MP35N® (AMS 5844)

MP35N provides an attractive combination of ultra-high strength, toughness & corrosion resistance.

MP35N is a vacuum induction and arc-remelted quaternary alloy based on nickel and cobalt with substantial additions of chromium and molybdenum.

Overview:

The alloy possesses an attractive combination of ultra-high strength, toughness and outstanding corrosion resistance. MP35N alloy may be employed in the annealed condition but can easily be work strengthened to tensile strength levels over 260 ksi (1,793 MPa) with the retention of good ductility. Ageing of worked material causes precipitation hardening and can raise the tensile strength by 40 ksi (276 MPa). The density of MP35N alloy is 8.43 g/cc.

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. Smiths High Performance offers MP35N from stock in round bars ready for immediate supply. In-house processing options are also available.

Corrosion Resistance:

MP35N alloy offers outstanding resistance to general, crevice, and stress corrosion at all strength levels. The four alloying elements in MP35N form the basis for corrosion resistance in almost every stainless steel, nickel and cobalt-based alloys currently on the market. The alloy resists corrosion in hydrogen sulphide salt, salt water, other chloride solutions, and mineral acids (nitric, hydrochloric, sulphuric). The alloy is also resistant to hydrogen embrittlement.

Use in Fasteners:

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. 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 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 sought-after products.