Inconel® 718

A Nickel-Chromium alloy being precipitation hardenable and having high creep-rupture strength at high temperatures to about 700oC (1290oF). It has higher strength than Inconel X-750 and better mechanical properties at lower temperatures than Nimonic 90 and Inconel X-750.

Inconel® 718 is also known as Nicrofer 5219, Superimphy 718, Haynes 718, Pyromet 718, Supermet 718. and Udimet 718.

AMS 5662
AMS 5663
AMS 5832
AMS 5962
ASTM B637
GE B5OTF14/15
GE B14H89
ISO 15156-3
(NACE MR 0175)
W.NR 2.4668
UNS N07718
AWS 013
Good creep rupture strength at high temperatures
Higher strength than Inconel X-750
Better mechanical properties at lower temperatures than Nimonic 90 & Inconel X-750
Age hardenable
High temperature dynamic applications▲
Gas Turbines
Rocket Motors
Space Craft
Nuclear Reactors
Pumps
Specifications
AMS 5662
AMS 5663
AMS 5832
AMS 5962
ASTM B637
GE B5OTF14/15
GE B14H89
ISO 15156-3
(NACE MR 0175)
W.NR 2.4668
UNS N07718
AWS 013
Good creep rupture strength at high temperatures
Higher strength than Inconel X-750
Better mechanical properties at lower temperatures than Nimonic 90 & Inconel X-750
Age hardenable
High temperature dynamic applications▲
Gas Turbines
Rocket Motors
Space Craft
Nuclear Reactors
Pumps

Chemical Composition

Element Min % Max %
C – 0.08
Mn – 0.35
Si – 0.35
P – 0.015
S – 0.015
Cr 17.00 21.00
Ni 50.00 55.00
Mo 2.80 3.30
Nb/Cb 4.75 5.50
Ti 0.65 1.15
Al 0.20 0.80
Co – 1.00
Ta – 0.05
B – 0.006
Cu – 0.30
Pb – 0.0005
Bi – 0.00003
Se – 0.0003
Fe bal

Density

8.19g/cm³ | 0.296 lb/in³

Melting Point

1336°C | 2437°F

Coefficient of Expansion

13.0 μm/m °C (20 – 100°C) | 7.2 x 10-6 in/in °F (70 – 212°F)

Modulus of Rigidity

77.2 kN/mm² | 11197 ksi

Modulus of Elasticity

204.9 kN/mm² | 29719 ksi

Heat Treatment of Finished Parts

Condition as supplied by Alloy Wire Type Temperature Time (Hr) Cooling
°C °F
No. 1 or Spring Temper Anneal
Age Harden
Total Age		 980
720
620		 1800
1330
1150		 1
8
18		 Air
Furnace
Air
No. 1 or Spring Temper
(for ISO 15156-3 / NACE MR 0175)		 Anneal
Age Harden		 1010
790		 1850
1455		 2
6		 Air
Air
No. 1 Temper or Spring Temper Age Harden
Total Age		 720
620		 1330
1150		 8
18		 Furnace
Air

Properties

Condition Approx. tensile strength Approx. operating temperature
N/mm² ksi °C °F
Annealed 800 – 1000 116 – 145 – –
No 1 Temper 1000 – 1200 145 – 175 – –
Spring Temper 1250 – 1550 180 – 225 – –
No 1 Temper + Annealed + Aged 1250 – 1450 181 – 210 -200 to +550 -330 to +1020
No 1 Temper + Aged 1520 – 1720 220 – 250 Contact Alloy Wire Technical Dept
Spring Temper + Annealed + Aged 1250 – 1450 181 – 210 -200 to +550 -330 to +1020
Spring Temper + Aged 1700 – 1950 247 – 283 Contact Alloy Wire Technical Dept
The above tensile strength ranges are typical. If you require different please ask.

* Static applications

▲ Dynamic applications = active / lively / changing

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