Alloy 263,Haynes 263 Rod,UNS N07263,E FORU

British Specs:BS HR10 BS HR206 BS HR404，American Specs:AMS 5872 Sheet Strip and Plate AMS 5886 Bar and Forgings，German Specs:WS 2.4650

### **Product Introduction: Alloy 263 / Haynes 263 Rod / UNS N07263** **Alloy 263** (commonly known as **Haynes 263** and standardized as **UNS N07263**) is a precipitation-hardenable nickel-chromium-cobalt superalloy renowned for its exceptional high-temperature strength, outstanding fabricability, and excellent thermal stability. It was specifically developed to fill the gap between traditional solid-solution-strengthened alloys like Hastelloy X and more complex, less fabricable gamma-prime hardened alloys. This alloy is a premier choice for applications in the hottest sections of gas turbines and aero-engines, where a combination of high strength, good fatigue resistance, and superior oxidation resistance is paramount. It is readily available in forms such as rods, bars, forgings, sheets, and plates. --- ### **1. Chemical Composition** The composition of Alloy 263 is carefully balanced to provide an optimal mix of strength, stability, and environmental resistance. The key strengthening mechanism is the precipitation of the gamma-prime phase [Ni₃(Al, Ti)]. | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the austenitic matrix, providing inherent corrosion resistance and toughness. | | **Chromium (Cr)** | 19.0 - 21.0 | Confers excellent oxidation and hot corrosion resistance. | | **Cobalt (Co)** | 19.0 - 21.0 | Solid solution strengthener; enhances high-temperature strength and thermal stability. | | **Molybdenum (Mo)**| 5.6 - 6.1 | Provides solid solution strengthening, particularly at intermediate temperatures. | | **Titanium (Ti)** | 1.9 - 2.4 | Forms the gamma-prime phase (Ni₃Ti), the primary strengthening precipitate. | | **Aluminum (Al)** | 0.3 - 0.6 | Forms the gamma-prime phase (Ni₃Al) and contributes to oxidation resistance. | | **Carbon (C)** | 0.04 - 0.08 | Forms carbides for grain boundary strengthening and creep resistance. | | **Boron (B)** | 0.005 max | Enhances creep ductility and grain boundary strength. | | **Manganese (Mn)**| 0.60 max | Aids in deoxidation during melting. | | **Silicon (Si)** | 0.40 max | Aids in deoxidation during melting. | | **Iron (Fe)** | 0.70 max | Residual element; kept low to maintain performance. | | **Copper (Cu)** | 0.20 max | Residual element; kept low to prevent hot shortness. | --- ### **2. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.36 g/cm³ (0.302 lb/in³) | | **Melting Range** | 1330 - 1360 °C (2425 - 2480 °F) | | **Specific Heat** | 455 J/kg·K (0.109 Btu/lb·°F) @ 20°C | | **Thermal Conductivity**| 11.7 W/m·K (81.0 Btu·in/hr·ft²·°F) @ 20°C | | **Mean Coefficient of Thermal Expansion** | 12.6 μm/m·°C (7.0 μin/in·°F) @ 20-100°C
16.8 μm/m·°C (9.3 μin/in·°F) @ 20-800°C | | **Electrical Resistivity** | 1.25 μΩ·m @ 20°C | | **Modulus of Elasticity (Tensile)** | 211 GPa (30.6 x 10⁶ psi) @ 20°C | --- ### **3. Mechanical Properties** Alloy 263 is typically supplied in the solution-annealed condition (condition A) and is then age-hardened (condition C) to achieve its peak strength. **Typical Room Temperature Tensile Properties (After Full Heat Treatment):** * **Ultimate Tensile Strength:** 950 - 1100 MPa (138 - 160 ksi) * **Yield Strength (0.2% Offset):** 550 - 700 MPa (80 - 102 ksi) * **Elongation:** 25 - 35% **High-Temperature Capability:** Alloy 263 retains excellent strength up to approximately 850°C (1560°F). Its creep and stress-rupture strength are superior to many other sheet and plate alloys in this temperature range. --- ### **4. Product Applications** Alloy 263 is primarily used in the aerospace and power generation industries due to its superb high-temperature performance. * **Aerospace:** * Gas turbine combustion chambers and liners * Afterburner components * Turbine casings and rings * Exhaust components * Hot section structural parts * **Power Generation:** * Industrial gas turbine components (transition ducts, casings) * Combustion cans and liners --- ### **5. International Standards** Alloy 263 is covered by numerous international and industry-specific standards, ensuring consistent quality and performance. | Standard Type | Standard Number & Description | | :--- | :--- | | **Unified Numbering System (UNS)** | **UNS N07263** | | **Aerospace (AMS)** | **AMS 5872**: Sheet, Strip, and Plate
**AMS 5873**: Bar and Forgings (Solution Annealed) | | **Aeromatic Material Specification (AMS)** | **AMS 5880**: Bar and Forgings (Solution Annealed and Aged) | | **European (EN)** | **EN 10302**: Nickel and Cobalt Alloys
**2.4634** (Material Number) | | **German (DIN/Werkstoff)** | **Werkstoff Nr. 2.4650** | | **ISO** | **ISO 9724**: Nickel-cobalt-chromium-molybdenum alloy for aerospace applications | --- ### **Summary** **Alloy 263 (UNS N07263)** is a versatile, high-performance nickel-based superalloy that offers an outstanding balance of high-temperature strength, oxidation resistance, and fabricability. Its ability to be readily formed and welded in the solution-annealed condition and then precipitation-hardened to achieve high strength makes it an ideal and cost-effective choice for critical components in the most demanding high-temperature environments of modern gas turbine engines.

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 2119 gallon liquid totes Special package is available on request.