Alloy 263,Haynes 263 Tube,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 Tube / UNS N07263** **Alloy 263** (commercially known as **Haynes 263** and standardized as **UNS N07263**) is a precipitation-hardenable nickel-chromium-cobalt superalloy specifically engineered for exceptional high-temperature strength, outstanding fabricability, and superior oxidation resistance. As a **tubular** product, it is designed for critical applications involving the conveyance of hot gases, hydraulic fluids, or fuel under extreme pressure and temperature conditions in aerospace, energy, and industrial settings. Haynes 263 tubing offers an optimal balance of high creep strength, excellent fatigue resistance, and good weldability. It is typically supplied in a solution-annealed condition, providing optimal formability for bending and welding into complex systems, and can be precipitation-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 Tubular Product)** Tubing 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 tubing 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 Tubular Forms)** Alloy 263 tubing is specified for high-integrity systems requiring strength at temperature and corrosion resistance. * **Aerospace & Jet Engines:** * **Hydraulic and Oil Lines:** High-pressure tubing for engine and airframe systems. * **Fuel Feed Lines:** Tubing for fuel conveyance in hot sections. * **Bleed Air Systems:** Transport of high-pressure, high-temperature air from compressor sections. * **Actuator and Sensing Lines:** Tubing for control and instrumentation systems. * **Heat Exchanger Tubing:** For aircraft environmental control systems (ECS). * **Power Generation (Industrial Gas Turbines):** * **Heat Exchanger Tubing:** For recuperators and intercoolers. * **Instrumentation and Sensing Lines:** Tubing for temperature and pressure monitoring. * **Cooling Air Lines:** For internal turbine component cooling systems. * **General Engineering:** * Tubing for high-temperature furnace components. * Components in test and simulation equipment requiring reliable fluid conveyance under stress. --- ### **5. International Standards for Tubular Products** Alloy 263 tubing conforms to various international standards governing seamless 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 mechanical properties)
**ASTM B751** (General Standard for Nickel Alloy Tubing) | | **American Society for Testing and Materials (ASTM)** | **ASTM B880**: General Specification for Tube | | **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) Tube** is a high-performance nickel-based superalloy product designed for the most demanding high-temperature tubular applications. Its exceptional balance of elevated temperature strength, oxidation resistance, and fabricability (including weldability and bendability) makes it a critical material solution for aerospace hydraulic and fuel systems, power generation turbines, and advanced industrial processes. The tubular form provides reliable performance in conveying fluids and gases 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 2122 gallon liquid totes Special package is available on request.