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、≤5Al_2O_3、≤5SiO_2、≥5CaF_2、≤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。
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. 50St, 1.25 - 1.40Mn,≤0. 025P, ≤〈0. 0255, O. 03-0. 06Nb） in casting by squareround bloom caster, the pipe line steel ）（52 is produced with using the technology including according to carbon content in liquid adding 200 - 500 kg/heat Fe-A1 deoxidizer at tapping of BOF, refining by high basicity slag （ % ： ≥70CaO, ≤5A1203 ,≤5SiO2 , ≥5CaF2 ,≤5MgO, ≤0. 05N） in LF process, and soft blowing argon for 5 rain 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 q5200 mm round bloom is nice and the rating of each item of macro-etch test is less than rating 1.0.
出处
《特殊钢》
北大核心
2011年第5期41-43,共3页
Special Steel
