METHOD FOR SMELTING HIGH-CHROMIUM NICKEL ALLOY OF EP648-VI GRADE Russian patent published in 2021 - IPC C22C1/02 C22B9/16 C22C19/05 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to methods for smelting nickel alloys with high chromium content (up to 40%), intended for the manufacture of highly loaded parts with a limited service life at temperatures up to + 950°C. The method for smelting a high-chromium nickel alloy of EP648-VI grade includes preparation of charge materials, formation of a filling, smelting of a grade alloy in a vacuum induction furnace. When preparing charge materials, preliminary smelting is carried out in a vacuum induction furnace and casting into ingots of high-chromium alloy with chromium content of 40-55% using up to 100% of waste, including up to 50% of chips of the brand of alloy being melted, metal chromium and tungsten-chromium alloys and molybdenum-chromium, the surface of the melted high-chromium master alloy ingots is machined, which in an amount of up to 65% is set for smelting a grade alloy in a vacuum induction furnace as a part of charge materials together with metallic tungsten, molybdenum, niobium and nickel.

EFFECT: requirements for the chemical composition of the alloy being melted and the level of properties are met, and the cost of production is reduced by saving expensive and scarce charge materials.

4 cl, 1dwg, 3 tbl, 1 ex