摘要
为实现高级别管线用超低P焊丝EF3的批量稳定生产,对脱P的热力学条件和动力学条件研究,明确脱P的条件。通过铁水脱P、100 t转炉脱P、钢包脱P配合扒渣、二次LF精炼防回P工艺,配合低P合金,实现了超低P焊丝EF3的稳定生产。控制铁水w[Si]≤0.15%,造高碱度(R=6)的炉渣,可同时脱P、脱S,实现铁水w[P]≤0.020%、铁水w[S]≤0.005%;转炉终点温度在1595~1610℃,终渣碱度4.0左右,终渣中w[FeO]在23.0%~26.0%,可实现转炉出钢w[P]≤0.008%;采用钢包脱P,可实现钢水w[P]≤0.004%;钢包脱磷后配合扒渣工艺,扒渣前后基本不回P,采用二次LF精炼防增P,配合低P合金,增P量极少;从而可实现中间包钢水w[P]≤0.005%。
In order to realize the stable batch production of ultra-low P welding wire EF3 for high-grade pipelines,the conditions of dephosphorization were determined by studying the thermodynamic and dynamic conditions of dephosphorization.Through the process of molten iron dephosphorization,100 t converter dephosphorization,ladle dephosphorization,slagging,secondary LF refining and anti-return P process,combined with low P alloy,stable production of ultra-low P welding wire EF3 is realized.By controlling molten iron w[Si]≤0.15%and making high basicity slag with R=6,it can remove P and S at the same time,achieve molten iron w[P]≤0.020%,iron w[S]≤0.005%;The end temperature of converter is from 1595℃to 1610℃,the basicity of the final slag is about 4.0,the content of FeO in the final slag is 23.0%-26.0%,the tapping w[P]of the converter is less than 0.008%;The molten steel w[P]is less than 0.004%by ladle dephosphorization;After dephosphorization with slag removal process,slag removal before and after the basic does not return P,Secondary LF is used to prevent P increase.P increase is very little with low P alloy.The slag removal process is adopted,the P content of molten steel w[P]≤0.005%in tundish can be achieved.
作者
张行利
亓奉友
苏永泽
崔贵博
唐庆
侯建伟
Zhang Xingli;Qi Fengyou;Su Yongze;Cui Guibo;Tang Qing;Hou Jianwei(Qingdao Branch,CITIC Pacific Steel Research Institute,Qingdao 266000,China)
出处
《特殊钢》
2024年第6期57-61,共5页
Special Steel
关键词
超低P焊丝EF3
转炉
脱P
扒渣
P含量
Ultra-low P Welding Wire EF3
Converter
Dephosphorization
Slag
P Content
