Alloy MP159 (AMS 5841)

Technical Data Sheet

Chemical Composition Limits
Weight % Ni Co Cr Fe Mo Ti Cb Al
MP159 25.5 35.7 19.0 9.0 7.0 3.0 0.6 0.2

MP159 is a Nickel-Cobalt based multiphase alloy. This combination of properties enables ultra high strength, toughness, good ductility and excellent corrosion resistance. Through work strengthening and aging MP159 alloy exhibits ultimate tensile strength levels in excess of 1830 MPa. MP159 is used in many different industries from use in prosthetic devices, jet engine components, fasteners, marine applications to petroleum industry applications.

Typical Mechanical Properties

Material Condtion Tensile Strength ksi Yield Strength ksi Elongation % Reduction of Area % Hardness HRC
MP159 Annealed
123 58 60 69  
MP159 AMS 5841 160 max 70 max 50 65 20 HRC max
MP159 Annealed, Cold Worked 48% 230 205 12 46  
MP159 AMS 5842 - - - -


MP159 Annealed, Cold Worked + Aged 275 265 8 35  
MP159 AMS 5843 260 min 250 min 6 min 20 min ≥44HRC

Alloy MP159 is available in Bar (Round). For all stock availability contact Sales.

UNS R30159

AMS 5841 Bar (Solution Heat Treated)
Solution Heat Treat: 1900°F - 1925°F / 4-8 hours + Water Quench

AMS 5842 Bar (Solution Heat Treated and Work Strengthened)
Solution Heat Treat: 1900°F - 1925°F / 4-8 hours + Water Quench
Followed by work strengthened / strain hardening

AMS 5843 Bar (Solution Heat Treated, Work Strengthened and Aged)
Solution Heat Treat: 1900°F - 1925°F / 4-8 hours + Water Quench
Followed by work strengthened / strain hardening
Ffollowed by ageing: 1200-1250°F 4-4.5 hours + Air Cool.

At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (, the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

Our expertise in global logistics enables us to source material from anywhere in the world in a matter of days and provide fast shipping solutions to all our customers, whichever country they are in. We use a range of transport partners to ship overnight within the UK and Europe, and offer a full range of logistics solutions from priority express services to more cost-effective economy shipments all around the globe. To find out more about our services click here.

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.