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Inconel 718

Designated as UNS N07718 or W.Nr. 2.4668, Inconel 718, also known as “Alloy 718”, is a precipitation-hardenable nickel-chromium alloy containing significant amount of iron, niobium, and molybdenum along with lesser amounts of aluminum and titanium. The titanium and niobium are added to overcome strain-age cracking problems during welding and weld repair. Inconel Alloy 718 combines corrosion resistance and high strength with outstanding weldability, including resistance to postweld cracking. The alloy has excellent creep-rupture strength at temperatures up to 1300°F[700°C]. The Inconel 718 is fabricated for gas turbines, rocket motors, spacecraft, nuclear reactors, pumps and other piping tools. Most commonly, it is used for fasteners and springs.

Inconel 718 fasteners: bolts & nuts

Inconel 718 fasteners: hexagonal bolts with nuts.

1. Chemical Composition Requirements

ElementContent, %
Nickel (plus Cobalt)50.00-55.00
Chromium17.00-21.00
IronBalance
Niobium (plus Tantalum)4.75-5.50
Molybdenum2.80-3.30
Titanium0.65-1.15
Aluminum0.20-0.80
Cobalt≤1.00
Carbon≤0.08
Manganese≤0.35
Silicon≤0.35
Phosphorus≤0.015
Sulfur≤0.015
Boron≤0.006
Copper≤0.30

2. Physical Properties

Inconel 718 Springs

Inconel 718 springs used in a trunnion mounted ball valve.

Density, lb/in3Melting RangeSpecific Heat at 70°F, Btu/lb °FCurie Temperature, °F(°C)Permeability at 200 oersted and 70°F
AnnealedAnnealed and Aged°F°Cat 21°C, J/kg °C)Annealed MaterialAnnealed and Aged MaterialAnnealed MaterialAnnealed and Aged Material
0.2960.2972300-24371260-13360.104(435)<-320(<-196)-170(-112)1.00131.0011

3. Product Forms and Related Standards of Inconel 718

Products formStandard
Rod, bar and wireASTM B166
Plate, sheet and stripASTM B168, B906
Seamless pipe and tubeASTM B167, B829
Billet and bar for reforgingASTM B472
ForgingASTM B564

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    Hebei Metals Industrial Limited
    (Shijiazhuang Metalsin Pipeline Tech Co., Ltd)
    No. 176, Zhonghua South Street, Shijiazhuang, China.
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