Monel® K500 Round Bar

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Monel® K500 is a nickel-copper alloy with age hardening properties imparted by alloying additions of aluminum and titanium. Its basic composition is similar to Monel®400, but the alloying additions make it age hardenable, increasing its strength and hardness. This alloy can be delivered in the annealed, stress equalized, hot finished or age-hardened conditions. We stock nickel alloy K-500 in round bar, ready for processing and shipping.

Characteristics of Monel K-500

  • Resists sour-gas environments (where sulfide stress cracking may be a concern)
  • Strong corrosion resistance (ideal for valves, pump shafts, sensors)
  • Nearly nonmagnetic, even in low temperature environments
  • High strength and hardness due to the addition of aluminum and titanium
  • Excellent resistance to chloride-ion stress corrosion cracking
  • Can be cold worked before precipitation hardening to increase strength

K500 Inventory Size Ranges


0.875" - 1.750"

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Standard Inventory Specifications

  • QQ-N-286 - Form 1
  • UNS N05500

Common Trade Names

  • Monel® K500
  • Alloy K500
  • Monel® alloy K-500

Common Applications of K500

Monel® K-500 alloy finds wide applications in the marine, chemical, petrochemical and shipbuilding industries. Typical applications include:

  • 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 flowing seawater
  • Propeller shafts - high strength (resulting in smaller diameter shafts and thus smaller bearings) and resistance to seawater
  • Fasteners e.g. bolts, used in marine atmospheres and tidal waters - resistance to chloride - containing environments
  • Doctor blades and scrapers
  • Towing cable armoring - 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
Alloy K500 Chemical Composition
Element Percent by Weight
Ni Nickel 63% min
Mn Manganese 1.50% max
Si Silicon 0.50% max
Fe Iron 2.00% max
Al Aluminum 2.30% - 3.15%
S Sulfur 0.010% max
C Carbon 0.18% max
Cu Copper 27.0% - 33.0%

Physical Properties and Corrosion Resistance

In general the corrosion resistance of Monel® K-500 alloy 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. This alloy is virtually immune to Chloride-ion stress corrosion cracking. In the aged condition, the grade may be susceptible to stress-corrosion cracking in moist, aerated hydrofluoric
Acid vapor at stresses near the yield strength. In high velocity seawater and in marine atmospheres, good resistance is shown but, in slow moving or stagnant seawater, pitting may occur. Monel K500 also shows good resistance in sour-gas environments


Mechanical Properties

  • The following properties are applicable to Monel® K-500 alloy in the stated conditions and forms as well as the indicated size range (according to QQ-N-286). Specified properties of material outside these ranges are subject to special inquiry.

Tensile Data

Mechanical Property Requirements


Ultimate Tensile

Yield Strength (0.2% OS)



Rockwell C, min.

Hardness Brinell 3000 kg, min.

Cold Worked/SR Over 1(25.4) to 3


140 KSi

100 KSi







965 MPa

690 MPa




Hot Worked/ Aged Hardened


140 KSi

100 KSi







965 MPa

690 MPa




Properties may vary based on diameter.

After age-hardening Monel K500 alloy has:

  • Two to three times higher mechanical properties than Monel 400
  • High tensile properties up to about 650C (1200F)
  • Good fatigue and corrosion fatigue resistance
  • Low permeability; non-magnetic down to -135C (-210F)


Monel K500 is susceptible to work hardening during machining, and is best machined in the annealed condition.  High shear strength can make it difficult to remove material, and may generate significant heat during cutting.   It can be machined to a slightly larger size, age hardened, then finished to specifications.  Carbide tools are recommended for most applications, with appropriate oil soluble lubrication, as water based coolants may cause chipping.

Metallurgical Structure

  • Monel K500 alloy has a face-centered cubic structure.  In the age-hardened condition, a Ni3Al phase is formed with similar structure

Please contact us for more details.

The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.

* MONEL is a trademark of the Special Metals Corporation group of companies.