Inconel 718

Inconel718 high-temperature alloy
Features and applications overview:
This alloy has good comprehensive performance at the temperature range of 253 to 700°C. Its yield strength below 650°C is the largest among high-temperature alloys. Apart from good processing properties and weldability, it has good performance in anti-fatigue, anti-oxidation, anti radiation and corrosion resistance. This alloy can be used to made a variety of complex-shaped parts. It has been used widely in the aerospace, nuclear energy, oil industry and the extrusion die.
Inconel718's similar grades:
GH4169 GH169(China)、NC19FeNb(France)、W.Nr.2.4668 NiCr19Fe19Nb5(Germany)
Chemical composition, %:
Nickel........................................50-55
Chromium..................................17-21
Iron.............................................balance
Molybdenum..............................2.8-3.3
Niobium......................................4.75-5.5
Cobalt.........................................1.0 max
Carbon........................................0.08 max
Manganese..................................0.35 max
Silicon.........................................0.35 max
Sulfur...........................................0.015 max
Copper..........................................0.3 max
Aluminium...................................0.2-0.8
Titanium.......................................0.65-1.15
Physical properties：
Density, g/cm3 .......................8.24
Melting Range, °C.................1260-1320
Thermal conductivity,
λ/(W/m•°C), at 100°C ...........14.7
Specific heat, J/kg•°C..............435
Elastic modulus, GPa...............199.9
Shear modulus, GPa.................77.2
Electrical resistivity, μΩ•m.........1.15
Poisson's ratio............................0.3
Coefficient of linear expansion,
a/10-6°C-1, at 20-100°C.............11.8

Mechanical properties：(the minimum value detected at room temperature)
Tensile strength, σb/MPa...............965
Yield strength,σp0.2/MPa..........550
Elongation,σ5 /%.................................30
Brinell Hardness, HBS..........................≥363
The way of heat treatment is solution treatment
Available products and specifications:
Bar: ASTM B637, AMS 5662, AMS 5663, AMS 5664, ASME SB637
Forging: ASTM B637, AMS 5662, AMS 5663, AMS 5664, ASME SB637
Plate/Strip: ASTM B670, ASTM B906, AMS 5596, AMS 5597
Wire: AMS 5832
Pipe: AMS 5589, AMS5590
The metallurgical structure of Inconel718:
The structure of the alloy in the state of standard heat-treatment consists of γ matrixγ'、γ