Alloy 263,Haynes 263 Sheet,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

### **Alloy 263 / Haynes 263 / UNS N07263 - Product Introduction** **Overview** Alloy 263 (commonly known as Haynes 263 and standardized as UNS N07263) is a nickel-cobalt-chromium superalloy renowned for its exceptional combination of high strength, excellent fabricability, and outstanding oxidation resistance at elevated temperatures. It is a precipitation-hardenable alloy, meaning its superior mechanical properties are achieved through a specific heat treatment process. Originally developed for gas turbine engine components, Alloy 263 offers a superior balance of creep strength (resistance to deformation under load at high temperatures) and thermal stability compared to many other wrought nickel-based alloys. Its excellent formability and weldability in the solution-treated condition make it a preferred choice for complex sheet metal fabrications. --- #### **1. Chemical Composition** The high-performance characteristics of Alloy 263 are derived from its carefully balanced chemical composition. | 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. | | **Molybdenum (Mo)** | 5.6 - 6.1 | Provides solid solution strengthening and resistance to creep. | | **Titanium (Ti)** | 1.9 - 2.4 | Primary precipitation hardener (forms γ' phase, Ni₃Ti). | | **Aluminum (Al)** | 0.3 - 0.6 | Secondary precipitation hardener (forms γ' phase, Ni₃Al). | | **Carbon (C)** | 0.04 - 0.08 | Improves strength through carbide formation. | | **Manganese (Mn)** | 0.60 max | Controls sulfur content and aids in manufacturability. | | **Silicon (Si)** | 0.40 max | Improves oxidation resistance. | | **Iron (Fe)** | 0.70 max | Residual element, kept low to maintain performance. | | **Copper (Cu)** | 0.20 max | Residual element, kept low to prevent hot cracking. | | **Boron (B)** | 0.005 max | Enhances creep strength by strengthening grain boundaries. | | **Zirconium (Zr)** | 0.06 max | Trace element added to improve creep properties. | | **Sulfur (S)** | 0.007 max | Impurity, kept very 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** | 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 (7.0 x 10⁻⁶/°F) | 20 - 100°C | | | 16.8 x 10⁻⁶/°C (9.3 x 10⁻⁶/°F) | 20 - 800°C | | **Electrical Resistivity** | 1.25 μΩ·m @ 20°C | | **Modulus of Elasticity (Young's Modulus)** | 211 GPa (30.6 x 10⁶ psi) @ 20°C | | | 159 GPa (23.1 x 10⁶ psi) @ 650°C | --- #### **3. Mechanical Properties (Typical for Sheet Product)** Properties are typically reported in the solution-annealed and precipitation-hardened condition. **Room Temperature Properties (After Full Heat Treatment):** * **Tensile Strength:** 950 - 1200 MPa (138 - 174 ksi) * **Yield Strength (0.2% Offset):** 550 - 800 MPa (80 - 116 ksi) * **Elongation:** 20 - 30% **Elevated Temperature Strength (Approximate):** * **Creep Rupture Strength (1000 hours):** * **650°C (1200°F):** ~ 270 MPa (~39 ksi) * **760°C (1400°F):** ~ 100 MPa (~14.5 ksi) --- #### **4. Product Applications** Alloy 263 is primarily used in aerospace, industrial gas turbine, and other high-temperature engineering applications. Key components include: * **Aerospace & Gas Turbine Engines:** * Combustion liners and chambers * Turbine casings and shrouds * Afterburner components * Exhaust ducts and plug nozzles * Hot section sheet metal fabrications * **Power Generation:** * Components for land-based gas turbines * **Other High-Temperature Applications:** * Heat treatment fixtures and baskets * Rocket engine components --- #### **5. International Standards** Alloy 263 is covered by a range of international material and specification standards. | Standard Type | Standard Number | Specification / Form | | :--- | :--- | :--- | | **Unified Numbering System (UNS)** | **N07263** | All product forms | | **ASTM (International)** | ASTM B906 | Standard Specification for Sheet/Strip (General) | | | ASTM B168 | Standard Specification for Plate, Sheet, and Strip | | **Aerospace (SAE/AMS)** | AMS 5872 | Bars, Forgings, and Rings | | | AMS 5876 | Sheet, Strip, and Plate (Solution Annealed) | | **European (EN)** | EN 10302 | Creep resisting steel, nickel and cobalt alloys | | | 2.4650 | Material Number (Werkstoff Nr.) | | **British (BS)** | BS HR 203 | Sheet and Plate | | **Aerospace (Pratt & Whitney)** | PWA 1104 | - | --- **Summary** In conclusion, **Alloy 263 (Haynes 263, UNS N07263)** is a premier nickel-cobalt superalloy specifically engineered for high-strength applications in the 650°C to 900°C (1200°F to 1650°F) range. Its optimal blend of precipitation hardening capability, superior oxidation resistance, and excellent formability makes it an indispensable material for critical components in the most demanding aerospace and industrial environments. Its compliance with major international standards ensures its consistent quality and global acceptance.

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 2124 gallon liquid totes Special package is available on request.