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Alloy K500 AG

Alloy K500 (Monel K500)


ALLOYK500 is a Ni-Cu alloy with age-hardening properties imparted by alloying additions of aluminium and titanium. Its basic composition is similar to that of ALLOY400 but the alloying additions make it age hardenable under

controlled conditions of temperature and time.

Characteristics of ALLOY K500

excellent corrosion resistance in an extensive range of natural and chemical environments
excellent resistance to chloride-ion stress-corrosion cracking
very high strength and hardness After age-hardening

After age-hardening of characeristics of ALLOY K500

approximately 2 to 3 times higher mechanical properties than the ALLOY400>
high tensile properties up to about 650 ‹C (1200 ‹F)
good fatigue and corrosion fatigue resistance
low permeability; non-magnetic down to -135 ‹C (-210 ‹F)

Corrosion resistance

In general, the corrosion resistance of Alloy K500 is similar to that of ALLOY400. Excellent resistance is shown to a wide range of media from pure water to mineral acids, salts and alkalis. Alloy K500 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. Alloy K500 also shows good resistance in sour-gas environments.


ALLOYK500 finds wide application in the marine, chemical, petrochemical and shipbuilding industries

Typical applications are:

valve seals, pump sleeves and wear rings in marine

environments - high strength and resistance to seawater

pump shafts for fire-fighting pumps - high strength (resulting

in smaller diameter shafts) and resistance to flowingseawater

fasteners, e.g. bolts, used in marine atmospheres and tidal

waters - resistance to chloride-containing environments

doctor blades and scrapers
towing cable armouring - high strength, non-magnetic

properties and resistance to seawater

springs - resistance to a variety of corrosive media
oil well drilling equipment such as non-magnetic drill

collars, valves and instrumentation sleeves - resistance to

chloride-containing media and sour-gas environments

aviation instrument components - non-magnetic properties