Abstract:  In consideration of easier nozzle clogging and difficult control of bloom quality for casting pipe line steel X52 ( % ： 0.14~0.18C, 0.30〜0.50Si, 1.25〜1.40Mn, ≤0.025P, ≤0.025S, 0.03~0.06Nb) in casting by square round bloom caster, the pipe line steel X52 is produced with using the technoiogy including according to carbon content in liquid adding 200 ~ 500 kg/heat Fe-Al deoxidizer at tapping of BOF, refining by high basicity slag (% :%:≥70CaO、≤5Al₂O₃、≤5SiO₂、≥5CaF₂、≤5MgO、≤0.05N) in LF process, and soft blowing argon for 5 min after refining. Results show that the average desulphurization rate is 37% , in steel the S ≤0.011 % and P ≤0.015% , the surface quality of Φ200 mm round bloom is nice and the rating of each item of macro-etch test is less than rating 1.0

Key words: Pipe Line Steel X52, BOF, LF Refining, Φ200 mm Round Bloom Casting

摘要： 由于方圆连铸机浇铸X52管线钢(%:0.14～0.18C、0.30～0.50Si、1.25～1.40Mn、≤0.025P、≤0.025S、0.03～0.06Nb)易发生水口堵塞和难控制铸坯质量,故采用转炉出钢时根据钢中的碳含量加入200～500kg/炉Fe-Al脱氧剂进行脱氧,在LF用高碱度渣(%:≥70CaO、≤5Al₂O₃、≤5SiO₂、≥5CaF₂、≤5MgO、≤0.05N)进行精炼,精炼结束软吹氩≥5 min等技术措施生产X52管线钢。结果表明,LF平均脱硫率37%,钢中S≤0.011%、P≤0.015%,Φ200 mm连铸圆坯表面质量良好,低倍各项评级均小于1.0级。

关键词: X52管线钢, 转炉, LF精炼, Φ200 mm圆坯连铸