Inconel 718


Inconel 718

INCONEL 718 is a heat and corrosion resistant nickel alloy. Parts built from INCONEL 718 have chemical composition corresponding to UNS N07718, AMS 5662, AMS 5664, W.Nr 2.4668, DIN NiCr19Fe19NbMo3. This kind of precipitation-hardening nickel-chromium alloy is characterized by having good tensile, fatigue, creep and rupture strength at temperatures up to 980 °C (1290 °F). This material is ideal for many high temperature applications such as gas turbine parts, instrumentation parts, power and process industry parts etc. It also has excellent potential for cryogenic applications. Parts built from INCONEL 718 can be easily post-hardened by precipitation-hardening heat treatments. In both as-built and age-hardened states the parts can be machined, sparkeroded, welded, micro shot-peened, polished and coated if required.

Mechanical Properties Test Method As Built Heat Treated
Tensile strength ISO 6892-1:2009(B) Annex D 980 ± 50 MPa Min. 1250 MPa
Yield Strength (Rp 0.2%) ISO 6892-1:2009(B) Annex D 700 ± 50 MPa Min. 1050 MPa
Elongation at Break ISO 6892-1:2009(B) Annex D 28 ± 3% Min. 10%
Young’s modulus - 160 ± 20 GPa 170 ± 20 GPa
Hardness DIN EN ISO 6508-1 Approx. 30 HRC Approx. 45 HRC
Thermal Properties Test Method  
Max. Operating Temp. ASTM E1461-13 Approx. 650° C
Oxidation Resistance to ASTM E1461-13 Approx. 980° C
Chemical Composition and Physical Properties    
Chemical composition Ni
Cr
Nb
Mo
Ti
Al
Co
Cu
C
Si/Mn
P/S
50 - 55%
17 - 21%
4,75 - 5,50%
2,80 - 3,30%
0,65 - 1,15%
0,20 - 0,80%
≤ 1%
≤ 0,3%
≤ 0,08%
≤ 0,35%
≤ 0,015%
Physical Properties Relative density Approx. 99,99 %
  Density 8,15 g/cm3
Heat Treatment Temperature Time (h)
Solution Annealing RT - 980°C -
  980°C 1
  980°C - RT -
Precipitation Hardening RT - 720°C -
  720°C 8
  720° C - 620°C 2
  620°C 8
  620°C - RT -