提高26 t中间包覆盖剂碱度改善管坯质量的生产实践

特殊钢 ›› 2017, Vol. 38 ›› Issue (1): 42-45.

提高26 t中间包覆盖剂碱度改善管坯质量的生产实践

李国丰, 王学义, 张兵, 孙健

天津天管特殊钢有限公司，天津300301

收稿日期:2016-09-05 出版日期:2017-02-01 发布日期:2022-07-28
作者简介:李国丰(1984-)，男，硕士(2009年北京科技大学)，工程师，2006年西安建筑科技大学(本科)毕业，炼钢工艺研究。

Production Practice for Improvement of Quality of Tube Bloom by Increasing Basicity of 26 t Tundish Covering Powder

Li Guofeng, Wang Xueyi, Zhang Bing ,Sun Jian

Special Steel Co Ltd, Tianjin Steel Pipe Group, Tianjin 300301

Received:2016-09-05 Published:2017-02-01 Online:2022-07-28

摘要/Abstract

摘要： 生产试验钢种26CrMo4,30Mn5和30Mn6V的冶金流程为150 t EAF-LF-VD-Φ210~310 mm管坯连铸。从6炉钢使用原低碱度中间包覆盖剂和15炉高碱度覆盖剂（/%:9.2MgO,0.87Fe₂O₃,44.03CaO,7.53SiO₂,18.68Al₂O₃）冶炼的钢中夹杂物的分析结果表明,使用现有低碱度中间包覆盖剂钢中Al含量从VD弱搅结束后到中间包衰减5×10^-6~35×10^-6,平均Al含量减少25×10^-6,而使用碱度为6中间包覆盖剂衰减10×10^-6~20×10^-6,使用原覆盖剂VD到中间包300mm²钢样上110μm夹杂物明显增多,>10μm夹杂物减少,而使用碱度为6覆盖剂VD到中间包相同面积钢样上110μm夹杂物减少,>10μm夹杂物明显减少,表明碱度为6的中间包覆盖剂比原覆盖剂更适合纯净钢生产。

Abstract: The metallurgy flowsheet of tested production steel grades 26CrMo4, 30Mn5 and 30Mn6V is 150 t EAF- LF-VD-0210 〜310 mm tube bloom casting. The results of analysis on inclusions in steels steelmaking by 6 heats using original low basicity tundish covering powder and by 15 heats using high basicity tundish covering powder (/% : 9. 2MgO, 0. 87Fe₂O₃,44.03CaO, 7. 53SiO₂, 18. 68Al₂O₃) show that with using original low basicity tundish covering powder, the Al content in liquid from end VD soft stirring to tundish decreases by 5 x 10^-6~ 35x10^-6，average Al content decreases by 25 x 10^-6 , but that with using basicity 6 tundish covering powder decreases by 10 x 10^-6 ~ 20 x 10^-6 ； with using original covering powder the amount of 1 ~ 10μm inclusions in steel sample at 300 mm² area increases obviously from VD to tundish and that of > 10 μm inclusions decreases, but with using basicity 6 tundish covering powder the amount of 1 ~ 10 μm inclusions in steel sample at same area decreases from VD to tundish and that of > 10μm inclusions decreases obviously ,it indicates that as compared with original covering powder the basicity 6 tundish covering powder is more suitable for steelmaking of clean steel.

李国丰, 王学义, 张兵, 孙健. 提高26 t中间包覆盖剂碱度改善管坯质量的生产实践[J]. 特殊钢, 2017, 38(1): 42-45.

Li Guofeng, Wang Xueyi, Zhang Bing , Sun Jian. Production Practice for Improvement of Quality of Tube Bloom by Increasing Basicity of 26 t Tundish Covering Powder[J]. Special Steel, 2017, 38(1): 42-45.