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Cobalt MP35N

Cobalt MP35N

MP35N* alloy is a nonmagnetic, nickel-cobalt-chromium-molybdenum alloy having ultra-high tensile strength (up to 300 ksi), good ductility and toughness, and excellent corrosion resistance. In addition, this alloy displays exceptional resistance to sulfidation in salt water environments, high temperature oxidation, and hydrogen embrittlement.

The unique properties of MP35N* alloy are developed through work hardening, and aging. If the alloy is used in the fully work hardened condition, service temperatures up to 750°F. It has been used in fasteners, springs, nonmagnetic electrical components and instrument parts in medical, seawater, oil and gas well, and chemical and food processing environments. Parts in medical, seawater, oil and gas well, and chemical and food processing environments. Sizes available in 2 ¾” diameter and under.

Physical Properties

Element min max
Carbon 0.025
Manganese 0.15
Silicon 0.15
Phosphorus 0.015
Sulfur 0.010
Chromium 19.00 21.00
Nickel 33.00 37.00
Molybdenum 9.00 10.50
Titanium 1.00
Iron 1.00
Cobalt remainder

Tensile Properties As Solution Heat Treated

Property Value
Tensile Strength 115 to 145 ksi
Yield Strength at 0.2% Offset 35.0 to 65 ksi
Elongation in 4D, min 50%
Reduction of Area, min 65%

Select AMS Number:

AMS Number Alloy Type UNS Cross Ref. Spec Misc./Shape
AMS 5844 MP35N Cobalt R30035 - Bar
AMS 5758 MP35N Cobalt R30035 - Bar
AMS 5845 MP35N Cobalt R30035 - Bar


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