Inconel 783 丨UNS R30783
Inconel 783 (UNS R30783) is a precipitation-hardened nickel-cobalt-iron alloy specifically engineered to provide an exceptional combination of high strength, oxidation resistance, and low thermal expansion. Designed for advanced gas turbine and aerospace applications, Alloy 783 maintains excellent dimensional stability at elevated temperatures while delivering superior mechanical performance. Its unique low coefficient of thermal expansion makes it ideal for turbine casings, seal rings, structural components, and other high-temperature systems where thermal distortion must be minimized. J&A Alloy supplies Inconel 783 in bar, forging, plate, and custom-machined forms with full material traceability and quality certification.
Inconel 783 Supplier & Manufacturer
Inconel 783 is an advanced precipitation-hardenable nickel-cobalt-iron alloy developed to bridge the performance gap between conventional superalloys and low-expansion alloys. The alloy combines excellent high-temperature strength, oxidation resistance, and thermal stability with a remarkably low coefficient of thermal expansion (CTE).
Unlike traditional nickel-based superalloys, Inconel 783 was specifically designed for applications requiring dimensional stability under severe thermal cycling conditions. Its unique composition enables the alloy to resist deformation while maintaining strength at temperatures approaching 700°C.
As a result, Alloy 783 has become a preferred material for gas turbine casings, seal rings, aerospace structures, and power generation equipment where thermal expansion control directly affects efficiency, reliability, and service life.
Features of Inconel 783
- Low coefficient of thermal expansion.
- Excellent dimensional stability.
- High strength after age hardening.
- Outstanding oxidation resistance.
- Good resistance to thermal fatigue.
- Excellent creep resistance.
- Superior thermal cycling performance.
- Good weldability and fabrication characteristics.
- Suitable for gas turbine components.
- Long-term stability at elevated temperatures.
Chemical Composition of Inconel 783
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 24.0 – 28.0 |
| Cobalt (Co) | 25.0 – 31.0 |
| Iron (Fe) | Balance |
| Chromium (Cr) | 2.5 – 3.5 |
| Aluminum (Al) | 5.2 – 5.8 |
| Niobium (Nb) | 2.7 – 3.3 |
| Titanium (Ti) | 0.1 – 0.5 |
| Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.50 |
| Carbon (C) | ≤ 0.05 |
Physical Properties of Inconel 783
| Property | Value |
|---|---|
| Density | 7.81 g/cm³ |
| Melting Range | 1315 – 1380°C |
| Electrical Resistivity | 0.98 μΩ·m |
| Thermal Conductivity | 12.0 W/m·K |
| Specific Heat Capacity | 460 J/kg·K |
| Modulus of Elasticity | 205 GPa |
Mechanical Properties of Inconel 783
Age-Hardened Condition
| Property | Value |
|---|---|
| Tensile Strength | ≥ 950 MPa |
| Yield Strength (0.2% Offset) | ≥ 690 MPa |
| Elongation | ≥ 20% |
| Hardness | Approx. 28 – 35 HRC |
Corrosion Resistance
Inconel 783 exhibits excellent resistance to oxidation and high-temperature atmospheric corrosion. The alloy forms a stable protective oxide layer that protects the material during long-term exposure to elevated temperatures.
While Alloy 783 is not intended for highly aggressive chemical processing environments like Hastelloy alloys, it offers excellent resistance to industrial oxidation, thermal cycling and combustion gas exposure. These characteristics make it highly suitable for turbine and power generation applications.
High Temperature Performance
| Property | Performance |
|---|---|
| Recommended Service Temperature | Up to 700°C |
| Oxidation Resistance | Excellent |
| Thermal Expansion Control | Outstanding |
| Thermal Fatigue Resistance | Excellent |
Available Forms
| Product Form | Availability |
|---|---|
| Bar | Round, Flat, Hex |
| Rod | Available |
| Plate | Available |
| Sheet | Available |
| Forgings | Available |
| Rings | Available |
| Custom Components | Available |
Applications of Inconel 783
- Gas turbine casings
- Turbine seal rings
- Combustion systems
- Aerospace structures
- Power generation equipment
- Thermal expansion control components
- Industrial turbine hardware
- High-temperature fastening systems
- Energy sector equipment
- Dimensional stability applications
Inconel 783 vs Other Alloys
| Property | Inconel 783 | Inconel 718 | Alloy 909 | A286 |
|---|---|---|---|---|
| Strength | Excellent | Excellent | Good | Good |
| Low Thermal Expansion | Outstanding | Moderate | Excellent | Poor |
| Oxidation Resistance | Excellent | Excellent | Limited | Good |
| Turbine Applications | Excellent | Excellent | Good | Moderate |
Welding & Fabrication
Inconel 783 can be welded using GTAW, GMAW, and other conventional nickel alloy welding methods. Proper heat treatment after fabrication is recommended to achieve optimum precipitation-hardening response and mechanical properties. The alloy also offers good machinability compared with many high-strength superalloys.
Standards & Equivalent Grades
| Standard | Designation |
|---|---|
| UNS | R30783 |
| Trade Name | Inconel 783 |
| Alloy Number | Alloy 783 |
| Material Type | Nickel-Cobalt-Iron Superalloy |
| Applications | Gas Turbines & Aerospace |
Frequently Asked Questions
What is Inconel 783?
Inconel 783 is a precipitation-hardened nickel-cobalt-iron alloy designed to provide high strength, excellent oxidation resistance, and an exceptionally low coefficient of thermal expansion.
What is Inconel 783 used for?
It is primarily used in gas turbine casings, seal rings, aerospace structures, and high-temperature components requiring dimensional stability.
What is the UNS number of Inconel 783?
The UNS designation is UNS R30783.
Why is Inconel 783 unique?
Its combination of high strength and low thermal expansion makes it ideal for applications where thermal distortion must be minimized.
Is Inconel 783 better than Inconel 718?
For thermal expansion control applications, Inconel 783 offers significant advantages. For maximum high-temperature strength, Inconel 718 remains a preferred choice.
What temperature can Inconel 783 withstand?
The alloy is commonly used at temperatures up to approximately 700°C while maintaining excellent dimensional stability.
Is Inconel 783 oxidation resistant?
Yes. The alloy offers excellent resistance to oxidation and high-temperature atmospheric corrosion.
Can Inconel 783 be welded?
Yes. Standard nickel alloy welding processes can be used, followed by appropriate heat treatment when required.
What industries use Inconel 783?
Gas turbine manufacturing, aerospace, power generation, and energy industries are the primary users.
What forms are available for Inconel 783?
Bar, rod, plate, sheet, forgings, rings, and custom-machined components are commonly supplied.
Why Choose J&A Alloy
J&A Alloy supplies premium nickel alloys and advanced superalloys for aerospace, turbine, and high-temperature industries worldwide.
Our advantages include:
- Full material traceability
- EN 10204 3.1 certification
- Custom forging and machining
- Strict quality control
- Global export experience
- Competitive lead times
- Technical material support
- Reliable international logistics
With extensive expertise in high-performance nickel alloys, J&A Alloy delivers dependable Inconel 783 solutions for the most demanding thermal stability and high-temperature applications.
