Alloy 263,Haynes 263 Other/Similar Specs,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 Data Sheet: Alloy 263 / Haynes 263 (UNS N07263) - Specifications & Equivalents** **Overview** **Alloy 263** (commercially known as **Haynes 263** and standardized as **UNS N07263**) is a premier precipitation-hardenable nickel-cobalt-chromium superalloy. It is renowned for its excellent combination of **high-temperature strength, outstanding fabricability (including welding and forming), and superior oxidation resistance**. This datasheet provides a consolidated view of the alloy, detailing its core properties and the extensive range of international and proprietary specifications it meets. This makes UNS N07263 a globally recognized and specified material for critical applications across aerospace, energy, and industrial sectors. --- #### **1. Chemical Composition** The consistent chemical composition is the foundation of its reliable performance across all product forms. | Element | Content (%) (Typical / Range) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Austenitic matrix; provides 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. | | **Molybdenum (Mo)** | 5.6 - 6.1 | Provides solid solution strengthening and creep resistance. | | **Titanium (Ti)** | 1.9 - 2.4 | Primary precipitation hardener (forms γ' phase, Ni₃(Ti,Al)). | | **Aluminum (Al)** | 0.3 - 0.6 | Secondary precipitation hardener; contributes to the γ' phase. | | **Carbon (C)** | 0.04 - 0.08 | Enhances strength through carbide formation at grain boundaries. | | **Manganese (Mn)** | 0.60 max | Aids in manufacturability. | | **Silicon (Si)** | 0.40 max | Improves oxidation resistance. | | **Iron (Fe)** | 0.70 max | Residual element. | | **Boron (B)** | 0.005 max | Strengthens grain boundaries to improve creep life. | | **Zirconium (Zr)** | 0.06 max | Trace element to enhance creep properties. | --- #### **2. Physical Properties (Typical)** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.36 g/cm³ (0.302 lb/in³) | | **Melting Range** | 1330 - 1360 °C (2425 - 2480 °F) | | **Specific Heat** | 420 J/kg·K (0.10 Btu/lb·°F) @ 20°C | | **Thermal Conductivity**| 11.6 W/m·K (80.4 Btu·in/hr·ft²·°F) @ 20°C | | **Mean Coeff. of Thermal Expansion** | 12.6 x 10⁻⁶/°C (20 - 100°C) | | | 16.8 x 10⁻⁶/°C (20 - 800°C) | | **Modulus of Elasticity** | 211 GPa (30.6 x 10⁶ psi) @ 20°C | --- #### **3. Key Characteristics & Mechanical Properties** Alloy 263 is typically supplied in a solution-annealed condition for fabrication and achieves its high strength through a subsequent aging heat treatment. * **High Strength:** Excellent short-term tensile and long-term creep rupture strength up to ~900°C (~1650°F). * **Excellent Oxidation Resistance:** Capable of prolonged service in oxidizing atmospheres up to 980°C (1800°F). * **Superior Fabricability:** Exhibits good formability and weldability compared to other high-strength nickel-based superalloys. * **Precipitation Hardenable:** Gains its strength from gamma prime (γ') precipitates formed during aging. **Typical Mechanical Properties (Aged Condition)** * **Tensile Strength:** 950 - 1250 MPa (138 - 180 ksi) * **Yield Strength (0.2% Offset):** 550 - 850 MPa (80 - 123 ksi) * **Elongation:** 20 - 30% --- #### **4. Product Applications** Alloy 263 is versatile and used in various product forms for high-temperature applications. * **Aerospace & Gas Turbine Engines:** * **Combustion Chambers & Liners** (Sheet/Strip) * **Turbine Disks & Spacers** (Forgings) * **Casings, Shrouds, and Seals** (Sheet/Forgings) * **Exhaust Components** (Sheet/Pipe) * **High-Strength Fasteners** (Bar) * **Power Generation:** * **Hot Gas Path Components** in land-based gas turbines. * **Industrial Processing:** * **High-Temperature Fixtures, Heat Treatment Tools.** --- #### **5. International & Proprietary Standards** UNS N07263 is covered by a comprehensive set of international, national, and original equipment manufacturer (OEM) specifications. | Country/Region | Standard Type | Standard Number | Description / Product Form | | :--- | :--- | :--- | :--- | | **International** | **UNS** | **N07263** | Unified Numbering System - All forms | | **USA** | **ASTM** | B906 | Standard Specification for General Requirements for Flat-Rolled Nickel and Cobalt Alloys (Plate, Sheet, Strip) | | | **ASTM** | B564 | Standard Specification for Nickel Alloy Forgings | | | **ASTM** | B366 | Standard Specification for Factory-Made Wrought Nickel Alloy Fittings | | **USA** | **Aerospace (AMS)** | **AMS 5872** | Bars, Forgings, and Rings (Solution & Precipitation Treated) | | | **Aerospace (AMS)** | **AMS 5876** | Sheet, Strip, and Plate (Solution Annealed) | | **Europe** | **EN** | **2.4650** | Material Number (Werkstoff Nr.) - All forms | | | **EN** | EN 10302 | Creep resisting steel, nickel and cobalt alloys | | **UK** | **British Standard** | BS HR 203 | Sheet and Plate | | **France** | **Aeronautical** | AIR 9161 / AC 263 | French aerospace standard | | **OEM** | **Pratt & Whitney** | PWA 1104 | Proprietary material specification | | **OEM** | **General Electric** | GE S-400 | Proprietary material specification | | **OEM** | **Rolls-Royce** | RRS 70032 | Proprietary material specification | --- **Summary** **Alloy 263 (Haynes 263, UNS N07263)** is a globally accepted and highly versatile superalloy whose reputation is built on a robust balance of properties. Its extensive qualification against a wide array of international (ASTM, AMS, EN) and proprietary (PWA, GE) standards underscores its reliability and performance consistency. This makes it a preferred, "go-to" material for engineers designing critical components that must withstand extreme temperatures and stresses while maintaining structural integrity over long service lifetimes.

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 2128 gallon liquid totes Special package is available on request.