Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
Inconel 783 is an oxidation-resistant, low-expansion nickel-cobalt-iron alloy with aluminium, chromium and niobium additions. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
One of the newest high-performance superalloys developed by Special Metals (US Patent 5,478,417), Inconel 783 is a three-phase age-hardenable alloy in which the high aluminium content forms not only the gamma-prime (γ′) phase but also a beta (β, NiAl) aluminide phase in the austenitic matrix. This structure can be processed to resist both stress-accelerated grain-boundary oxidation (SAGBO) and general oxidation while providing a low coefficient of thermal expansion — about 20% lower than that of alloy 718 — and useful mechanical properties up to about 700 °C. It shows excellent resistance to oxidation in cyclic tests at temperatures up to and beyond 704 °C (1300 °F), and SAGBO resistance comparable to alloy 718. It is supplied in the solution-treated and aged condition.
Typical applications include aircraft gas-turbine containment and clearance-control components — rings, casings, shrouds and seals for compressors, turbines and exhaust systems.
| Property | Value | Unit |
|---|---|---|
| Density | 7.81 | g/cm³ |
| Melting range | 1380–1430 | °C |
| Elastic modulus | 152 | GPa |
| Coefficient of thermal expansion (20–540 °C) | 9.5 | µm/m·°C |
| Thermal conductivity (20 °C) | 12.0 | W/m·K |
| Specific heat (20 °C) | 435 | J/kg·K |
| Structure | Austenitic (FCC) + β-NiAl | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Cobalt | Co | Balance | — | Base element |
| Nickel | Ni | 26.0 | 30.0 | Matrix; γ′ / β former |
| Iron | Fe | 24.0 | 27.0 | Low-expansion matrix |
| Aluminium | Al | 5.0 | 6.0 | γ′ and β (NiAl) formation; oxidation resistance |
| Niobium | Nb | 2.5 | 3.5 | γ′ precipitation strengthening |
| Chromium | Cr | 2.5 | 3.5 | Oxidation resistance |
| Carbon | C | — | 0.03 | Carbide formation |
| Boron | B | 0.003 | 0.012 | Grain-boundary strengthening |
Solution-treated and aged condition, typical values for UNS R30783.
| Condition | Property | Value |
|---|---|---|
| Solution treated & aged | Tensile strength (UTS) | ≥1000 MPa (145 ksi) |
| Solution treated & aged | 0.2% yield strength | ≥690 MPa (100 ksi) |
| Solution treated & aged | Elongation at break | ≥15 % |
| Solution treated & aged | Reduction of area | ≥20 % |
| — | Elastic modulus | 152 GPa |
Confirm against the mill test report. The alloy retains useful mechanical properties up to about 700 °C with a coefficient of thermal expansion about 20% below that of alloy 718.
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation (cyclic) | Excellent | Aluminium-rich; to and beyond 704 °C |
| SAGBO (stress-accelerated GB oxidation) | Excellent | Comparable to alloy 718, better than 909 |
| Oxygen embrittlement | Very Good | Resistant; notch ductility retained |
| Aqueous / general | Good | Moderate chromium |
| Low thermal expansion | Excellent | ~20% lower than alloy 718 |
The high aluminium content provides excellent resistance to general oxidation and to stress-accelerated grain-boundary oxidation while maintaining a low coefficient of thermal expansion — the combination sought for gas-turbine clearance-control hardware.
A three-phase (γ′ + β) age-hardenable alloy; strengthened by solution treatment followed by beta ageing and precipitation ageing.
Solution Treatment Solution anneal at approximately 1121 °C (2050 °F) for about 1 hour and air cool.
Precipitation Hardening (Ageing) Beta-age at approximately 845 °C (1550 °F) for 4 hours and air cool, then age at approximately 720 °C (1325 °F) for 8 hours, furnace cool at about 55 °C/h to 620 °C (1150 °F), hold 8 hours and air cool — precipitating γ′ and the β (NiAl) phase.
Good weldability; the alloy can be formed, machined and welded using the conventional procedures for nickel alloys, in the solution-annealed condition with post-weld ageing.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching alloy 783 filler |
| GMAW / MIG | Good | Matching filler |
| EBW / laser | Good | Autogenous or matching filler |
Weld in the solution-annealed condition; apply post-weld solution and ageing treatment to develop properties.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Rough machine annealed, then age, then finish |
| Machinability | Difficult; rigid setups, carbide tooling, slow speeds |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | In the annealed condition; work-hardens |
| Hot forming | ~927–1121 °C (1700–2050 °F); solution and age afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Aero gas turbine | Containment rings, casings | Low expansion + oxidation resistance |
| Turbine / compressor | Shrouds, seals, clearance-control parts | Dimensional stability + SAGBO resistance |
| Exhaust systems | Rings and seals | Oxidation resistance to >704 °C |
| Aerospace | Clearance-control hardware | Low CTE + useful strength to 700 °C |
| Product Form | Standard / Designation | Notes |
|---|---|---|
| Forging billet | AMS 5940 | UNS R30783 |
| Rod and bar (machining) | UNS R30783 | Special Metals product |
| Extruded section and wire rod | UNS R30783 | — |
| Material designation | UNS R30783 | US Patent 5,478,417 |
Oxidation-resistant low-expansion nickel-cobalt-iron alloy. UNS R30783.
| Alloy | Type | CTE Trend | Strengthening | Best Used For |
|---|---|---|---|---|
| Inconel 783 | Ni-Co-Fe + Al | Low (~20% < 718) | γ′ + β (NiAl) | Low-expansion, oxidation-resistant; gas-turbine clearance control |
| Incoloy 909 | Fe-Ni-Co | Very low | γ′ (Nb, Ti) | Low-expansion gas-turbine parts |
| Incoloy 907 | Fe-Ni-Co | Very low | γ′ (Nb, Ti) | Low-expansion rings and shafts |
| Inconel 718 | Ni-Cr-Fe | Standard | γ′ + γ″ (Nb, Ti) | Most-used high-strength superalloy |
| Inconel X-750 | Ni-Cr | Standard | γ′ (Al, Ti) | Springs, bolts, high-temperature fasteners |
