General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Monel K500 is a precipitation-hardenable nickel-copper alloy that combines the excellent corrosion resistance characteristic of Monel 400 with the added advantage of greater strength and hardness. These amplified properties, strength and hardness, are obtained by adding aluminum and titanium to the nickel-copper base and by a thermal processing used to effect precipitation, typically called age hardening or aging. When in the age-hardened condition, Monel K-500 has a greater tendency toward stress-corrosion cracking in some environments than Monel 400. Alloy K-500 has approximately three times the yield strength and double the tensile strength when compared with alloy 400. Plus, it can be further strengthened by cold working prior to precipitation hardening. The strength of this nickel steel alloy is maintained to 1200° F but stays ductile and tough down to temperatures of 400° F. Its melting range is 2400-2460° F.
The characteristics of Monel K500
- Corrosion resistance in an extensive range of marine and chemical environments. From pure water to non-oxidizing mineral acids, salts and alkalis.
- Excellent resistance to high velocity sea water
- Resistant to a sour-gas environment
- Excellent mechanical properties from sub-zero temperatures up to about 480C
- Non-magnetic alloy
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
Chemical Composition
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
Physical Properties and Corrosion Resistance
- The corrosion resistance of alloy K-500 is substantially equivalent to that of alloy 400 except that when in the age-hardened condition, nickel alloy K-500 has a greater tendency toward stress-corrosion cracking in some environments. Monel K-500 has been found to be resistant to a sour-gas environment. The combination of very low corrosion rates in high-velocity sear water and high strength make alloy K-500 particularly suitable for shafts of centrifugal pumps in marine service. In stagnant or slow-moving sea water, fouling may occur followed by pitting but this pitting slows down after a fairly rapid initial attack
Mechanical Properties
Mechanical Properties K500
Product Form | Condition | Tensile (ksi) | .2% Yield (ksi) | Elongation % | Hardness | |
Rod & Bar | Hot-Finished /Aged | 140-190 | 100-150 | 30-20 | 27-38 HRC | |
Rod & Bar | Hot Finished /Annealed | 90-110 | 40-60 | 45-25 | 75-90 HRB | |
Rod & Bar | Hot Finished /Annealed /Aged | 130-165 | 85-120 | 35-20 | 24-35 HRC | |
Rod & Bar | Cold-Drawn /Aged | 135-185 | 95-160 | 30-15 | 25-41 HRC | |
Rod & Bar | Cold-Drawn /Annealed /Aged | 130-190 | 85-120 | 30-20 | 24-35 HRC | |
Plate | ot-Finished /Aged | 140-180 | 100-135 | 30-20 | 27-37 HRC | |
Sheet | Cold-Rolled /Annealed | 90-105 | 40-65 | 45-25 | 85 HRB Max |
Fabrication with Monel K-500
- Monel K-500 is readily fabricated by standard commercial procedures.
- Welding alloy K-500 is best accomplished by the gas-tungsten-arc welding process. It is recommended that Monel K-500 be annealed when it is welded and that any weldments be stress relieved prior to aging.
- Heavy machining of this alloy is best accomplished when the material is in the annealed condition or hot-worked and quenched condition. Age-hardened material however can be finish-machined to close tolerances and fine finishes. Therefore, the recommended practice is to machine slightly oversize, age-harden, then finish to size. During aging, a slight permanent contraction takes place, but little warpage occurs because of the low temperatures and slow cooling rates involved.

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