Alloy K-500（UNS NO5500） |
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Summary | A precipitation-hardenable nickel-copper alloy that combines the corrosion resistance of alloy 400 with greater strength and hardness. It also has low permeability and is nonmagnetic to temperatures as lowas -101°. Used for pump shafts, oil-well tools and instruments, doctor blads and scrapers, springs, value rim, fasteners, and marine propeller shafts. |
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Standard Product Forms | Pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. |
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Chemical Composition Wt,% |
| Min | Max. |
| Min. | Max. |
| Min. | Max. |
Ni | 63.0 |
| Cu | 27.0 | 33.0 | C |
| 0.18 |
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Cr |
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| Co |
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| Si |
| 0.5 |
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Fe |
| 2.0 | Al | 2.3 | 3.15 | P |
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Mo |
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| Ti | 0.35 | 0.85 | S |
| 0.01 |
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W |
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| Mn |
| 1.5 | N |
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Physical Constants | Density,g/ 8.44 |
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Melting Range,℃ 1315-1350 |
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Typical Mechanical Properties | (Precipitation Hardened) Tensile Strength, ksi 160 Mpa 1100 Yield Strength (0.2% Offset),ksi 115 Mpa 790 Elongation, % 20 
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Microstructure
alloy 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 age-hardened condition a submicroscopic gamma prime Ni3Al phase is formed throughout the matrix.
Characters
Alloy k500 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, Alloy K500 has approximately 2 to 3times 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 Resistance
In general, the corrosion resistance of Alloy K500 is similar to that of Alloy 400. 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-ionstress-corrosion cracking. In the aged condition, the alloy may be susceptible to stress-corrosion cracking in most, 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 environment.
Applications
Alloy K500 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. Doctor blads and scrapers;
3. Fasteners, e.g. Bolts, used in marine atmospheres and tidal waters - resistance to chloride-containing environments;
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 nedia and sour-gas environments'
6. Springs - resistance to a variety of corrosive media;
7. Aviation instrument components - non-magnetic.
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