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Inconel 718 is a nickel-chromium and age-hardenable alloy that brings in high strength against creep rupture when exposed to high temperatures close to 700oC or 1300oF. This alloy can also be fabricated into various complex components.
Its welding features, especially the resistance to cracking post welding, are deemed outstanding by the manufacturing community. When combined with fatigue, tensile, as well as rupture strength, this alloy has a wide-scale application. These alloy sheets are used for rings, fueled rockets, casings, as well as aircraft parts.
Common Names:
Executive Standards:
Plate, Sheet, and Coil
Round Bar:
Chemical Properties:
Chromium (%) | 17.00 to 21.00 |
Nickel + Cobalt (%) | 50.00 to 55.00 |
Columbium + Tantalum (%) | 4.75 to 5.50 |
Molybdenum (%) | 2.80 to 3.30 |
Aluminum (%) | 0.20 to 0.80 |
Titanium (%) | 0.65 to 1.15 |
Cobalt (%) | 1.00 Maximum |
Manganese (%) | 0.35 Maximum |
Carbon (%) | 0.80 Maximum |
Silicon (%) | 0.35 Maximum |
Sulfur (%) | 0.015 Maximum |
Phosphorus (%) | 0.015 Maximum |
Copper (%) | 0.30 Maximum |
Boron (%) | 0.006 Maximum |
Iron (%) | Balance |
Mechanical Properties:
Yield Strength | Ksi | 60 Minimum |
Mpa | 414 Minimum | |
Tensile Strength | Ksi | 120 Minimum |
Mpa | 827 Minimum | |
Elongation | % | 30 |
Physical Properties:
Density | Lbs/in3 | 0.296 |
g/cm3 | 8.19 | |
Specific Heat | Btu/lb °F | 0.104 |
J/kg °C | 435 | |
Thermal Expansion (Mean Coefficient) | in/in/° | 7.6 X 10 |
mm/m/°C | 13.0 | |
Elasticity Modulus | Ksi | 29.7 X 103 |
Mpa | 204.9 X 103 | |
Magnetic Permeability | Oersteds | 200 |
Annealed | – | 1.013 |
Annealed + Aged | – | 1.011 |
Melting Range | oF | 2300 to 2437 |
oC | 1260 to 1336 |






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