Alloy MP35N® (AMS 5844/AMS 5845/ NACE MR0175)

Technical Data Sheet

MP35N® is a multi-phase alloy containing Nickel, Cobalt, Chromium and Molybdenum with a unique range of properties - ultra high strength, toughness, biocompatibility and corrosion resistance. It is produced by vacuum induction melting and vacuum arc re-melting (VIM-VAR) and is then strengthened by work hardening and aging, giving hardnesses of up to 55-60 Rockwell C and strength levels as high as 260-300KSI.

Due, to this unique combination of properties, MP35N® has many applications in such industries as oil and gas, aerospace and medical. MP35N can be effectively used at cryogenic temperatures without embrittlement and maintain its properties at temperatures up to 600°F, and is also suitable for medical implants and orthodontic/prosthetic devices.

MP35N® is able to resist corrosion to most mineral acid, hydrogen sulfide and seawater environments whilst exhibiting excellent resistance to stress corrosion cracking and hydrogen embrittlement, even at high strength levels. NACE MR0175 allows a hardness of up to 51 HRC for material that has been work strengthened and aged by one of the processes listed in the table below.

Aircraft Materials supplies MP35N® in round bar certified to either AMS 5844 (0.270" - 1.520" diameter) or NACE MR0175 (0.5" - 2.5" diameter), as well as sheet, strip and plate products suitable for medical applications.

Chemical Composition Limits
Weight % Ni Co Cr Mo Ti Fe Si Mn P B S C
MP35N® 33-37 Bal 19-21 9-10.5 1 max 1 max 0.15 max 0.15 max 0.015 max 0.010 max 0.010 max 0.03 max
MP35N® is a registered trademark of SPS Technologies Inc.

Typical Mechanical Properties

Material Condtion Ultimate Tensile Strength ksi 0.2 % Yield Strength ksi Elongation % Reduction of Area % Hardness HRC
MP35N ®
AMS 5844
Solution Heat Treated and Work Strengthened 255 225 12 50 45
AMS 5845
Solution Heat Treated and Work Strengthened and Aged 260 230 8 35 38 min

AMS 5844 is Solution Treated and Cold Worked. The AMS specification only requires that the hardness shall not be lower than 38 HRC or equivalent. However other typical mechanical properties of AMS 5844 are detailed above.

Material Condtion Tensile Strength ksi Yield Strength ksi Elongation % Reduction of Area % Hardness HRC
Age @ 1300°F/ 4 hrs 220 210 10 40 51 max
Age @ 1350°F / 4hrs 210 200 10 40 51 max
Age @ 1425°F / 6hrs 190 180 10 40 51 max
MP35N® Properties as per NACE MR0175 - Cold Drawn - Reduced Strength (min properties, round bar under 2" dia)

Alloy MP35N® is available in Round Bar, Tube, Wire, Sheet and Plate. For all stock availability contact Sales.

UNS R30035

AMS 5758 - MP35N® VIM-VAR Bar
Solution heat treated @1900-1925°F for 4 to 8 hours

AMS 5844 - MP35N® VIM-VAR Bar
Solution heat treated @1900-1925°F for 4 to 8 hours and Work Strengthened

AMS 5845 - MP35N® VIM-VAR Bar
Solution heat treated @ 1900-1925°F for 4 to 8 hours, Work Strengthened & Aged @ 1000-1200°F for 4 hours

ASTM F-562 - Surgical Implant Applications
BS 7252-6 Surgical Implant Applications
ISO 5832-6 Surgical Implant Applications

For more information about MP35N for use in medical applications, visit our medical division at

MP35N® is a registered trademark of Standard Pressed Steel (SPS) Technologies Inc.

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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.