高级别车轮钢BOF-RH-CC工艺技术研究与实践  

Research and practice on “BOF-RH-CC” technology of high grade wheel steel

作　　者：刘延强 张丙龙 李向奎 乔焕山 田贵昌 姜敏[2] LIU Yanqiang;ZHANG Binglong;LI Xiangkui;QIAO Huanshan;TIAN Guichang;JIANG Min(Manufacture Division of Shougang Jingtang Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]首钢京唐钢铁联合有限责任公司制造部,河北唐山063200 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁研究学报》2021年第8期734-743,共10页Journal of Iron and Steel Research

基　　金：国家重点基础材料技术提升与产业化研发计划资助项目(2017YFB0304001)。

摘　　要：为了进一步提高生产效率、降低生产成本,同时减少大尺寸夹杂物超标,提出了采用"BOF-RH-CC"路线生产车轮钢工艺。通过系统地实验室试验与工业试验,研究了"BOF-RH-CC"工艺路线下的硫含量、温度以及夹杂物控制等关键技术问题。结果表明:在KR工序通过采用新型脱硫剂,可以将84%炉次的铁水硫的质量分数控制在10×10^(-6)以下;在转炉工序回硫主要影响因素为KR脱硫渣,当扒渣率为95%时,KR渣带硫量占入炉总硫量比例达到了26.7%,而当扒渣率在99%时,KR渣对转炉回硫仅占6.8%,应当保证KR处理后顶渣去除率控制在99%以上;在精炼RH工序当RH吹氧升温量不大于100 m^(3),不仅满足温度要求,同时也达到了洁净度的要求;在低氧条件下将夹杂物控制为高熔点且不易变形的CaS-Al_(2)O_(3)类夹杂,降低了钢种大尺寸夹杂的数量。通过上述研究,在"BOF—RH—CC"工艺路线下,可将成品钢中硫的质量分数和TO的质量分数分别控制在20×10^(-6)和12×10^(-6)以下,同时钢中大尺寸夹杂物数量降低了50%,满足钢种对硫含量、温度及夹杂物的要求,实现了该工艺的稳定控制。In order to further improve the production efficiency, reduce the production cost and reduce the excessive large-size inclusions, the "BOF-RH-CC" process was proposed to produce wheel steel. The key technical problems of sulfur content, temperature and inclusion control in "BOF-RH-CC" process were studied through systematic laboratory and industrial tests. The results show that the sulfur content of 84% heats can be controlled below 10×10^(-6) by using new desulfurizer in KR process;the main influencing factor of resulfurization is KR desulfurization slag in converter process. When the slag removal rate is 95%, the proportion of sulfur content in KR slag accounts for 26.7% of the total sulfur content in the furnace, while the proportion of sulfur content in KR slag only accounts for 6.8% of the total sulfur content in the converter when the slag removal rate is 99%, so it should be ensured that the top slag is removed after KR treatment, and the removal rate is controlled above 99%. When the heating amount during RH oxygen blowing is less than or equal to 100 m^(3) in RH refining process, both the temperature requirements and the cleanliness requirements are met;under low oxygen conditions, the inclusions are controlled as CaS-Al_(2)O_(3) inclusions with high melting point and not easy to deform, reducing the number of large-size inclusions in steels. Through the above research, under the "BOF-RH-CC" process route, the sulfur content and TO content in the finished steel can be controlled below 20×10^(-6) and 12×10^(-6), respectively, and the number of large-size inclusions in the steel can be reduced by 50%, which meets the requirements of steel grade for sulfur content, temperature and inclusions and realizes the stable control of the process.

关 键 词：车轮钢 脱硫剂 回硫 夹杂物 吹氧 升温 

分 类 号：TF76[冶金工程—钢铁冶金]