Alloy Wire International
Datasheet: Inconel® 718
Inconel® 718
Nickel-Chromium alloy being precipitation hardenable and having high creep-rupture strength at high temperatures to about 700°C (1290°F). It has higher strength than Inconel® X-750 and better mechanical properties at lower temperatures than Nimonic 90 and Inconel® X-750. Inconel® 718 has exceptional weldability compared to the Nickel-base super alloys hardened by Aluminium and Titanium.
Available in all profile options
Key Features
Inconel® 718 offers the following key features:
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^^
Typical Applications
Inconel® 718 is known to be suitable for the following applications:
Gas Turbines
Rocket Motors
Space Craft
Nuclear Reactors
Pumps
Oil & Gas Equipment
Designations
W.NR 2.4668
UNS N07718
AWS 013
Specifications
AMS 5662
AMS 5663
AMS 5832
AMS 5962
ASTM B637
GE B5OTF14/15
GE B14H89
ISO 15156-3
(NACE MR 0175)
API 6A718
Chemical Composition
The chemical composition of Inconel® 718 is indicated in the table below:
| 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 |
Alloy Details
Inconel® 718 density, melting point, coefficient of expansion, modulus of rigidity, and elasticity is indicated in the table below:
| Density | Melting Point | Coefficient of Expansion | Modulus of Rigidity | Modulus of Elasticity |
|---|---|---|---|---|
| 8.19g/cm³ | 133 6 °C | 13.0 μm/m °C (20 – 100 °C) | 77.2 kN/mm² | 204.9 kN/mm² |
| 0.296 lb/in³ | 2437 °F | 7.2 x 10-6 in/in °F (70 – 212 °F) | 11197 ksi | 29719 ksi |
Heat treatment of finished parts
The typical heat treatment of Inconel® 718:
| Condition as supplied by AWI | Type | Temperature | Time | Cooling |
|---|---|---|---|---|
| No. 1 or Spring Temper | Anneal Age Harden Total Age | 980 °C (1800 °F) 720 °C (1330 °F) 620 °C (1150 °F) | 1hr 8hr 18hr | Air Furnace Air |
| No. 1 or Spring Temper (for ISO 15156-3 / NACE MR 0175) | Anneal Age Harden | 1010 °C (1850 °F) 790 °C (1455 °F) | 2hr 6hr | Air Air |
| No. 1 Temper or Spring Temper | Age Harden Total Age | 720 °C (1330 °F) 620 °C (1150 °F) | 8hr 18hr | Furnace Air |
Properties
The typical mechanical properties of Inconel® 718:
| Annealed | ||
|---|---|---|
| Approx. tensile strength | <1000 N/mm² | <145 ksi |
| No. 1 Temper | ||
|---|---|---|
| Approx. tensile strength | 1000 – 1200 N/mm² | 145 – 175 ksi |
| Spring Temper | ||
|---|---|---|
| Approx. tensile strength | 1250 – 1550 N/mm² | 180 – 225 ksi |
| No. 1 Temper + Annealed + Aged | ||
|---|---|---|
| Approx. tensile strength | 1250 – 1450 N/mm² | 181 – 210 ksi |
| Approx. operating temperature depending on load^^ and environment | -200 to +550 °C | -330 to +1020 °F |
| No. 1 Temper + Aged | ||
|---|---|---|
| Approx. tensile strength | 1520 – 1720 N/mm² | 220 – 250 ksi |
| Approx. operating temperature depending on load^^ and environment | Contact Alloy Wire Technical Dept |
| Spring Temper + Annealed + Aged | ||
|---|---|---|
| Approx. tensile strength | 1250 – 1450 N/mm² | 181 – 210 ksi |
| Approx. operating temperature depending on load^^ and environment | -200 to +550 °C | -330 to +1020 °F |
| Spring Temper + Aged | ||
|---|---|---|
| Approx. tensile strength | 1700 – 1950 N/mm² | 247 – 283 ksi |
| Approx. operating temperature depending on load^^ and environment | Contact Alloy Wire Technical Dept |
The above tensile strength ranges are typical. If you require different please ask.
^^ Dynamic applications = active / lively / changing
