting process,the mass fraction of O in steel is determined by Al-O balance.
作者
李作伟
耿鑫
姜周华
刘福斌
LI Zuowei;GENG Xin;JIANG Zhouhua;LIU Fubin(School of Metallurgy,Northeastern University,Shenyang 110819,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第11期4273-4282,共10页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(52174304)
中央高校基本科研业务费专项资金资助项目(N2225040)。
关键词
电渣重熔
304NG
渣系
脱氧热力学
Al-O平衡
electroslag remelting
304NG
slag system
deoxygenation thermodynamics
Al-O equilibrium
