Alloy K-500

UNS N05500 : BS 3076 NA18 : ASTM B865 (VO2.04)
Trade Name Monel K-500 (1)

General scope

Alloy UNS N05500 is a precipitation hardening version of Alloy 400 combining good corrosion resistance with high strength, increased hardness, low magnetic permeability and excellent cryogenic properties. Used widely in marine environments, as Pump Shafts, Fasteners, Propeller Shafts, Rotor Blades, Valve Trim, etc.

The alloy can also be supplied in the solution annealed and age hardened condition.

Until 2003, this alloy was approved for "general use". However, it is now restricted to special components and restricted well environments.

Chemical composition

C Si Mn P S Cr Ni Mo Cu Ti Al Fe
Min 63.00 27.00 0.35 2.30 0.00
Max 0.18 0.50 1.50 0.010 33.00 0.85 3.15 2.00

Mechanical properties

Condition: Hot Finished and Age Hardened

NACE MR0175 limits the supply hardness to 35 HRC max.
U.T.S 135 KSI Min (931 N/mm2)
0.2% Proof Stress 95 KSI Min (655 N/mm2)
Elongation 20 %
Red of Area 35 %
Size range: 1”∅ - 12”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore