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MP35N Superalloy

MP35N (AMS 5844) is a ‘superalloy’ – a vacuum induction, vacuum arc re-melted quaternary alloy which can withstand high temperatures, high stresses and hostile atmospheres.

The alloy is unusual because it offers such an attractive and unique combination of characteristics which will enhance performance - the alloy benefits from excellent tensile strength, ductility and toughness. Supplied in the annealed condition, MP35N can achieve tensile strength levels over 260 Ksi (1793 MPa) while retaining flexibility. Furthermore, additional tensile strength is achievable by work hardening and ageing.

Corrosion Resistance

Another feature of this superalloy is the materials excellent resistance to the effects of corrosion. Typically used in the cold-worked condition, MP35N is resistant to hydrogen sulphide corrosion, saltwater corrosion and also offers resistance to other chloride solutions and certain mineral acids. It is, therefore, a highly suitable alloy for above and subsea applications. Resistance to crevice cracking in saltwater environments is also excellent.

It can also be effectively used in cryogenic temperatures without evidence of embrittlement and conversely the alloy will also retain its properties in elevated temperature service up to a threshold of 600°F.

Working, Machining & Joining

MP35N alloy can be hot and cold worked and formed by a wide variety of processes. Work strengthening can be accomplished by extruding, rolling, swaging, drawing or a combination.

Typical Applications

General applications for the use of this alloy include:

  • Aerospace fasteners
  • Springs
  • Downhole pump shafts and tools
  • Pins, tension bolts, shear bolts and tie rods
  • Non-magnetic electrical components
  • Medical applications

Applications in Motorsport

At Smiths High Performance, our experience has allowed us to identify the unique performance qualities that MP35N nickel alloy can provide to race car designers and manufacturing sub-contractors. We look to give our customers options, which will allow them to gain a competitive advantage, which is why MP35N has become a popular and established product within our high-performance engineering materials portfolio.

MP35N has proved popular in the production of motorsport fasteners. At first glance, the significance of using a superalloy for fastenings is not abundantly clear. For example, superalloys are more expensive to produce when compared to other alloys, which can offer similar strength. However, it is an impressive combination of performance characteristics, which is critical here. MP35N gives designers and manufacturers the ability to design fasteners, which are smaller and yet can still operate reliably under exceptional stresses while also maintaining resistance to corrosion.

A good example would be the use of MP35N in the production of fasteners to secure main bearing caps. The alloy offers excellent strength and excellent fatigue resistance, but most critically it will allow the engine to function reliably. Adopting a cheaper alloy as an alternative would reduce costs, but for similar results, the fastener would need to be larger, heavier and it is unlikely to be able to offer the same all-around capabilities of MP35N. Nor would a more substantial component be a welcome addition when weight reduction, reliability and performance are of paramount importance.

Connecting rod bolts (known in the industry as con rods) are manufactured using MP35N. These bolts come under enormous stresses, and any failure could prove to be catastrophic, which is why the use of this alloy in such applications is critical. We recognise that improved reliability, safety and performance are essential requirements of the motorsport sector, which is why MP35N is one of our most sort after products.

About Smiths HP

We are a leading stockholder and supplier of high-performance engineering materials to the motorsport sector. We are supply partners in a range of specialist motorsport markets including Formula 1, Formula E, NASCAR, MOTO GP, WEC & WRC.