MP35N™ – AMS

• Applications

  The high strength variant of MP35N™ is used in a wide range of applications, in aerospace particularly for fasteners and airframe components.

  Elsewhere MP35N is used in motor sports, medical etc. for:

  • fasteners
  • springs
  • non-magnetic electrical components
  • instrument parts
  • valve components
  • high pressure door fittings
  • actuators
  • seals
  • shafts and other components

• Melting

  MP35N™ is produced by vacuum induction melting followed by VAC-ARC remelting to provide exceptional control of chemistry and ingot solidification.

  MP35N™ has a face centred cubic structure matrix of cobalt and nickel, in which chromium and molybdenum are soluble at elevated temperatures. The FCC structure persists upon cooling to room temperature and below.

  The combination of the amount of cold work and ageing temperature achieves the final properties desired. For AMS 5844/5 (fully strength/heavily cold worked) material, the alloy is typically aged at 566ºC for 4 hours.

  This material has generally excellent corrosion resistance properties, including stress corrosion cracking (SCC) resistance for harsh environments as well as resists attack from mineral acids (nitric, hydrochloric and sulphur). The material also has exceptional resistance to crevice and stress corrosion cracking in hostile environments.

  ASTM Grain size is 4 or finer.

  We can supply round bar from stock and material can also be supplied as cold drawn tubing on a lead-time.

• Heat Treatment & Weldability

  Solution Treatment
  Temperature: 1038-1052 ℃
  Time: 4-8 hours
  Cooling: Air

  Age AMS 5844 / AMS 5845
  Temperature: 538-649 ℃
  Time: 4 hours
  Cooling: Air

  Note: Exposure to temperatures above the recommended ageing levels may result in a significant (and non-reversible) loss of strength caused by the reversion of the cold worked metallurgical structure to a much softer annealed structure.

• Mechanical Properties (Specific for Bars)

  Acc to AMS 5844/5845	Yield strength Rp0.2, MPa	Tensile strength Rm, MPa	Elongation [%]	RA %	HRC [max]
  Full strength	1586	1793	8	35	44
  Reduced strength (1448 min yield)	1448	1517	10	45	N/A
  Reduced strength (1310 min yield)	1310	1379	10	45	N/A

   

  The above are only guaranteed up to 2” dia.

  Mechanical Tests are conducted at room temperature in accordance with ASTM E8; hardness in accordance with ASTM E18; Macroetch in accordance with ASTM A604; Grain Size in accordance with ASTM E112.

  Shear strength: bar sizes up to 1” (25.4 mm) diameter can be guaranteed to a minimum shear strength of 1034 MPa. Bar sizes of a diameter larger than 1” are considered capable of meeting the 1034 MPa minimum shear strength value, but this is not guaranteed.

• Chemical Composition

  Weight %	Ni	Co	Cr	C	Si	Mn	S	Mo	P	Fe	Ti	B
  Min.	33,0	Bal.	19,0					9,0
  Max.	37,0	Bal.	21,0	0,025	0,15	0,15	0,01	10,5	0,015	1,0	1,0	0,15

   

Stocked Products and Dimensions

• Bar

  From 12.7 mm (1/2”) to 76.2 mm (3”). The material can also be supplied as cold drawn tubing on a lead-time.

  Diameter tolerance +/- 0.003” (0.076mm). Density 8.43 h/cm3.

  We can supply round bar and material can also be supplied as cold drawn tubing on a lead-time.

  Available from UK stock.