The invention relates to a
slag material for electroslag remelting of nuclear-grade stainless steel and a method for electroslag remelting by the
slag material. The
slag material is prepared from thefollowing components in percentage by weight: 40 to 70% of CaF2, 1 to 10% of MgF2, 10 to 20% of Al2O3, 10 to 20% of CaO, 1 to 10% of MgO, and 0 to 3% of BaO. The preparation method of an electroslag
ingot mainly comprises the following steps of preparation of an
electrode rod, preparation of the slag material, and electroslag remelting. The prepared electroslag
ingot has the advantages that the content of harmful elements of Co, B, Pb, Sn, H, P, S and the like is low, the surface quality is high, the components are uniform, the segregation is little, the microstructures are fine and dense, thesum of nonmetallic inclusions is lower than or equal to Grade 2.0, and the metallurgical quality requirement of the nuclear-grade stainless steel is met.