Alloy 263,Haynes 263 Forgings,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 Forgings (UNS N07263)** **Overview** **Alloy 263** (commercially known as **Haynes 263** and standardized as **UNS N07263**) is a precipitation-hardenable nickel-cobalt-chromium superalloy specifically engineered for high-temperature service. It delivers an exceptional balance of **high tensile and creep strength, outstanding oxidation resistance, and good fabricability**. In the form of **forgings**, Alloy 263 is utilized for critical components that require superior structural integrity, reliability, and performance under extreme mechanical stress and temperatures. The forging process refines the alloy's grain structure, enhances its mechanical properties, and ensures soundness in highly stressed directions, making it the preferred manufacturing route for the most demanding rotating and static components in aerospace and power generation. --- #### **1. Chemical Composition** The composition is precisely controlled to optimize high-temperature strength, creep resistance, and environmental resistance. | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the austenitic matrix, providing base corrosion resistance and toughness. | | **Chromium (Cr)** | 19.0 - 21.0 | Imparts superior resistance to oxidation and hot corrosion. | | **Cobalt (Co)** | 19.0 - 21.0 | Solid solution strengthener; significantly enhances high-temperature strength. | | **Molybdenum (Mo)** | 5.6 - 6.1 | Provides solid solution strengthening and resistance to creep deformation. | | **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 | Forms carbides for grain boundary strength and stability. | | **Manganese (Mn)** | 0.60 max | Aids in manufacturability and controls sulfur. | | **Silicon (Si)** | 0.40 max | Enhances oxidation resistance. | | **Iron (Fe)** | 0.70 max | Residual element, kept low to maintain alloy integrity. | | **Boron (B)** | 0.005 max | Strengthens grain boundaries to improve creep life. | | **Zirconium (Zr)** | 0.06 max | Trace addition to enhance creep rupture 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 Coefficient of Thermal Expansion** | 12.6 x 10⁻⁶/°C (20 - 100°C) | | | 16.8 x 10⁻⁶/°C (20 - 800°C) | | **Electrical Resistivity** | 1.25 μΩ·m @ 20°C | | **Modulus of Elasticity** | 211 GPa (30.6 x 10⁶ psi) @ 20°C | --- #### **3. Key Characteristics & Mechanical Properties for Forgings** Forgings are typically supplied in a solution-annealed or solution-annealed and aged condition, offering superior properties compared to cast or fabricated alternatives. * **Superior Structural Integrity:** The forging process eliminates porosity, refines grain size, and improves fatigue life. * **Enhanced Directional Strength:** Die forgings can be oriented to align the grain flow with the primary direction of stress. * **High-Temperature Capability:** Excellent creep and rupture strength at temperatures up to 800°C (1470°F). * **Outstanding Oxidation Resistance:** The high Chromium content provides a protective oxide scale for prolonged service life. * **Good Machinability:** Can be machined using conventional techniques, though it requires rigid setups and positive cutting tools. **Typical Room-Temperature Mechanical Properties (Precipitation-Hardened Forgings)** * **Tensile Strength:** 1000 - 1250 MPa (145 - 180 ksi) * **Yield Strength (0.2% Offset):** 600 - 850 MPa (87 - 123 ksi) * **Elongation:** 20 - 30% --- #### **4. Product Applications for Forgings** Alloy 263 forgings are specified for the most critically stressed components in high-temperature environments. * **Aerospace & Gas Turbine Engines:** * **Turbine Disks (Blisks and Rotors)** * **Compressor Casings and Shafts** * **Combustion Chamber Mounting Components** * **Turbine Spacers and Rings** * **Nozzle Actuator Levers and Links** * **Power Generation:** * **Gas Turbine Rotor Components** * **High-Temperature Bolting and Fasteners** * **Industrial and Marine Turbines:** * **Critical rotating and structural parts** requiring high reliability. --- #### **5. International Standards** Alloy 263 forgings are produced to meet stringent international material and quality specifications. | Standard Type | Standard Number | Title / Specification (Examples) | | :--- | :--- | :--- | | **Unified Numbering System (UNS)** | **N07263** | All product forms | | **Aerospace (SAE/AMS)** | **AMS 5872** | *Bars, Forgings, and Rings; Solution Heat Treated, Precipitation-Hardenable* (The primary specification for forgings) | | **ASTM International** | **ASTM B564** | Standard Specification for Nickel Alloy Forgings | | **European (EN)** | **EN 10253** | Butt-welding pipe fittings | | | **2.4650** | Material Number (Werkstoff Nr.) | | **Procurement Specifications** | **GE S-400** | (Example of an OEM-specific specification) | | | **Pratt & Whitney PWA 1104** | (Example of an OEM-specific specification) | --- **Summary** **Alloy 263 Forgings (Haynes 263, UNS N07263)** represent the premium product form for components demanding the highest levels of strength, reliability, and metallurgical soundness. The forging process imparts a uniform, refined microstructure that is essential for withstanding the extreme centrifugal, thermal, and vibratory stresses encountered in jet engine and power turbine cores. Their proven performance under the most severe conditions, governed by strict international standards like AMS 5872, makes them a fundamental material for advanced engineering in the aerospace and energy sectors.

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 2127 gallon liquid totes Special package is available on request.