ALLOYK500 (Monel K500)

Corrosion Resistance
Chemical Composition
Mechanical properties
International Standard Comparision Chart Stock Form And Sizes
Round Bars
Hex Bars
Nuts And Washers
Spring Washer
Hex Bolt
Stud Bolt
Sourceable Materials


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)

Stock Form and Sizes

※ ◆1000㎜ ◎2000㎜ ▲3000㎜ ■3500㎜ ●4000㎜ ★2500㎜~3990㎜

Round BarsSpecification:ASTM B865 QQ-N-286 NACE MR0175(ISO 15156)
Stock Specification: Hot Rolled + Aged
size 1〜13
1.2 1.6 2 2.6 3 3.5 4 4.4 5 5.3 6 7.1 8 8.95 10 12 13
size 16〜50
16 18 19 20 22 24 25 28 30 32 35 36 38 40 42 45 50
size 55〜135
55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135
size 140〜300
140 145 150 155 160 165 170 180 190 200 210 220 230 250 280 300  

Sourceable Ex-Stock Material for other Forms from Distributors World-Wide

Equivalent Round Bars Plate Pipe/Tube Welding Rod & Wire
Min Max Min Max
MonelK500 12.7~304.8 1〜50.8    

*○: Various sizes available in stock. △: Only limited sizes available in stock. ☆: Please contact us for more details.
* We can supply materials and products that comply with various standards including ASTM, ASME, AMS, and NACE standards. Please contact us for more details.

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 flowing seawater
  • ・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

Chemical composition

  Ni Fe C Mn Si Cu Al Ti S P Zn Pb Sn
min 63.0 0.5       27.0 2.30 0.35          
max   2.0 0.20 1.5 0.50 33.0 3.15 0.85 0.010 0.020 0.020 0.006 0.006

※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

Mechanical properties(Round Bar)

  Condition Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HB)
ASTM Min Value Soft Annealed・Aged 690 965 20 265
Typical Values at RT Hot worked・Aged 902 1078 25 305
Typical Values at RT Cold worked・Aged 902 1078 22 310
Typical Values at RT Soft Annealed・Aged 686 1000 28 285

Please contact us with any questions about reference or value of plate and pipe.
※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

International Standard Comparison Chart

  Material Round Bars Plates/Sheets
JIS NW5500 H4553 H4551
DIN 2.4375 17752  
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