INCONEL alloy 783 Ni-Co-Fe Alloy,UNS R30783; AMS 5490，1

### **Product Introduction: INCONEL® Alloy 783 (UNS R30783)** **INCONEL® Alloy 783** is an advanced nickel-cobalt-iron superalloy specifically engineered to combine low thermal expansion characteristics with excellent oxidation resistance and high-temperature strength. This unique precipitation-hardenable alloy was developed to address the challenges of thermal expansion mismatch in gas turbine engines and other high-temperature applications where dimensional stability is critical. The alloy's optimized composition provides a unique combination of properties, including a low coefficient of thermal expansion similar to ferritic steels, while maintaining the high-temperature strength and oxidation resistance characteristic of nickel-based superalloys. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | 24.0 - 30.0 | | **Cobalt (Co)** | 25.0 - 30.0 | | **Iron (Fe)** | Balance | | **Chromium (Cr)** | 2.0 - 4.0 | | **Aluminum (Al)** | 4.8 - 5.8 | | **Niobium (Nb)** | 4.8 - 5.8 | | **Titanium (Ti)** | 0.3 - 0.8 | | **Carbon (C)** | 0.01 max | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.50 max | | **Sulfur (S)** | 0.005 max | | **Boron (B)** | 0.003 - 0.012 | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.09 g/cm³ | | **Melting Point** | 1395 - 1430 °C | | **Thermal Conductivity** | 13.5 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.05 μΩ·m | | **Modulus of Elasticity** | 195 GPa | | **Mean Coefficient of Thermal Expansion** | 10.5 - 12.5 × 10⁻⁶/°C (20-600°C) | | **Specific Heat Capacity** | 450 J/kg·K | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties** **Solution Annealed Condition:** - **Tensile Strength:** 690 - 860 MPa - **Yield Strength (0.2% Offset):** 310 - 480 MPa - **Elongation:** 25 - 35% - **Hardness:** 25 - 35 HRC **Aged Condition:** - **Tensile Strength:** 1030 - 1240 MPa - **Yield Strength (0.2% Offset):** 760 - 930 MPa - **Elongation:** 15 - 25% - **Hardness:** 35 - 42 HRC --- ### **Heat Treatment** **Standard Heat Treatment:** - **Solution Treatment:** 1120 - 1160°C (2050 - 2120°F), rapid cool - **Aging Treatment:** 845 - 870°C (1550 - 1600°F) for 4 hours, air cool + 720 - 745°C (1325 - 1375°F) for 8 hours, air cool **Special Considerations:** - Controlled cooling rates essential for optimal properties - Stress relief treatments available for specific applications --- ### **Key Characteristics & Advantages** 1. **Low Thermal Expansion** - Controlled thermal expansion coefficient matching ferritic steels - Excellent dimensional stability under thermal cycling - Reduced thermal stress in assembled components 2. **High-Temperature Capability** - Excellent oxidation resistance up to 870°C (1600°F) - Good creep and stress rupture strength - Maintains mechanical properties at elevated temperatures 3. **Precipitation Hardenable** - Enhanced strength through aging treatments - Stable microstructure during long-term exposure - Good combination of strength and ductility 4. **Oxidation Resistance** - Superior high-temperature oxidation resistance - Stable protective oxide layer formation - Good resistance to thermal fatigue --- ### **Product Applications** **Aerospace Industry:** - Gas turbine engine casings and frames - Turbine shrouds and seals - Engine mounting components - Exhaust system parts **Power Generation:** - Gas turbine components - Steam turbine parts - Power plant structural components - High-temperature fasteners **Industrial Applications:** - Thermal processing equipment - High-temperature fixtures - Precision measurement instruments - Specialized structural components --- ### **International Standards** | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **UNS** | R30783 | Unified Numbering System | | **AMS** | 5490 | Aerospace Material Specification | | **ASTM** | B909 | Guide for Plane Strain Fracture Toughness Testing | | **Customer Specifications** | Various | Application-specific requirements | --- ### **Summary** **INCONEL® Alloy 783 (UNS R30783)** represents a significant advancement in superalloy technology, offering a unique combination of low thermal expansion characteristics with the high-temperature strength and oxidation resistance expected from nickel-based superalloys. Its ability to match the thermal expansion of ferritic steels while maintaining superior high-temperature performance makes it particularly valuable for gas turbine engine applications where thermal expansion compatibility is critical. The alloy's precipitation-hardening capability provides excellent mechanical properties, while its optimized composition ensures reliable performance in demanding high-temperature environments. Certification to AMS 5490 and other international standards guarantees consistent quality and performance, providing engineers with an innovative material solution for applications requiring both dimensional stability and high-temperature capability in advanced aerospace and power generation systems.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3349 gallon liquid totes Special package is available on request.