About Alloy
MP35N (AMS 5844/AMS 5845/ NACE MR0175) 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.
Product Form
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
Chemical Composition
| 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 |
Property
| Material | Condition | 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 |
| Material | Condition | 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 |
Application
MP35N is extremely suitable in environments where a high combination of strength, high modulus values, and good corrosion resistance are required. Some examples of these types of applications, include:
Medical devices
Dental products
Marine engineering
MP35N can be used to manufacture fasteners, springs, non-magnetic components and instrumentation in medical, seawater, oil and gas wells, chemical and food processing environments.
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