NIMONIC Alloy 263,Nickel-Chromium Alloy; Werkstoff Nr. 2.4650, UNS N07263; 1

### **Product Introduction: NIMONIC® Alloy 263** **NIMONIC® Alloy 263** is an advanced precipitation-hardenable nickel-chromium-cobalt superalloy specifically developed for high-temperature applications requiring an optimal balance of strength, fabricability, and oxidation resistance. This alloy is particularly distinguished by its excellent combination of high-temperature mechanical properties and good formability, making it especially suitable for sheet metal components in gas turbine engines operating at temperatures up to 850°C (1562°F). The alloy's optimized chemistry provides superior weldability without the need for post-weld heat treatment, while maintaining excellent resistance to thermal fatigue and oxidation. Its well-balanced composition allows for good creep resistance combined with exceptional stability during long-term exposure at elevated temperatures. --- ### **Chemical Composition** The chemical composition is engineered to provide optimal performance in high-temperature environments: | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 19.0 - 21.0 | | **Cobalt (Co)** | 19.0 - 21.0 | | **Molybdenum (Mo)** | 5.6 - 6.1 | | **Titanium (Ti)** | 1.9 - 2.4 | | **Aluminum (Al)** | 0.3 - 0.6 | | **Iron (Fe)** | 0.7 max | | **Carbon (C)** | 0.04 - 0.08 | | **Manganese (Mn)** | 0.6 max | | **Silicon (Si)** | 0.4 max | | **Copper (Cu)** | 0.2 max | | **Boron (B)** | 0.005 max | --- ### **Physical Properties** Nimonic Alloy 263 exhibits well-balanced physical properties for high-temperature service: | Property | Value | | :--- | :--- | | **Density** | 8.36 g/cm³ | | **Melting Point** | 1350-1400 °C | | **Thermal Conductivity** | 12.5 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.25 μΩ·m | | **Modulus of Elasticity** | 220 GPa (at 20°C) | | **Coefficient of Thermal Expansion** | 13.9 μm/m·°C (20-800°C) | | **Specific Heat Capacity** | 440 J/kg·K | | **Magnetic Permeability** | <1.01 | --- ### **Mechanical Properties** The alloy demonstrates excellent mechanical performance across its operating range: **Room Temperature Properties (Solution Treated and Aged):** - **Tensile Strength:** 950-1150 MPa - **Yield Strength (0.2% Offset):** 550-750 MPa - **Elongation:** 25-35% - **Hardness:** 25-35 HRC **High-Temperature Performance:** - **Creep Rupture Strength (750°C/100h):** 250 MPa - **Fatigue Strength (700°C):** 350 MPa - **Stress Rupture Life (800°C/200MPa):** >100 hours --- ### **Heat Treatment** **Standard Heat Treatment:** - **Solution Treatment:** 1150°C ± 10°C, 2 hours, air cool - **Aging Treatment:** 800°C ± 10°C, 8 hours, air cool **Alternative Treatments Available:** - For optimized creep resistance - For enhanced thermal fatigue performance --- ### **Key Characteristics & Advantages** 1. **Excellent High-Temperature Strength** - Good creep and stress rupture properties up to 850°C - Maintains mechanical properties during prolonged exposure - Excellent thermal fatigue resistance 2. **Superior Fabricability** - Excellent weldability without post-weld heat treatment - Good formability and machinability - Suitable for complex sheet metal fabrication 3. **Outstanding Environmental Resistance** - Excellent oxidation resistance up to 1000°C - Good resistance to hot corrosion - Stable microstructure during long-term service 4. **Well-Balanced Properties** - Optimal combination of strength and ductility - Good thermal stability - Consistent performance across temperature range --- ### **Product Applications** **Aerospace Industry:** - Combustion chamber components - Afterburner liners and components - Exhaust system parts - Turbine casings and rings - Hot air ducts **Power Generation:** - Industrial gas turbine components - Combustion liners and transition pieces - Heat exchangers - Hot gas path components **Specialized Applications:** - Rocket engine components - High-temperature fasteners - Nuclear engineering components - High-temperature instrumentation --- ### **International Standards** Nimonic Alloy 263 is comprehensively covered by major international specifications: | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Werkstoff Nr.** | 2.4650 | Material Number | | **UNS** | N07263 | Unified Numbering System | | **BS** | HR10, HR206, HR404 | British Standards | | **SAE AMS** | 5872 | Aerospace Material Specification | | **WL Nr.** | 2.4650 | Alternative Material Number | | **AFNOR** | NCK 20D | French Standard | | **AECMA** | Pr EN 2199-2203, 2418 | European Aerospace Standards | --- ### **Summary** **NIMONIC Alloy 263** represents a highly versatile nickel-chromium-cobalt superalloy that offers an exceptional balance of high-temperature strength, fabricability, and environmental resistance. Its carefully optimized composition provides superior weldability and formability while maintaining excellent mechanical properties at temperatures up to 850°C, making it particularly valuable for complex sheet metal components in gas turbine engines. The alloy's ability to be fabricated into intricate shapes without compromising high-temperature performance, combined with its stability during long-term service, establishes it as a preferred material for combustion systems and exhaust components in both aerospace and industrial gas turbine applications. Comprehensive certification to major international standards including Werkstoff 2.4650, UNS N07263, BS HR series, and AECMA Pr EN specifications ensures consistent quality and reliability across global aerospace and power generation industries, providing engineers with a proven solution for demanding high-temperature applications.

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 3318 gallon liquid totes Special package is available on request.