January 5, 2016

Monel K500

Monel K500 ® UNS N05500

MONEL K500

MONEL K500

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.

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.


Corrosion Resistant Monel K-500

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.
Chemical Composition, %

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


Applications of Monel K-500 :

  • 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


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.

Mechanical Properties :
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

Available forms are :

  • 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.
Summary
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Inconel 718
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