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/SiO

2

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.