Monel K500 (UNS n05500)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 Pipe. Alloy K-500 has approximately three times the yield strength and double the
tensile strength when compared with Monel k500 Sheet. 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.
This nickel alloy is spark resistant and non-magnetic to -200° F. However, it is possible to develop a magnetic layer on the surface of the material during processing. Aluminum and copper may be selectively oxidized during heating, leaving a magnetic nickel rich film on the outside. Pickling orbright dipping in acid can remove this magnetic film and restore the non-magnetic properties.
The corrosion resistance of Monel K-500(ASTM B865) 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 fasteners 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 .Monel K-500 Plate 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.
| Ni | Cu | Al | Ti | C | Mn | Fe | S | Si |
| 63.0-70.0 | Remainder | 2.30-3.15 | .35-.85 | .25 max | 1.5 max | 2.0 max | .01 max | .50 max |
Sour-gas service applications
Oil and gas production safety lifts and valves
Oil-well tools and instruments like drill collars
Oil well industry
Doctor blades and scrapers
Chains, cables, springs, valve trim, fasteners for marine service
Pump shafts and impellers in marine service
Monel K-500 is readily fabricated by standard commercial procedures.
Welding Monel K-500 Wire 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.
Typical Room Temperature Tensile Properties of Annealed Material
| 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 | Hot-Finished/Aged | 140-180 | 100-135 | 30-20 | 27-37 HRC |
| Sheet | Cold-Rolled/Annealed | 90-105 | 40-65 | 45-25 | 85 HRB Max |
Monel K500 Seamless Pipe
Monel K500 Welded Pipe
Monel K500 Seamless Tube
Monel K500 Welded Tube
Monel K500 Round Bars
Monel K500 Wire
Monel K500 Sheet
Monel K500 Plate
Monel K500 Forgings
Monel K500 Pipe Fittings
Monel K500 Flanges.
