Haynes 718

Catalog : HAYNES 718

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Haynes 718

HAYNES® 718 alloy (UNS N07718) is an age-hardenable nickel-iron-chromium-niobium (columbium)-molybdenum-titanium-aluminum alloy designed to combine excellent strength with good fabrication characteristics in the annealed condition. While limited to applications below 1200°F (650°C), it is significantly stronger at these lower temperatures than materials such as Waspaloy alloy, R-41 alloy, or X-750 alloy. It is also much easier to weld than these alloys, and is less susceptible to the strain age cracking problems common for gamma prime strengthened materials. At temperatures greater than 1200°F (650°C), 718 alloy is being replaced by HAYNES® 282® alloy due to the superior strength of 282® alloy at those temperatures as well as its excellent fabricability.

%Chemical Composition

Mo Nb & Ta Cr Fe Co Ni
3 5 18 19 (max) 1 Balance
B C Al Ti Si Mn
0.004 0.05 0.5 0.9 (max) 0.35 (max) 0.35

Density & Melting Range

Melting Range (Celsius)  Density
1335 – 1260 (g/cm) 8.23

Mechanical Properties

% Elongation Yield Strength (MPa) Tensile Strength (MPa) Form
46.7 419 871 Sheet
49 395 857 Plate


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