Alloy 263,Haynes 263 Pipe,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 Pipe / UNS N07263** **Alloy 263** (commercially 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 superior oxidation resistance. As a **pipe** product, it is engineered for demanding applications that involve the transport of hot gases, exhaust streams, or fluids under high pressure and temperature in aggressive environments. Haynes 263 pipe offers an ideal combination of high creep strength and good weldability, making it suitable for complex high-temperature piping systems in aerospace and energy sectors. It is commonly supplied in the solution-annealed condition for optimal formability and weldability, and can be age-hardened to achieve maximum strength properties. --- ### **1. Chemical Composition** The composition is precisely balanced to create a strong, stable microstructure through gamma-prime [Ni₃(Al, Ti)] precipitation. | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Austenitic matrix; provides base corrosion resistance and toughness. | | **Chromium (Cr)** | 19.0 - 21.0 | Imparts exceptional oxidation and hot corrosion resistance. | | **Cobalt (Co)** | 19.0 - 21.0 | Solid solution strengthener; boosts high-temperature strength. | | **Molybdenum (Mo)**| 5.6 - 6.1 | Provides solid solution strengthening, particularly at intermediate temperatures. | | **Titanium (Ti)** | 1.9 - 2.4 | Primary gamma-prime former (Ni₃Ti) for precipitation hardening. | | **Aluminum (Al)** | 0.3 - 0.6 | Gamma-prime former (Ni₃Al); aids oxidation resistance. | | **Carbon (C)** | 0.04 - 0.08 | Forms carbides for grain boundary strength 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. | | **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 (20-100°C)
16.8 μm/m·°C (20-800°C) | | **Modulus of Elasticity (Tensile)** | 211 GPa (30.6 x 10⁶ psi) @ 20°C | --- ### **3. Mechanical Properties (Typical for Pipe Product)** Pipe is typically supplied in the solution-annealed condition (Condition A) for fabrication and can be aged (Condition C) for maximum strength. **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 Performance:** Alloy 263 pipe retains excellent tensile, creep, and stress-rupture strength up to approximately **850°C (1560°F)**, making it suitable for pressurized systems at extreme temperatures. --- ### **4. Product Applications (Specific to Pipe Forms)** Alloy 263 pipe is specified for high-integrity systems requiring strength at temperature and corrosion resistance. * **Aerospace & Jet Engines:** * High-pressure compressor bleed air systems * Engine exhaust collector systems * Afterburner fuel and hydraulic piping * Hot gas ducting and manifolds * **Power Generation (Industrial Gas Turbines):** * Combustion chamber crossover pipes * Hot gas transfer lines * Exhaust system components * Turbine bypass systems * **Chemical & Process Industries:** * High-temperature heat exchanger tubing * Pyrolysis and reformer tubing * Components in processes involving corrosive atmospheres --- ### **5. International Standards for Pipe Products** Alloy 263 pipe conforms to various international standards governing seamless pipe and tubing. | Standard Type | Standard Number & Description | | :--- | :--- | | **Unified Numbering System (UNS)** | **UNS N07263** | | **Aerospace Material Specification (AMS)** | **AMS 5872** (Sheet, Strip, and Plate - often referenced for pipe)
**ASTM B829** (General Standard for Seamless Nickel Alloy Pipe) | | **American Society for Testing and Materials (ASTM)** | **ASTM B880**: General Specification for Pipe | | **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 | --- ### **Summary** **Alloy 263 (UNS N07263) Pipe** is a high-performance nickel-based superalloy product designed for the most demanding high-temperature piping applications. Its exceptional balance of elevated temperature strength, oxidation resistance, and fabricability (including weldability) makes it a critical material solution for aerospace propulsion systems, power generation turbines, and advanced industrial processes. The pipe form provides reliable performance in transporting aggressive media under high thermal and mechanical stress.

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 2121 gallon liquid totes Special package is available on request.