MP159 (UNS R30159) - Super Alloy - Fry Steel

Super Alloy / MP-159

MP159 a high strength, corrosion- and heat-resistant cobalt-nickel-chromium alloy that is produced by multiple melting using vacuum induction followed by vacuum consumable electrode melting practice and then solution heat treated and cold drawn. This alloy is typically used for applications requiring a combination of high strength up to 1100 F (593 C), good tension-tension fatigue strength, toughness, and ductility. This material exhibits exceptionally good resistance to corrosion, crevice-corrosion, stress-corrosion cracking, and elevated temperature relaxation. MP159 is often used for prosthetic devices, jet engine components, fasteners, marine applications to petroleum industry applications. (UNS R30159)

Chemical Makeup of MP159 Alloy

Element Min Max
Carbon, C -- 0.04
Manganese, Mg -- 0.2
Silicon, Si -- 0.2
Phosphorus, P -- 0.02
Sulfur, S -- 0.01
Chromium, Cr 18 20
Cobalt, Co 34 38
Molybdenum, Mo 6 8
Columbium (Niobium), Nb 0.25 0.75
Titanium, Ti 2.5 3.25
Aluminum, Al 0.1 0.3
Iron, Fe 8 10
Boron, B -- 0.03

Common Applications of MP159 Alloy

  • Aerospace Aerospace
  • Medical Medical
  • Industrial Industrial


  • Ultra High Strength
  • Corrosion Resistance
  • Heat Resistance
  • Good Toughness
  • Good Ductility

We stock MP-159 to the following specifications:

  • AMS-5842
  • AMS-5843 CAP. OF
  • UNS-R-10359

Click on a cross-section to see the sizes we stock:

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