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)
Alloy 718 Chemical Composition
Element Percent by Weight
C
Carbon 0.08 maximum
Mn
Manganese 0.35 maximum
P
Phosphorus 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
