Inconel 718 AMS 5662
Inconel® 718 AMS 5662 available at Rockwell Industries (Inconel alloy 718, inco718, inc718, alloy718) is a nickel-chromium-molybdenum alloy designed to resist a wide range of corrosive environments, pitting and crevice corrosion. Rockwell Industries Inconel 718 nickel alloy also displays high tensile and creep-rupture properties at elevated temperatures. One of the distinguishing features of Inconel 718 material (ni alloy 718) composition is the addition of niobium to permit age hardening which allows annealing and welding without spontaneous hardening during heating and cooling. In addition, the niobium acts with the molybdenum to stiffen the alloy’s matrix and provide high strength without a strengthening heat treatment. Other popular nickel alloys are often age hardened through the addition of aluminum and titanium. This nickel steel alloy is readily fabricated and may be welded in either the annealed or precipitation (age) hardened condition.
Common applications are jet engine components, bolts, fasteners, afterburners, oil & gas. Rockwell Industries has Inconel 718 for sale in the following sizes below.
Stock sizes: 0.375” to 12.000” diameter
Common Specifications:
- AMS 5662, AMS 5664
- PWA-S-5662, CPW-A-5662
- B50TF15
- ASTM-B637
- ASME-SB637
- Pratt & Whitney LCS F-17
- General Electric S-400 / S-SPEC-35
- SPS-M-275
Industry Trade Names:
- Inconel 718
- Pyromet 718
- VDM 718
- ATI 718
- Nickel 718
Common Applications:
- Jet engines
- Aerospace fasteners
- Rocket motors
- Oil and gas shafts and wellhead components
Composition
| Element | Min. | Max. |
|---|---|---|
| Carbon | — | 0.8 |
| Manganese | — | 0.35 |
| Silicon | — | 0.35 |
| Phosphorus | — | 0.010 |
| Sulfur | — | 0.015 |
| Chromium | 17.00 | 21.00 |
| Nickel | 50.00 | 55.00 |
| Molybdenum | 2.80 | 3.30 |
| Copper | — | 0.30 |
| Columbium (Niobium) | 4.75 | 5.50 |
| Titanium | 0.65 | 1.15 |
| Aluminum | 0.20 | 0.80 |
| Cobalt | — | 1.00 |
| Boron | — | 0.006 |
| Lead | — | 0.0005 (5 ppm) |
| Bismuth | — | 0.00003 (0.3 ppm) |
| Selenium | — | 0.0003 (3ppm) |
| Iron | remainder |
Melt practice: VIM-VAR or VIM-ESR.
In the solution treated condition the maximum allowable hardness is 277HB.
The tensile property requirements at room temperature after the response to heat treatment are:
| Specimen Orientation | Diameter or Least Distance Between Parallel Sides, inch | Tensile Strength ksi | Yield Strength at 002% Offset ksi | Elongation in 4D% | Reduction of Area % |
|---|---|---|---|---|---|
| Longitudinal | Up to 10.00, incl. | 185 | 150 | 12 | 15 |
| Long-Transverse (Forgings) | Up to 5.00, incl ——————- Over 5.00 to 10.00, incl | 180 —— 180 | 150 —— 145 | 10 —— 10 | 12 —— 12 |
| Transverse (Bars) | Up to 5.00, incl ——————- Over 5.00 to 10.00, incl | 180 —— 180 | 150 —— 145 | 6 —— 6 | 8 —— 8 |
The tensile property requirements at 1200 degrees F after the response to heat treatment are:
| Specimen Orientation | Diameter or Least Distance Between Parallel Sides, inch | Tensile Strength ksi | Yield Strength at 002% Offset ksi | Elongation in 4D% | Reduction of Area % |
|---|---|---|---|---|---|
| Longitudinal | Up to 5.00, incl ——————- Over 5.00 to 10.00, incl | 145 —— 145 | 125 —— 122 | 12 —— 12 | 15 —— 15 |
| Long-Transverse (Forgings) | Up to 5.00, incl ——————- Over 5.00 to 10.00, incl | 140 —— 140 | 125 —— 122 | 10 —— 10 | 12 —— 12 |
| Transverse (Bars) | Up to 5.00, incl ——————- Over 5.00 to 10.00, incl | 140 —— 140 | 125 —— 122 | 6 —— 6 | 8 —— 8 |
