UNS R30035/MP35N


MP35N is a nickel-cobalt base alloy of the Multiphase alloy system that has a unique combination of properties-ultra high strength, toughness, ductility and outstanding corrosion resistance. The alloy is work-strengthened and aged to obtain strength levels of 260 to 300 ksi(1793-2068 MPa). HY MP35N alloy resists corrosion in hydrogen sulfide, salt water and other chloride solution, as well as the mineral acids(nitric, hydrochloric, sulfuric).In addition, it has exceptional resistance to crevice and stress corrosion cracking in sea water and other hostile environments.




UNS R30035/MP35N

UNS R30035/MP35N

MP35N Material grades and equivalents:MP35N/UNS R30035/ W.Nr 2.4999/ AMS 5844/Allvac 35N

Chemical composition:

Weight% Ni Co Cr Mo Ti Fe Si Mn P B S C
MP35N 33 Balance 19 9 1 1 0.15 0.15 0.015 0.01 0.01 0.03
37 21 10.5 Max Max Max Max Max Max Max Max


Mechanical properties:

MP35N Alloy Ultimate Tensile
0.2% Offset Yield
Elongation in
Reduction of Area Hardness Shear
Typical Properties
of Solution Treated
130 ksi(896 MPa) 55 ksi(379 MPa) 65% 75% 90 HRB
Typical Properties
of AMS 5844 Product after 4 Hour Age at 1050℉(556℃)
290 ksi(2000 MPa) 280 ksi(1931 MPa) 10% 45% 51 HRC
AMS 5844 Specification Requirements after Aging 4 Hours at 1000-1200℉
260 ksi(1795 MPa),min. 230 ksi(1585 MPa),min. 8%,min. 35%,min. 150 ksi(1034 Mpa),min.

The above data are longitudinal properties.

  • Tensile properties will change depending on product size.
  • Not required by AMS 5844, but this is guaranteed shear strength.

MP35N application :

MP35N alloys can be applied to fasteners, springs, non-magnetic components and instrumentation in medical, seawater, oil and gas wells, chemical and food processing environments.