本发明涉及一种用于冶炼GH984G镍基合金 的渣系及其使用方法，该渣系的成分按重量百分 比包括25～30％的CaO、20～25％的Al2O3、2～ 5％的MgO、4～7％的TiO2、1～3％的SiO2和其余 为CaF2。该渣系适用于T形结晶器抽锭电渣重熔 冶炼GH984G高温合金。通过本发明所提供的渣 系，能够很好的解决抽锭电渣重熔冶炼GH984G镍 基高温合金过程中所存在的铸锭头尾易氧化元 素分布不均匀和铸锭表面质量较差的问题。

The invention relates to a slag system and a method for smelting gh984g nickel base alloy and its application method. The composition of the slag system includes 25-30% Cao, 20-25% Al2O3, 2-5% MgO, 4-7% TiO2, 1-3% SiO2 and the rest CaF2. The slag is suitable for smelting GH984G superalloy by electroslag remelting of T-shaped crystallizer. The slag system provided by the invention can solve the problems of uneven distribution of oxidation elements and poor surface quality of ingot in the process of smelting GH984G Ni base superalloy by electroslag remelting.