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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 |
| MP35N® 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 |
| MP35N® NACE MR0175 | Age @ 1300°F/ 4 hrs | 220 | 210 | 10 | 40 | 51 max |
| MP35N® NACE MR0175 | Age @ 1350°F / 4hrs | 210 | 200 | 10 | 40 | 51 max |
| MP35N® NACE MR0175 | 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) | ||||||
Availability
Alloy MP35N® is available in Round Bar, Tube, Wire, Sheet and Plate. For all stock availability contact Sales.
Specifications
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
NACE MR0175
ASTM F-562 - Surgical Implant Applications
BS 7252-6 Surgical Implant Applications
ISO 5832-6 Surgical Implant Applications
