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Special Metals INCONEL® Alloy 718

Category Metal , Nonferrous Metal , Nickel Alloy , Superalloy
Manufacturer Special Metals (includes the former Inco Alloys International Inc.)
Trade Name INCONEL®
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Special Metals INCONEL® Alloy 718.pdf
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Material Notes:
Developed in the early 1960's, IN718 is still considered the material of choice for the majority of aircraft engine components with service temperatures below 1200°F (650°C). Inconel 718 is a precipitation-hardenable nickel-chromium alloy containing also significant amounts of iron, niobium, and molybdenum along with lesser amounts of aluminum and titanium. It combines corrosion resistance and high strength with outstanding weldability including resistance to postweld cracking. The alloy has excellent creep-rupture strength at temperatures to 1300°F (700°C).Applications: Aerospace, gas turbines, rocket motors, spacecraft, space shuttles, nuclear reactors, pumps, turbo pump seals, and tooling.Forms: round, flat, extruded section, pipe, tube, forging stock, plate, sheet, strip and wire.Data provided by the manufacturer, Special Metals.
Physical Properties Metric English Comments
Density 8.19 g/cc
0.296 lb/in³
Mechanical Properties Metric English Comments
Tensile Strength, Ultimate 1100 MPa

@Temperature 650 °C
 160000 psi

@Temperature 1200 °F
 Precipitation Hardened prior to test
1375 MPa

@Temperature 23.0 °C
 199400 psi

@Temperature 73.4 °F
Tensile Strength, Yield 1100 MPa

@Strain 0.200 %
 160000 psi

@Strain 0.200 %
 Precipitation Hardened. Value at room temperature
980 MPa

@Strain 0.200 %,
Temperature 650 °C
 142000 psi

@Strain 0.200 %,
Temperature 1200 °F
 Precipitation Hardened prior to test
Elongation at Break 25 %
25 %
Precipitation Hardened
18 %

@Temperature 650 °C
 18 %

@Temperature 1200 °F
 Precipitation Hardened prior to test.
Thermal Properties Metric English Comments
CTE, linear 13.0 µm/m-°C

@Temperature 20.0 - 100 °C
 7.22 µin/in-°F

@Temperature 68.0 - 212 °F
Specific Heat Capacity 0.435 J/g-°C
0.104 BTU/lb-°F
Thermal Conductivity 11.4 W/m-K
79.1 BTU-in/hr-ft²-°F
Melting Point 1260 - 1336 °C
2300 - 2437 °F
Solidus 1260 °C
2300 °F
Liquidus 1336 °C
2437 °F
Component Elements Properties Metric English Comments
Aluminum, Al 0.20 - 0.80 %
0.20 - 0.80 %
Boron, B <= 0.0060 %
<= 0.0060 %
Carbon, C <= 0.080 %
<= 0.080 %
Chromium, Cr 17 - 21 %
17 - 21 %
Cobalt, Co <= 1.0 %
<= 1.0 %
Copper, Cu <= 0.30 %
<= 0.30 %
Iron, Fe 17 %
17 %
As remainder
Manganese, Mn <= 0.35 %
<= 0.35 %
Molybdenum, Mo 2.8 - 3.3 %
2.8 - 3.3 %
Nickel, Ni 50 - 55 %
50 - 55 %
includes cobalt
Niobium, Nb (Columbium, Cb) 4.75 - 5.5 %
4.75 - 5.5 %
Phosphorous, P <= 0.015 %
<= 0.015 %
Silicon, Si <= 0.35 %
<= 0.35 %
Sulfur, S <= 0.015 %
<= 0.015 %
Titanium, Ti 0.65 - 1.15 %
0.65 - 1.15 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.000125 ohm-cm
0.000125 ohm-cm
Magnetic Permeability 1.0011
1.0011
at 200 oersted (15.9 kA/m)
Curie Temperature -112 °C
-170 °F
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