Designated as UNS N07718 or W.Nr. 2.4668, Inconel 718, also known as “Alloy 718”, is a precipitation-hardenable nickel-chromium alloy containing significant amount of iron, niobium, and molybdenum along with lesser amounts of aluminum and titanium. The titanium and niobium are added to overcome strain-age cracking problems during welding and weld repair. Inconel Alloy 718 combines corrosion resistance and high strength with outstanding weldability, including resistance to postweld cracking. The alloy has excellent creep-rupture strength at temperatures up to 1300°F[700°C]. The Inconel 718 is fabricated for gas turbines, rocket motors, spacecraft, nuclear reactors, pumps and other piping tools. Most commonly, it is used for fasteners and springs.

1. Chemical Composition Requirements

Element	Content, %
Nickel (plus Cobalt)	50.00-55.00
Chromium	17.00-21.00
Iron	Balance
Niobium (plus Tantalum)	4.75-5.50
Molybdenum	2.80-3.30
Titanium	0.65-1.15
Aluminum	0.20-0.80
Cobalt	≤1.00
Carbon	≤0.08
Manganese	≤0.35
Silicon	≤0.35
Phosphorus	≤0.015
Sulfur	≤0.015
Boron	≤0.006
Copper	≤0.30

2. Physical Properties

Density, lb/in3		Melting Range		Specific Heat at 70°F, Btu/lb °F	Curie Temperature, °F(°C)		Permeability at 200 oersted and 70°F
Annealed	Annealed and Aged	°F	°C	at 21°C, J/kg °C)	Annealed Material	Annealed and Aged Material	Annealed Material	Annealed and Aged Material
0.296	0.297	2300-2437	1260-1336	0.104(435)	<-320(<-196)	-170(-112)	1.0013	1.0011

3. Product Forms and Related Standards of Inconel 718

Products form	Standard
Rod, bar and wire	ASTM B166
Plate, sheet and strip	ASTM B168, B906
Seamless pipe and tube	ASTM B167, B829
Billet and bar for reforging	ASTM B472
Forging	ASTM B564

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