instrument and implant grade metal alloys

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Cobalt Alloy MP35N® (2.4782) Medical Alloy

Alloy MP35N® is a Vacuum Induction Melt / Vacuum Arc Remelt (VIM/VAR) cobalt alloy which obtains very high strength, corrosion resistance and fatigue resistance due to its two-stage cold working and aging treatment process. Machining is relatively difficult and not advised in the annealed condition so material is supplied in the solution treated and cold worked condition to allow for the final ageing stage. After aging, hardness levels can reach over 55 HRC and strengths levels as high as 260-300ksi.


Orthopedic implants
Joint replacement
Medical, surgical, dental instruments
Watch components
Aerospace industry

Typical Chemical Composition

C Si Mn P S Cr Mo Ni Fe Co
Min 19.00 9.00 33.00
Max 0.02 0.15 0.15 0.015 0.010 21.00 10.50 37.00 1 Balance

Typical Mechanical Properties

Condition Tensile (Rm)
Yield (R0.2%)
A4d (%)
Reduction of
Area %
Solution Heat Treated / Cold Worked 255 225 12 50 45
Solution Heat Treated / Cold Worked / Aged 260 230 8 35 38 min


ISO 5832-6
AMS 5758
AMS 5844
AMS 5845
UNS R30035


Alloy MP35N® is available in wire and round bar from 0.600mm diameter up to 35.00mm diameter

Disclaimer : Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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Metal Weight Calculator

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NOTE: Weights calculated are theoretical. Manufacturing tolerances should be allowed for and results adjusted accordingly.