防止含钛焊丝钢GF50-G水口结瘤的生产实践

特殊钢 ›› 2018, Vol. 39 ›› Issue (3): 9-12.

防止含钛焊丝钢GF50-G水口结瘤的生产实践

杨咏阶^1,2, 刘玉爱^1,2, 张向勇¹

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

收稿日期:2017-11-23 出版日期:2018-06-01 发布日期:2022-06-02
作者简介:杨咏阶(1977-)，男，硕士(2007年北京科技大学)，工程师, 2000年武汉科技大学(本科)毕业,炼钢工艺和品种开发。

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

Yang Yongjie^1,2 , Liu Yuai^1,2 , Zhang Xiangyong¹

1 Technology Center, Shandong Guangfu Group Co Ltd, Binzhou 256217 ；
2 Engineering Research Center of Large Size Alloy Structural Steel Bars of Shandong Province, Bingzhou 256217

Received:2017-11-23 Published:2018-06-01 Online:2022-06-02

摘要/Abstract

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TiO₂。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。

关键词: 含钛焊丝钢GF50-G, 水口结瘤, TiO_2, , 工艺优化, 生产实践

Abstract: 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 x 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 clogging 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 °C to 1 550 °C , controlling [ Alt] ≤ 0. 010% , [O] ≤ 15 x 10^-6 before adding ferrotitanium and decreasing reoxidation of liquid steel the nozzle clogging could be prevented, and the continuous casting heats may increase from 3 ~4 heats to 8 ~ 10 heats.

杨咏阶, 刘玉爱, 张向勇. 防止含钛焊丝钢GF50-G水口结瘤的生产实践[J]. 特殊钢, 2018, 39(3): 9-12.

Yang Yongjie, , Liu Yuai, Zhang Xiangyong. Production Practice of Preventing Nozzle Clogging for Casting Ti-Bearing Welding Wire Steel GF50-G[J]. Special Steel, 2018, 39(3): 9-12.