METHOD FOR PRODUCTION OF CORROSION-RESISTANT NICKEL-BASED HN63MB ALLOY WITH CARBON CONTENT BELOW 0.005% Russian patent published in 2021 - IPC C22C1/03 C22B9/04 C22C19/05 

FIELD: metallurgy.

SUBSTANCE: invention relates to the area of metallurgy, specifically to methods for production of a corrosion-resistant nickel-based HN63MB alloy with a carbon content lower than 0.005%, and can be used in manufacture of welded chemical equipment operating in corrosive environments. The method for production of a corrosion-resistant nickel-based HN63MB alloy with a carbon content lower than 0.005% includes melting charge materials in vacuum, refining the resulting melt in vacuum at a temperature of 1550÷1750°C and smelting a grade alloy. Pure charge materials and up to 80% of nickel-molybdenum master alloy are used as charge materials, wherein nickel-molybdenum master alloy ingots are first smelted in air in an open furnace at atmospheric pressure with blowing the master alloy melt with oxygen to reach a minimum carbon content not exceeding 0.001÷0.002%, the resulting master alloy in form of ingots is then added to the pure charge materials and vacuum-induction melting of the brand alloy is executed.

EFFECT: method provides low carbon content in the alloy and allows to conserve expensive and deficient metal molybdenum.

4 cl, 1 dwg, 2 tbl, 1 ex