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

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.

MP35N® is a multi-phase alloy containing Nickel, Cobalt, Chromium and Molybdenum with a unique range of properties - ultra high strength, toughness, bio-compatibility 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 hardness's of up to 55-60 Rockwell C and strength levels as high as 260-300 KSI.

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.

Anita Steel & Metals 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.

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

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