Alloy 718

A precipitation-hardenable nickel-chromium grade, Alloy 718, often referred to as Inconel 718, is a high strength superalloy used at temperatures up to 648°C.

With the addition of significant amounts of niobium and molybdenum along with aluminium and titanium, Alloy 718 has extremely high strength, excellent creep-stress rupture strength and good corrosion resistance.

Inventory

Product form	Size range from	Size range to
Alloy 718 round bar	4 mm	254 mm
Alloy 718 sheet & plate	0.25 mm	76.2 mm
Alloy 718 welding wire	0.5 mm	2.36 mm

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Welding Consumables
Sheet & Plate
Round Bar

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Chemical Analysis

%	Ni+Co	Cr	Mo	Cu	Co	C	Mn	Si	P	S	Fe	Ti	Al	Nb+Ta
Min	50	17	2.8	0	0	0	0	0	0	0	Balance	0.65	0.2	4.75
Max	55	21	3.3	0.3	1	0.08	0.35	0.35	0.015	0.015	Balance	1.15	0.8	5.5

Applications

Perfect for applications in the Aerospace industry

Alloy 718 can be used in a variety of applications including:

Gas turbine engine parts
Liquid fuel rocket motor components
Springs, fasteners
Cryogenic tanks
Pumps and valves
Tooling

About Alloy 718

Alloy 718, often referred to as Inconel 718, is precipitation hardened to give maximum strength and high creep-stress rupture strength. The alloy can be supplied in the annealed condition to enhance machinability followed by subsequent appropriate heat treatments. Capability tests are completed on test samples which have had the precipitation hardening process completed.

Alloy 718/Inconel 718, demonstrates outstanding weldability including resistance to post-weld cracking.

The major applications are components for gas turbines, aircraft engines, fasteners and other high strength applications. Its available in round bar, wire and sheet and plate.

For more information on Nickel Alloy 718, or to get a quote contact us or fill in our online quote form.

Properties

Density:: 8.193 g/cm³
Melting range:: 1321-1393°C

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Mechanical & Physical Properties	-196°C	21°C	93°C	204°C	316°C	538°C	649°C	760°C
Coefficient of Thermal Expansion µm/m⁰C	10.62	-	13.1	13.5	13.9	14.6	15.1	16
Thermal Conductivity /kcal/(hr.m.°C)	-	9.5	10.7	12.2	13.8	16.8	18.3	19.8
Modulus of Elasticity / x10⁵ MPa	-	2	1.93	1.86	1.79	1.72	1.65	1.52

Ultimate tensile strength, ksi	135
0.2% yield strength, ksi	70
Elongation, %	45
Hardness, Rockwell B	100

Temperature, °C	21°C	204°C	427°C	538°C	649°C	760°C
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

	593°C	649°C	704°C	760°C
100 Hours, ksi	170	110	75	44
1,000 Hours, ksi	130	85	55	25

Mechanical & Physical Properties

Mechanical & Physical Properties	-196°C	21°C	93°C	204°C	316°C	538°C	649°C	760°C
Coefficient of Thermal Expansion µm/m⁰C	10.62	-	13.1	13.5	13.9	14.6	15.1	16
Thermal Conductivity /kcal/(hr.m.°C)	-	9.5	10.7	12.2	13.8	16.8	18.3	19.8
Modulus of Elasticity / x10⁵ MPa	-	2	1.93	1.86	1.79	1.72	1.65	1.52

Typical Room Temperature Properties, 982°C

Ultimate tensile strength, ksi	135
0.2% yield strength, ksi	70
Elongation, %	45
Hardness, Rockwell B	100

Average Tensile Properties, ½” Bar Annealed 982°C

Temperature, °C	21°C	204°C	427°C	538°C	649°C	760°C
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 982°C

	593°C	649°C	704°C	760°C
100 Hours, ksi	170	110	75	44
1,000 Hours, ksi	130	85	55	25

Specifications

UNS Number:: N07718
Werkstoff Number:: 2.4668
Standards:: ASTM B637, B670, AMS 5596, 5662, 5663, 5832

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