Alloy 718 API

    Alloy 718 API

    Alloy 718 (UNS N07718) is a high-strength, corrosion-resistant nickel chromium material that offers high strength and excellent corrosion resistance, particularly in H2S and CO2 environments.  718 can be used in high temperatures as it has high temp de-rating factors and maintains strength at elevated temperatures.  Several conditions of 718 API are available at vSM. We offer the NACE/API 6ACRA versions at 120 ksi min yield as well as the 150 ksi high strength version.  Both tempers are suitable for sour service and can be used for pressure containing and pressure controlling equipment in corrosive environments. Typical applications include packers, safety valves, pumps, hangers, connectors, and fasteners.

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    Alloy 718 Specification/Condition

    • API 6ACRA / NACE MR0175

    Alloy 718 Applications

    • Packers
    • Hangers
    • Polish bore receptacles (PBRs)
    • Valves, gates, and seats
    • Fasteners
    • Connectors & couplings
    • Safety vales
    • Pressure containing equipment
    • Multiple downhole drilling & completions, nuclear and surface applications

    Alloy 718 Technical Data

    • UTS (KSI): 150 Min
    • Yield 0.2% Offset (KSI): 120 – 145 Min
    • EL (% Min): 20
    • RA (% Min): 35
    • Hardness (HRC): 32-40
    • Charpy Impact Min. ft-lbs: 35 @-75°F

    Stocking Dimensions

    • Bar: 0.5 – 14.0 dia
    • Bored Bar with bespoke internal diameters via vSM’s in-house deep hole drilling and honing capabilities


    Alloy 718 Chemical Composition (Wt %)


    0.045 Max 0.35 Max 0.010 Max 0.010 Max 0.35 Max 50.0-55.0 1.00 Max


    Niobium + Tantalum
    (Nb (Cb) + Ta)
    Iron (Fe) & Others
    17.0-21.0 2.8-3.30 4.87 -5.20 Max 0.80-1.15 0.23 Max 0.40-0.60 Fe– Balance, B-0.0060, Pb– 0.0010 Max


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