防止含钛焊丝钢GF50-G水口结瘤的生产实践  

Production Practice of Preventing Nozzle Clogging for Casting Ti-Bearing Welding Wire Steel GF50-G

作　　者：杨咏阶 刘玉爱 张向勇 Yang Yongjie;Liu Yuai;Zhang Xiangyong(Technology Center, Shandong Guangfu Group Co Ltd, Binzhou 256217;Engineering Research Center of Large Size Alloy Structural Steel Bars of Shandong Province, Bingzhou 256217)

机构地区：[1]山东广富集团有限公司技术中心,滨州256217 [2]山东省大规格合金结构钢棒材工程技术研究中心,滨州256217

出　　处：《特殊钢》2018年第3期9-12,共4页Special Steel

摘　　要：含钛焊丝钢GF50-G(/%:0.08C,0.83Si,1.55Mn,0.014P,0.012S,0.19Ti)生产流程为80 t顶底复吹转炉-LF-160 mm×160mm方坯连铸,在浇注过程中经常出现水口结瘤现象。扫描电镜和能谱仪对水口结瘤物的分析得出,结瘤物主要物相为Ti02。水口结瘤的热力学计算表明,为避免钛脱氧产物被[Al]还原形成铝钛系夹杂物,应控制[Als]在0.008%以下。根据生产实践,将中间包钢水温度从1542℃提高至1 550℃控制[Alt]≤0.010%、加钛铁前使[O]≤15×10^(-6)、减少钢水的二次氧化能够防止水口结瘤、连浇炉次从3～4炉提高到8～10炉。The production flowsheet of Ti-bearing welding wire steel GF50-G （/% ： 0. 08C, 0. 83Si, 1.55Mn, 0. 014P, 0. 012S, 0. 19Ti） is 80 t top and bottom combined blowing converter-LF-160 mm × 160 mm billet casting, and the phenomenon of nozzle clogging often occurs in casting process. It is obtained by analysis of SEM and EDS on nozzle clog- ging deposit that the main phase in deposit is TiO2. The thermodynamic calculation of nozzle clogging deposit shows that the Al content in liquid steel-[ Als] should be controlled less than 0. 008% in order to avoid Ti-deoxidized products being reduced by [ Al ] and forming aluminium-titanium inclusions. Based on production practice with increasing temperature of liquid steel in tundish from 1 542 ℃ to 1 550 ℃, controlling [ Ah] ≤0. 010%, [O]≤15×10^-6 before adding ferrotitanium and decreasing reoxidation of liquid steel the nozzle clogging could be prevented, and the continuous casting heats may in- crease from 3 ～ 4 heats to 8 ～ 10 heats.

关 键 词：含钛焊丝钢GF50-G 水口结瘤 TIO2 工艺优化 生产实践 

分 类 号：TF71[冶金工程—钢铁冶金] TF777.2