摘要
为了实现BOF+RH+CC工艺路线对超低碳钢的高效化生产,必须快速将IF钢碳质量分数脱到钢种要求范围内。通过热力学计算制定合理的脱碳结束氧控制范围,在RH生产超低碳钢过程中,脱碳结束时氧要控制在0.03%~0.04%范围内。结合废气分析仪进行RH脱碳的动力学分析,RH脱碳过程分三个阶段,第一阶段为真空处理的0~4 min,第二阶段为真空处理的5~12 min,第三阶段为真空处理的13 min以后。为实现高效脱碳,RH真空处理0~4 min时,提升气体流量设定为120~140 Nm^3/h,真空处理5~10 min时,提升气体流量设定为160~180 Nm^3/h,真空处理11 min以后,提升气体流量设定为190~210 Nm^3/h。脱碳结束判断依据为CO曲线降低至2.5%以下且真空处理时间≥14 min。
In order to produce ultra-low carbon steel eficiently by BOF+RH+CC process,the carbon content of IF steel must be quickly removed to the required range of steel grade.The reasonable oxygen control range at the end of decarburization was worked out by thermodynamic calculation.During the production of ultra-low carbon steel by RH,the oxygen content should be controlled in the range of 0.03%~0.04%.The dynamic analysis of RH decarburization process was carried out with exhaust gas analyzer.The RH decarburization process was divided into three stages:the first stage was 0~4 min of vacuum treatment,the second stage was 5~12 min of vacuum treatment,and the third stage was 13 min and after.In order to achieve efficient decarburization,the lifting gas flow rate is set at 120~140 nm^3/h when RH vacuum treatment is0~4 min,160~180 nm^3/h is set when vacuum treatment is 5~10 min,and 190~210 nm^3/h is set after 11 min vacuum treatment.The end of decarburization was judged by the reduction of CO to less than 2.5%and vacuum treatment time≥14 min.
作者
胡晓光
付尚红
李应江
HU Xiaoguang;FU Shanghong;LI Yingjiang(No.4 Steelmaking and Rolling General Plant,Mahans han Iron and steel Cod.,Ltd.,Mahans han 243000,China;Energy Control Center of Ma Steel,Mahans han 243000,China)
出处
《金属材料与冶金工程》
CAS
2020年第4期38-41,共4页
Metal Materials and Metallurgy Engineering
关键词
RH处理
脱碳
热力学
动力学
RH treatment
decarburization
thermodynamics
dynamics
