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Special Metals INCONEL® Alloy 718
Categories: Metal; Nonferrous Metal; Nickel Alloy; Superalloy

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.

Key Words: IN718, INCONEL 718, AFNOR NC 19 Fe Nb, UNS N07718; ASTM B637, B670; ASME Boiler Code Sections I, III; AMS 5589, AMS 5590, AMS 5596, AMS 5597, AMS 5662, AMS 5663, AMS 5664, AMS 5832, Werkstoff Nr. 2.4668; WL Nr. 2.4668; MIL-N-24469; NACE MR-01-75; AECMA Pr EN 2404, 2405, 2407, 2408, 2952, 2961, 3219
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Physical PropertiesMetricEnglishComments
Density 8.19 g/cc0.296 lb/in³
 
Mechanical PropertiesMetricEnglishComments
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 0.2 %
160000 psi
@Strain 0.2 %
Precipitation Hardened. Value at room temperature
 980 MPa
@Strain 0.2 %,
Temperature 650 °C
142000 psi
@Strain 0.2 %,
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.
Rupture Strength  593 MPa
@Temperature 649 °C,
Time 3.60e+6 sec
86000 psi
@Temperature 1200 °F,
Time 1000 hour
 703 MPa
@Temperature 649 °C,
Time 360000 sec
102000 psi
@Temperature 1200 °F,
Time 100 hour
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.000125 ohm-cm0.000125 ohm-cm
Magnetic Permeability 1.00111.0011at 200 Oersted (15.9 kA/m)
Curie Temperature -112 °C-170 °F
 
Thermal PropertiesMetricEnglishComments
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-°C0.104 BTU/lb-°F
Thermal Conductivity 11.4 W/m-K79.1 BTU-in/hr-ft²-°F
Melting Point 1260 - 1336 °C2300 - 2437 °F
Solidus 1260 °C2300 °F
Liquidus 1336 °C2437 °F
 
Component Elements PropertiesMetricEnglishComments
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 %
Phosphorus, 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 %

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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