Alloy 263,Haynes 263,UNS N07263,E FORU

### **Alloy 263 / Haynes® 263 / UNS N07263** **Precipitation-Hardenable Nickel-Based Superalloy for High-Temperature Applications** #### **1. Overview** **Alloy 263**, commercially known as **Haynes® 263**, is a precipitation-hardenable nickel-based superalloy designed to provide an excellent combination of high-temperature strength, thermal stability, and fabricability. This alloy is particularly noted for its superior creep resistance and good oxidation resistance at temperatures up to 980°C (1800°F). Haynes 263 offers excellent formability and weldability compared to many other precipitation-hardening superalloys, making it ideal for sheet metal applications in gas turbine engines and other high-temperature components. #### **2. Chemical Composition (Weight %)** The typical chemical composition of Haynes 263 is outlined below. The balance is Nickel (Ni). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the austenitic matrix and provides fundamental high-temperature strength and stability. | | **Chromium (Cr)** | 19.0 - 21.0 | Provides excellent oxidation and hot corrosion resistance. | | **Cobalt (Co)** | 19.0 - 21.0 | Enhances solid-solution strengthening and elevates γ' solvus temperature. | | **Molybdenum (Mo)** | 5.6 - 6.1 | Provides substantial solid-solution strengthening and enhances creep strength. | | **Titanium (Ti)** | 1.9 - 2.4 | Primary precipitation hardening element forming γ' phase (Ni₃Ti). | | **Aluminum (Al)** | 0.3 - 0.6 | Co-precipitates with titanium to form γ' phase (Ni₃(Al,Ti)). | | **Carbon (C)** | 0.04 - 0.08 | Forms carbides for grain boundary strengthening and stability. | | **Boron (B)** | 0.005 max | Enhances creep strength and grain boundary cohesion. | | **Copper (Cu)** | 0.20 max | Controlled impurity. | | **Iron (Fe)** | 0.70 max | Controlled impurity; kept low to maintain optimal high-temperature properties. | | **Manganese (Mn)** | 0.60 max | Improves hot workability and manufacturability. | | **Silicon (Si)** | 0.40 max | Enhances oxidation resistance through protective scale formation. | | **Sulfur (S)** | 0.007 max | Impurity, kept very low to prevent hot shortness and embrittlement. | #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.36 g/cm³ (0.302 lb/in³) | | **Melting Range** | ~ 1330 - 1380 °C (2426 - 2516 °F) | | **Mean Coefficient of Thermal Expansion** | 20 - 500°C (68 - 932°F): **14.4 x 10⁻⁶/°C** (8.0 x 10⁻⁶/°F)
20 - 800°C (68 - 1472°F): **15.8 x 10⁻⁶/°C** (8.8 x 10⁻⁶/°F) | | **Thermal Conductivity** | 17.2 W/m·K (119 Btu·in/hr·ft²·°F) at 20°C (68°F)
26.0 W/m·K (180 Btu·in/hr·ft²·°F) at 800°C (1472°F) | | **Specific Heat** | 440 J/kg·K (0.105 Btu/lb·°F) at 20°C (68°F) | | **Electrical Resistivity** | 1.20 μΩ·m at 20°C (68°F) | | **Modulus of Elasticity (Young's Modulus)** | 220 GPa (31.9 x 10⁶ psi) at 20°C (68°F) | | **Magnetic Permeability** | Essentially non-magnetic in all conditions. | #### **4. Mechanical Properties (Typical for Aged Condition)** | Property | At Room Temperature | At 750°C (1382°F) | At 850°C (1562°F) | | :--- | :--- | :--- | :--- | | **Tensile Strength** | 950 - 1150 MPa (138 - 167 ksi) | ~580 MPa (84 ksi) | ~380 MPa (55 ksi) | | **Yield Strength (0.2% Offset)** | 550 - 750 MPa (80 - 109 ksi) | ~480 MPa (70 ksi) | ~320 MPa (46 ksi) | | **Elongation (in 50 mm / 2 in)** | 25% - 35% | 20% - 30% | 25% - 40% | | **Hardness (Rockwell C)** | 25 - 32 HRC | - | - | #### **5. International Standards** Haynes 263 is covered by several international and industry-specific standards: * **ASTM:** * **B 637:** Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service * **AMS:** * **AMS 5872:** Sheet, Strip, and Plate * **AMS 5706:** Bar and Forging Stock * **BS / EN:** * **BS HR 5012:** Aerospace series * **EN 10095:** Heat resisting steels and nickel alloys * **UNS:** N07263 * **DIN:** 2.4650 (Material Number) * **ISO:** ISO 9723, ISO 9724 * **AECMA:** PR EN 2631 #### **6. Product Applications** Haynes 263 is extensively used in high-temperature applications requiring both strength and fabricability: * **Aerospace & Gas Turbines:** * Combustion chambers and liners * Afterburner components * Turbine seals and shrouds * Exhaust system components * Transition ducts * **Industrial Gas Turbines:** * Combustion cans * Hot gas path components * Turbine blades and vanes * **Power Generation:** * Gas turbine components * High-temperature fasteners and hardware * **Automotive & Marine:** * High-performance turbocharger components * Exhaust valves and systems #### **7. Key Characteristics & Advantages** * **Excellent High-Temperature Strength:** Maintains mechanical properties at temperatures up to 980°C (1800°F) * **Superior Fabricability:** Excellent formability and weldability compared to many precipitation-hardening superalloys * **Outstanding Creep Resistance:** Excellent performance under sustained loading at elevated temperatures * **Good Oxidation Resistance:** Resists oxidation and hot corrosion in demanding environments * **Thermal Fatigue Resistance:** Withstands thermal cycling and thermal shock conditions * **Stable Microstructure:** Maintains γ' precipitation strengthening during long-term exposure * **Versatile Application Range:** Suitable for both static and rotating components in high-temperature service --- **Disclaimer:** *Haynes® 263 is a registered trademark of Haynes International, Inc. The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier and relevant design codes.*

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 1660 gallon liquid totes Special package is available on request.