120 t RH自然脱碳精炼低碳钢QD08的生产实践  

Production Practice for Low Carbon Steel QD08 Steelmaking by Natural Decarburization during 120 t RH Refining Process

作　　者：李海 刘列喜 张洪彪 介瑞华 王立青 陆曼 徐雷 Li Hai;Liu Liexi;Zhang Hongbiao;Jie Ruihua;Wang Liqing;Lu Man;Xu Lei(Steelmaking Division, Wuhu Xinxing Casting Pipe Co Ltd, Wuhu 241000)

机构地区：[1]芜湖新兴铸管有限责任公司炼钢部,芜湖241000

出　　处：《特殊钢》2018年第3期13-16,共4页Special Steel

摘　　要：基于生产数据对120 t RH精炼低碳钢QD08(/%:≤0.07C,0.15～0.35Si,0.25～0.45Mn,≤0.035P,≤0.035S)进行了RH碳氧反应的热力学、动力学分析和自然脱碳分析,得出RH精炼自然脱碳的优化工艺。结果表明,BOF终点温度≥1650℃,RH初始温度≥1 600℃,BOF终点[C]0.04%～0.10%,[P]≤0.018%,出钢前加顶浇石灰200 kg,出钢不加合金和脱氧剂,RH真空度4～8 kPa,6～8 min可使钢水[C]≤0.05%。Based on the production data the analysis on thermodynamics, kinetics of RH carbon-oxygen reaction and natural decarburization in 120 t RH refining process of low carbon steel QD08 （/% ：≤0.07C, 0. 15 ～0. 35Si, 0.25 ～ 0. 45Mn, ≤0. 035P, ≤0. 035S） has been carried out to get the optimized process for RH refining natural decarburization. The results show that with BOF end temperature ≥1 650 ℃, RH initial temperature of liquid ≥ 1 600 ℃, BOF end [ C ] 0. 04% ～ 0. 10%, end [ P] ≤0. 018%, before BOF tapping adding top slag lime 200 kg and during tapping non-adding alloy and deoxidation agent, and RH vacuum 4 -8 kPa for 6 ～ 8 min, the liquid [ C] shall decrease to ≤0. 05%.

关 键 词：QD08低碳钢 RH精炼 自然脱碳 热力学 脱碳速率 

分 类 号：TF769[冶金工程—钢铁冶金]