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Inconel Alloy
Inconel 718
- Product Details
Inconel 718
Inconel Alloy 718 is a high-strength, nickel-based superalloy made for long-term use in temperatures ranging from cryogenic up to 1200°F. The alloy is readily fabricated and may be welded in either the annealed or precipitation (age) hardened condition.
Anneal 1700 -1850°F; air cool or faster. Age 1325°F 8 hours; furnace cool to hold at 1150°F for a total aging time of 18 hours, air cool. Alloy 718 will show a contraction of 0.0008 inch/inch after precipitation hardening.
Inconel 718 Chemistry
|
Alloy
|
%
|
Ni+Co
|
Cr
|
Cb+Ta
|
Mo
|
Ti
|
Co
|
C
|
Mn
|
Al
|
Si
|
P
|
S
|
B
|
Cu
|
Fe
|
|
718
|
Min.
|
50.00
|
17.00
|
4.75
|
2.80
|
0.65
|
—
|
—
|
—
|
0.20
|
—
|
—
|
—
|
—
|
—
|
—
|
|
Max.
|
55.00
|
21.00
|
5.50
|
3.30
|
1.15
|
1.00
|
0.08
|
0.35
|
0.80
|
0.35
|
0.015
|
0.015
|
0.006
|
0.30
|
Balance
|
Inconel 718 Specifications
AMS 5596, AMS 5662, AMS 5663, AMS 5832
ASME Case 2222-1, ASME SFA 5.14
ASTM B 637, ASTM B 670
EN 2.4668
GE B50TF14, GE B50TF15
UNS N07718
Werkstoff 2.4668
Inconel 718 Avaliable Shape
Inconel 718 Plate, Inconel 718 Round Bar,Inconel 718 Sheet,Inconel 718 Welding Products
Common Trade Names
Alloy 718, Inconel® 718, Nickel 718
Inconel 718 Features
- Good mechanical properties: tensile, fatigue and creep-rupture
- Good mechanicalExcellent welding characteristics, resistant to postweld age cracking
- Good mechanicalOxidation resistant throughout its useful temperature range
Inconel 718 Applications
- Gas turbine engine parts
- Liquid fuel rocket motor components
- Springs, fasteners
- Cryogenic tanks
Inconel 718 Physical Properties
Density: 0.296 lb/in3 annealed, 0.274 lb/in3 aged
Melting Point: 2410 – 2540°F
| Temperature, °F | -320 | 70 | 200 | 400 | 600 | 1000 | 1200 | 1400 |
| Coefficient* of Thermal Expansion, in/in°F x 10-6 | 5.9 | – | 7.3 | 7.5 | 7.7 | 8.1 | 8.4 | 8.9 |
| Thermal Conductivity | – | 6.4 | 7.2 | 8.2 | 9.3 | 11.3 | 12.3 | 13.3 |
| Btu • ft/ft2 • hr • °F | ||||||||
| Modulus of Elasticity, Dynamic psi x 106 | – | 29 | 28 | 27 | 26 | 25 | 24 | 22 |
* 70°F to indicated temperature.
Mechanical Properties
Typical Room Temperature Properties, 1800°F Annealed Condition
| Ultimate tensile strength, ksi | 135 |
| 0.2% yield strength, ksi | 70 |
| Elongation, % | 45 |
| Hardness, Rockwell B | 100 |
Average Tensile Properties, ½” Bar Annealed 1800°F, Aged 1325/1150°F
| Temperature, °F | 70 | 400 | 800 | 1000 | 1200 | 1400 |
| Ultimate Tensile Strength, ksi | 210 | 198 | 191 | 185 | 168 | 111 |
| 0.2% Yield Strength, ksi | 175 | 163 | 156 | 155 | 149 | 110 |
| Elongation, % | 22 | 20 | 19 | 18 | 19 | 27 |
| Hardness, Rockwell C | 42 – 44 | – | – | 40 – 41 | 40 – 41 | 33 – 34 |
Typical Stress Rupture, Bar, Annealed 1800°F, Aged 1325/1150°F
| Temperature, °F | 1100 | 1200 | 1300 | 1400 |
| 100 Hours, ksi | 170 | 110 | 75 | 44 |
| 1,000 Hours, ksi | 130 | 85 | 55 | 25 |
