General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Inconel® 718 is a precipitation-hardening nickel-chromium alloy containing
significant amounts of iron, columbium, and molybdenum, along with lesser amounts of aluminum and titanium. 718
materials maintain high strength and good ductility up to 1300°F (704°C). This alloy has relatively good
weldability, formability, and excellent cryogenic properties compared to other precipitation hardening nickel
alloys. The sluggish precipitation hardening response of this alloy allows it to be readily welded without hardening
or cracking. Alloy 718 is non-magnetic. It maintains good corrosion resistance and oxidation resistance and is used
for parts requiring high resistance to creep and stress rupture up to 1300°F (704°C) and oxidation resistance up to 1800°F (982°C).
Standard Inventory Specifications
- 718 Sheet, Coil and Plate:
- UNS N07718
- AMS 5596
- ASTM B 670
- ASME SB 670
- B50TF14
- 718 Round Bar:
- UNS N07718
- AMS 5662
- ASTM B 637
- B50TF15
- B50809D (Power Generation)
Other industry standards we comply with:
- PWA-LCS
- DFARS Compliant
- RR SABRe Edition 2
- S1000 / S-SPEC-1
- GE Aviation S-SPEC-35 AeDMS S-400
- EN 2.4668
- EN 10204
Common Trade Names
- Haynes 718 (® Haynes International)
- ATI 718 (™ Allegheny Technologies)
- Inconel Alloy 718 (® Special Metals)
Common Applications of 718
- Jet engine
- Gas turbine operations
- Base plates
- Rotor bolts (Power Generation)
Chemical Composition
Chemical Composition of Inconel 718
Element
Percent by Weight
C
Carbon
0.08 maximum
Mn
Manganese
0.35 maximum
P
Phosphorous
0.015 maximum
S
Sulfur
0.015 maximum
Si
Silicon
0.35 maximum
Cr
Chromium
17.00 – 21.00
Ni
Nickel
50.00 – 55.00
Mo
Molybdenum
2.80 – 3.30
Nb
Columbium
4.75 – 5.50
Ti
Titanium
0.65 – 1.15
Al
Aluminum
0.20 – 0.80
Co
Cobalt
1.00 maximum
B
Boron
0.006 maximum
Cu
Copper
0.30 maximum
Ta
Tantalum
0.05 maximum
Fe
Iron
Balance
Physical Properties
Alloy 718 Physical Properties
Density and Specific Gravity
Annealed Condition | Aged Condition | |
Density | 0.296 lb./in3 (8.19 g/cm3) | 0.297 lb./in3 (8.22 g/cm3) |
Specific Gravity | 8.19 | 8.22 |
Thermal Conductivity
Temperature Range | Coefficients | ||
°C | °F | W/m·K | Btu/(hr/ ft²/in/°F) |
0-100 | 32-212 | 6.5 | 11.2 |
Electrical Resistivity at 68°F (20°C)
- Annealed: 127 microhm-cm
- Aged: 121 microhm-cm
Mechanical Properties
Mechanical Properties and Yield Strength of Alloy 718
Product | Yield Strength Max (0.2% Offset) | Ultimate Tensile Strength Max | Elongation (% in 2″) |
Sheet and Strip | 80,000 psi (550 MPa) | 14,000 (965 MPa) | 30 (min) |
Plate | 105,000 psi (725 MPa) | 150,000 (1,035 MPa) | 30 (min) |
Typical Short Time Tensile Properties as a Function of Temperature
- Solution Treatment: 1800°F (982°C) 1 hour
- Precipitation Treatment: 1325°F (718°C) 8 hours, Furnace Cool at 100°F (55°C) per hour to 1150°F (621°C) 8 hours Inconel 718 machining often results in less tool life due to the work hardening and abrasion properties of the alloy. High cutting pressure and temperature also contributes towards work hardening, surface tearing, and deformation.

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