Valve steel NCF3015 Φ280 mm x 1700 mm electrode (/% ： 0. 03 ~0. 08C

13.5 〜15. 5Cr

30 ~ 33.5Ni

1.7-2. 1A1

2.4 ~2.9Ti

0.65 ~0. 80Mo

0.65 ~0.80Nb

0.002 - 0.006B) is remelted into Φ340 mm 0. 80 t electroslag ingot with full coaxial inert gas shielding. Under the conditions of full argon protection with ternary premelted slag 70CaF

2

-15Al

2

O

3

-15CaO and a melting rate 4 kg/min

the amount of burning loss of Al and Ti and the change of Si and S removal rate in the process of gas valve steel NCF3015 electroslag remelting are tested

and the mechanism is explained. The results show that Al is the main burning element relative to Ti

the average burning loss of Al is -0. 071%

and

the average burning loss of Ti is -0.035% ; and the burning loss of Al and Ti gradually decreases from the bottom to the top of electroslag remelted ingot. Compared with the burning loss rate of conventional electroslag remelting

argon protection has a significant effect on reducing the burning loss of Al and Ti

The burning loss of Al and Ti causes a slight increase in Si content at the initial stage of remelting. The slag system has a certain desulfurization effect

with an average desulfurization rate of 36.7 % .