120tLF精炼过程搅拌强度对Q195低碳钢中大尺寸夹杂物数量的影响  

Influence of 120 t LF Stirring Intensity on Amount of Large Size Inclusions in Low Carbon Q195 Steel during Refining

作　　者：蒋鲤平 徐建飞 于飞 屈志东 Jiang Liping;Xu Jianfei;Yu Fei;Qu Zhidong(Zenith Steel Group Co Ltd,No.3 Steelmaking Plant,Changzhou 213011)

机构地区：[1]中天钢铁集团有限公司第三炼钢厂,常州213011

出　　处：《特殊钢》2021年第4期47-50,共4页Special Steel

摘　　要：采用"120 t BOF→LF→Ca处理→160 mm×160 mm CC"工艺生产的Q195钢。示踪检验得出,当LF精炼过程氩气流量在300~600 L/min时,50×400 mm2检验面积中,铸坯中≥27μm大尺寸夹杂物31个,主要来源于LF精炼渣卷渣、钙处理生成的CaS、水口内壁材质剥落和钢中内生大尺寸钙铝酸盐夹杂物,其中由LF精炼渣卷渣形成的大尺寸夹杂物所占比例为29.1%。通过精炼全程将氩气流量由300~600 L/min降低至100 L/min,发现可以显著降低精炼渣卷渣形成的大尺寸夹杂物数量,同样的检测面积≥27μm夹杂物降至19个。The Q195 steel is produced by "120 t BOF→LF→Ca addition→160 mm ×160 mm CC" process.It was found by tracing test that the number of ≥27 μm large size inclusions at test area 50 × 400 mm2 in the billet is 31 and generated by LF top slag entrapped during gas stirring,calcium treatment formed CaS,submerged entry nozzle material stripped and formed endogenous large size calcium-aluminate inclusion in steel as the flow rate of argon is in the range of300~600 L/min.The proportion of LF top slag entrapped is about 29.1% in all the large size inclusions.As the flow rate of argon decreases from 300~600 L/min to 100 L/min,it is found that the LF top slag entrapped could be significantly decreased,at some test area the ≥27 μm inclusions number decreases to 19.

关 键 词：120tLF 大尺寸夹杂物 精炼渣卷渣 氩气搅拌强度 

分 类 号：TF769[冶金工程—钢铁冶金]