Haynes Alloy 230
Haynes Alloy 230 (UNS N06230) is a nickel-chromium-tungsten-molybdenum alloy (57% Ni, 22% Cr, 14% W, 2% Mo) with outstanding high-temperature strength, oxidation resistance to 2100°F (1150°C), and long-term microstructural stability. Developed by Haynes International, it was specifically engineered for gas turbine combustion zone hardware and industrial furnace applications requiring sustained mechanical properties at temperatures that would cause stress rupture failure in conventional nickel superalloys used primarily at lower temperatures. It maintains useful strength at temperatures approaching 2000°F where most standard nickel alloys have lost structural integrity.
The tungsten addition provides solid-solution strengthening that is particularly effective at very high temperatures where other strengthening mechanisms have dissolved. Combined with its excellent oxidation and nitriding resistance, Alloy 230 has become a standard combustion hardware material in both aerospace gas turbines and industrial gas turbine systems.
Product Forms & Size Range of Haynes Alloy 230
Alloy 230 bar, forgings, and rings per AMS 5878 are available in round bar diameters from 0.375 inch to 8.000 inches and as forging stock. Bar and forging stock is supplied in the solution annealed condition for machining of combustion liner hardware, transition ducts, and structural brackets for gas turbine hot section assembly.
Alloy 230 bar, forgings, and rings per AMS 5878 are available in round bar diameters from 0.375 inch to 8.000 inches and as forging stock. Bar and forging stock is supplied in the solution annealed condition for machining of combustion liner hardware, transition ducts, and structural brackets for gas turbine hot section assembly.
HEAT TREATMENT OF HAYNES ALLOY 230
Alloy 230 is solution annealed at 2150–2275°F (1177–1246°C) followed by rapid quenching to produce a fully solutioned, carbide-free microstructure. No precipitation hardening treatment is applied for standard applications. Stress relief at 1800°F (982°C) is sometimes used for weldments. The alloy forms a stable M₆C carbide dispersion on aging at service temperatures, which contributes to its long-term creep strength stability — a designed-in property of the alloy that improves performance with time at temperature.
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Certified Material for Critical Service
Haynes Alloy 230 is supplied to AMS 5878 (bars, forgings, and rings) and AMS 5891 (sheet, strip, and plate). All forms are solution annealed. Certified mill test reports document composition, mechanical properties at room and elevated temperatures, and heat treatment condition. Elevated-temperature creep and stress rupture testing data are available from Haynes International for design applications.