Nickel Alloy 725 / Inconel 725®

Technical Data Sheet


Chemical Composition Limits
Weight% Ni Cr Mo Nb Ti Al C Mn Si P S Fe
Alloy 725 55.0-59.0 19.0 -22.5 7.0-9.5 2.75-4.0 1.0-1.7 0.35 max 0.03 max 0.35 max 0.20 max 0.015 max 0.010 max Rem

Alloy 725 (UNS N07725) is a nickel-chromium-molybdenum-niobium alloy that is highly resistant to corrosion and has been age hardened for extremely high strength twice that of annealed alloy 625. Alloy 725 strength is developed by heat treatment rather than by cold work this also enables strength to be imparted to large non-uniform sections that cannot be strengthened by cold works. Alloy 725 is used for hangers, landing nipples and high strength fasteners in marine applications.

Typical Mechanical Properties


Material Form and Condition Yield Strength (0.2% Offset) Tensile Strength Elongation % Hardness, Rc
ksi MPa ksi MPa
Alloy 725 round Annealed
62.0 427 124.0 855 57 5
Alloy 725 round Age Hardened 133.0 917 180.0 1241 30 36
Transverse Specimens from hot-finished rounds of 4.0 to 7.5 in (102 to 190mm) diameter

Alloy 725 is available in Bar, Round Bar, Flat Bar, Forging Stock. Contact Sales for further availability.

Bar and Wire ASTM B 805, ASME Code Case 2217
Bar and Forging Stock SMC Specification HA91, ASME Code Case 2217
UNS N07725
FMC Spec M40504
NACE MR-0175/ ISO 15156
Inconel 725 (trademark)

At Aircraft Materials all stock items can be shipped out within 24 hours, usually within the same day. Even cutting orders for bar or sheet can be processed and dispatched the same day, and for time-critical situations such as AOGs, we have a dedicated AOG service desk ready to help (

Thanks to our global logistics network we can source from anywhere in the world in just a few days. We use a range of transport partners to enable us to ship overnight within the U.K. and Europe and provide fast shipping solutions to the rest of the world. If your requirement is urgent we can offer a priority shipping service, but also if time is not so critical we can offer more cost-effective options to ensure you get the best value for money. 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.

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