Preparation process of high-nitrogen high-manganese high-alloy austenitic stainless steel electrode bar for nuclear power

The invention discloses a preparation process of a high-nitrogen high-manganese high-alloy austenitic stainless steel electrode bar for nuclear power, which comprises the following steps: a, taking raw and auxiliary materials and alloy, and baking for later use; b, feeding the return scrap and the high-carbon ferrochrome baked in the step a into an electric arc furnace to be primarily smelted into mother liquor, so as to obtain a product B; c, the product B is mixed into an AOD converter to be smelted, then oxygen-argon-nitrogen proportional blowing is conducted, pre-deoxidation is conducted, full slag pulling is conducted after pre-deoxidation, nitrogen control operation is conducted, the product B is stirred with argon, the product B is tapped into a steel ladle, and a product C is obtained; d, argon is blown to the bottom of the steel ladle of the product D, and the product D is obtained; e, the product D enters a ladle refining furnace, slag surface deoxidation is conducted through aluminum powder, and a