LF+VD工艺生产X70管线钢洁净度研究  

Study on improving cleanliness of molten steel in X70 pipeline steel produced by LF+VD process

作　　者：李阳 胡显堂 石树东 闫占辉 杨赵军 谢翠红 LI Yang;HU Xiantang;SHI Shudong;YAN Zhanhui;YANG Zhaojun;XIE Cuihong(Steel Rolling Department of Shougang Jingtang Iron and Steel United Co.,Ltd.,Tangshan 063200,China)

机构地区：[1]首钢京唐钢铁联合有限责任公司钢轧作业部,河北唐山063200

出　　处：《炼钢》2024年第2期57-64,79,共9页Steelmaking

摘　　要：为了对“LF+VD”工艺生产X70管线钢过程中夹杂物的演变机理进行研究,进行了密集取样和分析,并对VD炉深真空工艺和钙处理工艺实施了优化。研究结果表明VD炉深真空过程采用前期强氩气搅拌保持13 min,后期弱氩气搅拌保持5 min可以促使大颗粒夹杂物充分上浮,同时VD炉破空后钙处理控制钙质量分数为0.0010%~0.0014%,可促使夹杂物充分变性达到低熔点区的目的,使得钢板夹杂物一检小于等于2.0级别合格率比例由96.3%提高至98.7%以上,钢水洁净度得到提高。In order to study the evolution mechanism of inclusions in the production of X70 pipeline steel by"LF+VD"process,intensive sampling and analysis were carried out,and the VD furnace deep vacuum process and calcium treatment process were optimized.The results show that in the deep vacuum process of VD furnace,strong argon stirring for 13 min in the early stage and weak argon stirring for 5 min in the later stage can promote the full floating of large particle inclusions.At the same time,the calcium treatment after the VD furnace broken can control the calcium mass fraction at 0.0010%-0.0014%,which can promote the full denaturation of inclusions to reach the purpose of low melting point area,so that the qualified rate of inclusions less than or equal to 2.0 in the first inspection of steel plate can be increased from 96.3%to more than 98.7%,and the cleanliness of molten steel is improved.

关 键 词：管线钢 洁净度 VD炉 夹杂物 

分 类 号：TF769[冶金工程—钢铁冶金]