The picture of inconel 718 Nickel sheet
Inconel 718 is a high strength nickel base superalloy used for cryogenic temperatures up to long term service at 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.
Chemistry
| Ni+Co | Cr | Cb+Ta | Mo | Ti | Al | Co | C | Mn |
MIN | 50.00 | 17.00 | 4.75 | 2.80 | 0.65 | 0.20 | -- | -- | -- |
MAX | 55.00 | 21.00 | 5.50 | 3.30 | 1.15 | 0.80 | 1.00 | 0.08 | 0.35 |
Si | P | S | B | Cu | Fe |
-- | -- | -- | -- | -- | -- |
0.35 | 0.015 | 0.015 | 0.006 | 0.30 | Balance |
Alloy Form
718 plate, round bar, sheet, welding products
Common Trade Names
Alloy 718, Inconel 718, Nickel 718
Features
- Good mechanical properties: tensile, fatigue and creep-rupture
- Excellent welding characteristics, resistant to postweld age cracking
- Oxidation resistant throughout its useful temperature range
Applications
- Gas turbine engine parts
- Liquid fuel rocket motor components
- Springs, fasteners
- Cryogenic tanks
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 |
Modulus of Elasticity, dynamic psi x 106 | - | 29 | 28 | 27 | 26 | 25 | 24 | 22 |
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