CO_(2)-CO气氛对3.5%Si硅钢脱碳效果影响  

Effect of CO_(2)-CO atmosphere on decarbonization of 3.5%Si silicon steel

作　　者：钱娜 艾立群 洪陆阔 孙彩娇 周美洁 佟帅 孙伶艳 陈建松 QIAN Na;AI Liqun;HONG Lukuo;SUN Caijiao;ZHOU Meijie;TONG Shuai;SUN Lingyan;CHEN Jiansong(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《钢铁研究学报》2025年第3期346-356,共11页Journal of Iron and Steel Research

基　　金：河北省自然科学基金资助项目(E2024209074)。

摘　　要：采用短流程工艺,用CO_(2)-CO气氛制备超低碳硅钢,试验以厚度为0.5mm Fe-0.1%C-3.5%Si(质量分数)合金薄带为研究对象,通过热力学软件计算Fe-C-Si合金薄带的热力学平衡相图,开展在CO_(2)-CO气氛下固态脱碳试验。结果表明:温度在800~1300℃、P_(CO_(2))/P_(CO)(CO_(2)、CO分压比)的值低于0.22时,合金薄带表面优先生成SiO 2;表面XRD物相分析与热力学结果分析作对比,其结果基本一致。当P_(CO_(2))/P_(CO)=0.08时,脱碳10min后碳质量分数为0.00597%脱碳效果较佳;脱碳温度1150℃,脱碳25min后,碳质量分数为0.00262%,脱碳效果较好,符合超低碳硅钢的碳含量的要求;Fe-0.1%C-3.5%Si合金薄带厚度越薄,脱碳速率越快,氧化层生长速度也越快。通过对动力学的研究计算可得,不同厚度下Fe-0.1%C-3.5%Si合金薄带平均碳含量随时间变化呈指数关系;1mm厚的Fe-0.1%C-3.5%Si合金薄带气固反应脱碳可近似为表观一级反应,表观脱碳速率常数k可近似为0.08349。Ultra-low carbon silicon steel was prepared using a short process technology in a CO_(2)-CO atmosphere.Theexperiment focuses on a thin strip of Fe-0.1%C-3.5%Si alloy with a thickness of 0.5 mm.The thermodynamic equilibrium phase diagram of Fe-C-Si alloy thin strip was calculated through thermodynamic softw are and solid-state decarburization experiments in CO_(2)-CO atmosphere were conducted.The results show thatwhen the temperature is between 800℃and 1300℃and the P_(CO_(2))/P_(CO) value is lower than 0.22,SiO_(2) is prefe rentially generated in the cross-section of the thin strip.The comparison between surface XRD phase analysis andthermodyna mic analysis shows that the results arebasically consistent.When P_(CO_(2))/P_(CO)=0.08,the decarbo nizationeffect is better when the carbon content is 0.00597 wt.%after 10 min of decarbonization.The carb oncontent after decarburization at 1150℃for 25 min is 0.00262 wt.%,indicating good decarburization effect andm eeting the carbon content requirements of ultra-low carbon silicon steel.The thinner the Fe-0.1%C-3.5%Si alloyribbon thickness,the faster the decarburization rate and the faster the growth rate of the oxide layer.Calcul ationsfrom the study of the kinetics show that the average carbon content of Fe-0.1%C-3.5%Si alloy thin strip swith different th icknesses varies exponentially with time;the decarburization of Fe-0.1%C-3.5%Si alloy thinstrips of 1mm inthickness by gas-solid reaction can be approximated as an apparent first-order reaction,and the apparent decarburization rate constant k can be approximated as 0.08349.

关 键 词：Fe-0.1%C-3.5%Si合金 固态脱碳 CO_(2)-CO 氧化层 动力学 

分 类 号：TF746[冶金工程—钢铁冶金]