This paper introduces the practice of producing low carbon steel QD08 by using RH-LF refining method at Wuhu Xinxing Pipe Co Ltd. We analyzed and studied the initial conditions of converter outbound molten steel

RH vacuum decarburization principle and process control

LF smelting from three aspects. The results show that the initial molten steel control conditions are [C

]

0.04% ~0.010%

[0

]

>300 x 10

-6

and the converter end temperature TN 1 650 X.. With the increase of the vacuum treatment time

the vacuum degree decreased

the PCO in the vacuum chamber decreased

the concentration of carbon and oxygen decreased

and the decarburization was carried out in the vacuum chamber. The vacuum decarburization was determined by RH vacuum decarburization. The decarburization rate changed increase first and then decrease

the decarburization rate has

some regularity. After the RH vacuum treatment

the molten steel needs to be operated in the LF

such as desulfurization

heating and alloying

and the amount of slag is 20 ~ 23 kg/t

final slag (FeO) + (MnO)

<

1.2%

 R≥3.5 .