Abstract:  Combined with the actual situation of X80 pipeline steel production in a factory, the dephosphorization process of combined blowing converter duplex process was tested, and the influence of basicity and oxidizability of converter slag on dephosphorization was studied. The results show that when the phosphorus content of hot metal is 0.118% and 0.116% , the alkalinity of the end slag CaO/SiO₂ of dephosphorization furnace and decarburization furnace is 1.6-2.0 and 3.3-4.1 respectively ,and the content of T. Fe is 10%-15% and 20%-35% respectively, the dephosphorization rate of the dephosphorization furnace is as high as 50.85% , the average is 38.35% , the end dephosphorization rate is the highest 95.69% , the average is 94.88% , and the phosphorus content of the molten steel at the end of smelting is controlled below 0.007% , the minimum is 0.005% , meeting the production requirements of X80 pipeline steel.

Key words: X80 Pipeline Steel, Combined Blowing Converter, Duplex Process, Dephosphorization

摘要： 结合某厂生产X80管线钢实际状况，对复吹转炉双联工艺的炼钢脱磷过程进行试验，研究转炉炉渣碱度和氧化性对脱磷的影响。结果表明:在铁水磷含量为0.118%和0.116%，脱磷炉和脱碳炉终点渣碱度CaO/SiO₂分别为1.6~2.0、3.3~4.1 ,T. Fe含量分别为10%~15% ,20%~35%的条件下,脱磷炉脱磷率最高达50.85%，平均为38.35%，终点脱磷率最高为95.69%，平均为94.88%，冶炼终点钢水磷含量控制在0.007%以下，最低0.005%, 满足X80管线钢生产要求。

关键词: X80管线钢, 复吹转炉, 双联工艺, 脱磷