Inconel® 718 AMS 5662

Inconel 718 is a nickel-chromium-molybdenum alloy designed to resist a wide range of corrosive environments, pitting and crevice corrosion. This nickel alloy also displays high tensile and creep-rupture properties at elevated temperatures.  One of the distinguishing features of Inconel 718’s composition is the addition of niobium to permit age hardening which allows annealing and welding without spontaneous hardening during heating and cooling. The 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.

Common stock sizes: .500” to 12.000” diameters.

Common Specifications:

  • AMS 5662, AMS 5663, 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
Rockwell-Industries-Intl-Inconel-718-Alloy-AMS-5662-image

Composition

Element Min. Max.
Carbon 0.38 0.43
Manganese 0.65 0.90
Silicon 0.15 0.35
Phosphorus -- 0.010
Sulfur -- 0.010
Chromium 0.70 0.90
Nickel 1.65 2.00
Molybdenum 0.20 0.30
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)
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

The minimum hardness requirement after precipitation hardening is 331 HB.