MONEL® alloy K-500


FeaturesMonel K-500 (UNS N05500)MONEL K-500 alloy has the same corrosion resistance as 400, but has higher mechanical strength and hardness. It has good corrosion resistance and long-term structure stability. It is mainly used to manufacture turbine blades and gas turbine blades whose working temperature is below 750℃ on aeroengines; Used for manufacturing fasteners and springs on ships; Pump and valve parts for chemical equipment; Pulp blades on paper making equipment, etc.
SummaryA precipitation-hardenable nickel-copper alloy that combines the corrosion resistance of MONEL alloy 400 with greater strength and hardness. It also has low permeability and is nonmagnetic to temperatures as low as -150°F (-101°C). Used for pump shafts, oil-well tools and instruments, doctor blades and scrapers,springs, valve trim, fasteners, and marine propeller shafts.
StandardPipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire.
Product Forms
Chemical composition (wt.-%) according to ASTMMin.Max.Min.Max.Min.Max.
ConstantsMelting Range,℃1315-1350
Typical(Precipitation Hardened)
MechanicalTensile Strength, ksi160
Yield Strength (0.2% Offset), ksi115
Elongation, %20
MicrostructureMonel K-500 which is produced by adding aluminum and titanium to the basic Monel nickel-copper composition also has a face-centered cubic structure. In the agehardened condition a submicroscopic gamma prime Ni3Al phase is
CharactersMonel K-500 has excellent corrosion resistance in an extensive range of natural and chemical environments, excellent resistance to chloride-ion stress-corrosion cracking and very high strength and hardness. After age-hardening, Monel K-500 has approximately 2 to 3 times higher mechanical properties than the nickel-copper alloy (Monel 400), high tensile properties up to about 650 ℃, good corrosion fatigue resistance and ow permeability with non-magnetic down to -135 ℃.
Corrosion ResistanceIn general, the corrosion resistance of Monel K500 is similar to that of Monel 400. Excellent resistance is shown to a wide range of media from pure water to mineral acids, salts and alkalis.
Monel K-500 is virtually immune to chloride-ion stress-corrosion cracking. In the aged condition, the alloy may be susceptible to stress-corrosion cracking in moist, aerated hydrofluoric acid vapour at stresses near the yield strength.
In high-velocity seawater and in marine atmospheres, good corrosion resistance is shown but, in slow-moving or stagnant seawater, pitting may occur. Nicorros Al also shows good resistance in sour-gas environments.
Monel K-500 finds wide application in the marine, chemical, petrochemical and shipbuilding industries.
Typical applications include:
1. Valve seals, pump sleeves and wear rings in marine
environments – high strength and resistance to seawater;
2. Fasteners, e.g. bolts, used in marine atmospheres and tidal waters – resistance to chloride-containing environments;
3. Doctor blades and scrapers;
4. Towing cable armouring – high strength, non-magnetic properties and resistance to seawater;
5. Oil well drilling equipment such as non-magnetic drill collars, valves and instrumentation sleeves – resistance to chloride-containing media and sour-gas environments;
6.Springs – resistance to a variety of corrosive media;
7.Aviation instrument components – non-magnetic properties.