超低碳钢RH高效脱碳工艺优化  

PROCESS OPTIMIZATION OF RH DECARBONIZATION OF ULTRA-LOW CARBON STEEL

作　　者：刘泳 李素芳 王鑫 张彩东 黄玉鹏 张庆宇 Liu Yong;Li Sufang;Wang Xin;Zhang Caidong;Huang Yupeng;Zhang Qingyu(HBIS Materials Technology Research Institute,Shijiazhuang 050023,Hebei;HBIS Digital Technology Co.,Ltd.,Shijiazhuang 050000,Hebei;Hot Rolling Division of HBIS Group Tangsteel Company,Tangshan 063600,Hebei)

机构地区：[1]河钢材料技术研究院,河北石家庄050023 [2]河钢数字技术股份有限公司,河北石家庄050000 [3]河钢集团唐钢公司热轧事业部,河北唐山063600

出　　处：《河北冶金》2024年第7期72-75,80,共5页Hebei Metallurgy

基　　金：河北省自然科学基金钢铁联合基金(E2019318013)。

摘　　要：针对IF钢过程中RH精炼周期较长的问题,研究了强制脱碳吹氧时机及脱碳终点时机对冶炼时长的影响。结果表明,吹氧时机提前至碳氧反应剧烈阶段,吹氧开始时间由真空循环260 s提前至180 s,脱碳时间从943 s降至860 s,提高了脱碳速率,缩短了脱碳周期。脱碳终点处,CO+CO_(2)含量在0.8%~2.0%之间时,RH精炼废气中CO+CO_(2)含量与钢水中碳含量呈明显的线性关系,碳含量随CO+CO_(2)含量的降低而减小。在保证终点碳含量小于15 ppm的内控条件下,CO+CO_(2)含量由0.8%~0.9%增至1.35%~1.40%时,脱碳周期由860 s降至803 s。通过优化强制脱碳吹氧时机及脱碳终点时机,RH循环脱碳时长由943 s降至803 s,缩短140 s。经过编程移植,开发的脱碳时间智能化模型与RH炉自身所带的激光废气分析仪相结合使用,有效缓解了RH脱碳过剩,提高了脱碳效率,同时为实现自动控制脱碳打下基础。Aiming at the long RH refining cycle in the process of producing IF steel,the effect of forced decarburization oxygen blowing time and decarburization terminal time on smelting time was studied.The results show that the oxygen blowing time is advanced to the intense stage of carbon oxygen reaction,the starting time of oxygen blowing is advanced from 260 s to 180 s in vacuum cycle,decarbonization time will be increased from 943 s to 860 s,the decarbonization rate is increased and the decarbonization time is shortened.At the end point of decarbonization,the content of CO+CO_(2)is between 0.8%~2.0%.There is an obvious linear relationship between CO+CO_(2)content in RH refining waste gas and carbon content in molten steel.The carbon content decreased with the decrease of CO+CO_(2)content.Under the internal control condition that the end carbon content is less than 15 ppm,when CO+CO_(2)content increased from 0.8%~0.9%to 1.35%~1.40%,decarbonization period decreased from 860 s to 803 s.By optimizing the timing of forced decarburization and the timing of the end point of decarburization,RH decarbonization time will be increased from 943 s to 803 s,shorten about 140 s.After programming and porting,the developed intelligent model of decarbonization time is combined with the laser exhaust gas analyzer carried by the RH furnace itself,which effectively alleviated the excess of RH decarbonization,improved the efficiency of decarbonization,and laid the foundation for the realization of automatic control decarbonization.

关 键 词：超低碳钢 吹氧 脱碳 CO+CO_(2) 精炼周期 

分 类 号：TF769.4[冶金工程—钢铁冶金]