Alloy 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.
Chemical Composition, %
Ni+Co
Cr
Cb+Ta
Mo
Ti
Al
Co
C
Mn
Si
P
S
B
Cu
Fe
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
0.35
0.015
0.015
0.006
0.30
Balance
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
Common Trade Names
Alloy 718, Inconel® 718, Nickel 718
INCONEL® and INCOLOY® are registered trademarks of Special Metals (PCC)
SPEC SHEET
Alloy 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.