Inconel 706
Short Description:
Introduction Super alloys are also known as high performance alloys. They have good creep and oxidation resistance, and are formed in different shapes. They can be strengthened by solid-solution hardening, work hardening, and precipitation hardening. They are classified into three groups such as cobalt-based, nickel-based, and iron-based alloys. They have the ability to function under high temperatures and severe mechanical stress, and also where high surface stability is required. Inconel 70...
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Introduction
Super alloys are also known as high performance alloys. They have good creep and oxidation resistance, and are formed in different shapes. They can be strengthened by solid-solution hardening, work hardening, and precipitation hardening. They are classified into three groups such as cobalt-based, nickel-based, and iron-based alloys. They have the ability to function under high temperatures and severe mechanical stress, and also where high surface stability is required.
Inconel 706™ is a nickel-chromium-iron precipitation-hardening alloy. The following datasheet gives an overview of Inconel 706™.
Chemical Composition
The following table shows the chemical composition of Inconel 706™.
| Elements | Content (%) |
| Nickel, Ni | 39-44 |
| Iron, Fe | 38 |
| Chromium, Cr | 14.5-17.5 |
| Niobium, Nb | 2.50-3.30 |
| Cobalt, Co | ≤ 1 |
| Titanium, Ti | ≤ 0.40 |
| Copper, Cu | ≤ 0.35 |
| Manganese, Mn | ≤ 0.35 |
| Silicon, Si | ≤ 0.35 |
| Carbon, C | ≤ 0.30 |
| Aluminum, Al | ≤ 0.060 |
| Phosphorous, P | ≤ 0.020 |
| Sulfur, S | ≤ 0.015 |
| Boron, B | ≤ 0.0060 |
Physical Properties
The physical properties of Inconel 706™ are outlined in the following table.
| Properties | Metric | Imperial |
| Density | 8.05 g/cm³ | 0.291 lb/in³ |
| Melting point | 1360°C | 2480°F |
Mechanical Properties
The mechanical properties of Inconel 706™ are given in the following table.
| Properties | Metric | Imperial |
| Tensile strength | 757 MPa | 109800 psi |
| Yield strength (at strain 0.200%) | 383 MPa | 55500 psi |
| Poisson’s ratio (precipitation hardened, calculated by mfr) | 0.382 | 0.382 |
| Modulus of elasticity (precipitation hardened, dynamic method) | 210 GPa | 30500 ksi |
| Elongation at break | 47% | 47% |
Thermal Properties
The thermal properties of Inconel 706™ are displayed in the following table.
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (at 24-100°C/75.2-212°F) | 13.46 µm/m°C | 7.478 µin/in°F |
| Thermal conductivity | 12.5 W/mK | 86.8 BTU in/hr.ft².°F |
Other designations that are equivalent to Inconel 706™ include:
AMS 5605
AMS 5606
AMS 5701
AMS 5702
AMS 5703
Fabrication and Heat Treatment
Machinability
Inconel 706™ can be machined using conventional machining methods which are used for iron-based alloys. Machining operations are performed using commercial coolants. High speed operations such as grinding, milling, or turning are performed using water-based coolants.
Forming
Inconel 706™ can be formed using all conventional techniques.
Welding
Inconel 706™ is welded using gas-tungsten arc welding, shielded metal-arc welding, submerged-arc welding, and gas metal-arc welding methods.
Heat Treatment
Inconel 706™ is heat treated by annealing at 927 to 1010°C (1700 to 1850°F) followed by cooling.
Forging
Inconel 706™ is forged at 983 to 1149°C (1800 to 2100°F).
Hot Working
Inconel 706™ is hot worked at 872 to 1149°C (1600 to 2100°F).
Cold Working
Inconel 706™ is cold worked using standard tooling.
Annealing
Inconel 706™ is annealed at 927 to 1010°C (1700 to 1850°F) followed by cooling.
Hardening
Inconel 706™ is hardened by heat treatment.
Applications
Inconel 706™ is mainly used in gas turbines for shafts, cases, turbine discs, and fasteners.
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