Altemp 263 Nickel-Based alloy,UNS N07263，1

### **Product Datasheet: Altemp 263 (UNS N07263)** **A Precipitation-Hardenable Nickel-Based Alloy Optimized for High Strength and Fabricability** --- #### **1. Overview** **Altemp 263** (commonly known as **Alloy 263**) is a precipitation-hardenable nickel-cobalt-chromium alloy specifically designed to offer an excellent combination of **high strength, good fatigue resistance, and outstanding fabricability**. Its key advantage lies in its superior **formability and weldability** in the solution-annealed condition compared to many other high-strength superalloys. Once aged, it develops high tensile and creep-rupture strength, making it particularly suitable for sheet metal components operating at temperatures up to **800°C (1470°F)**. It also possesses good oxidation resistance due to its high chromium content. #### **2. Chemical Composition (Typical Weight %)** The composition is balanced for strength, stability, and workability. | Element | Content (%) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance (~47-53) | Forms the austenitic matrix. | | **Chromium (Cr)** | ~19.0 - 21.0 | Provides excellent oxidation resistance. | | **Cobalt (Co)** | ~19.0 - 21.0 | Solid solution strengthener and stabilizer. | | **Molybdenum (Mo)** | ~5.6 - 6.1 | Potent solid solution strengthener. | | **Titanium (Ti)** | ~1.9 - 2.4 | Forms the primary strengthening γ' phase (Ni₃(Al,Ti)). | | **Aluminum (Al)** | ~0.3 - 0.6 | Contributes to γ' formation and oxidation resistance. | | **Carbon (C)** | ≤ 0.06 | Forms carbides for grain boundary strength. | | **Boron (B)** | ≤ 0.005 | Enhances creep life. | | **Manganese (Mn)** | ≤ 0.60 | Residual element. | | **Silicon (Si)** | ≤ 0.40 | Residual element. | | **Iron (Fe)** | ≤ 0.70 | Residual element. | #### **3. Physical Properties (Typical)** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.36 g/cm³ (0.302 lb/in³) | | **Melting Range** | ~1330 - 1380 °C (~2430 - 2515 °F) | | **Thermal Expansion Coefficient** | ~14.2 μm/m·°C (20 - 540°C) | | **Thermal Conductivity** | ~12.5 W/m·K (at 100°C) | | **Modulus of Elasticity** | ~211 GPa (30.6 x 10⁶ psi) at 20°C | #### **4. Mechanical Properties** Properties are developed through a solution treatment and a single aging step. **At Room Temperature (Solution Treated & Aged):** * **Tensile Strength:** > 1000 MPa (145 ksi) * **Yield Strength (0.2% Offset):** > 600 MPa (87 ksi) * **Elongation:** > 25% **At Elevated Temperature (e.g., 750°C / 1380°F):** * **Tensile Strength:** ~580 MPa (84 ksi) * **Yield Strength (0.2% Offset):** ~500 MPa (73 ksi) * **Creep-Rupture Strength:** Excellent for sheet metal applications at intermediate temperatures. #### **5. Heat Treatment** A standard heat treatment cycle for Alloy 263 is straightforward: 1. **Solution Treatment:** Heat to **1150°C (2100°F)**, hold, then rapidly cool (water quench or fast air cool). This produces a soft, ductile condition ideal for forming and welding. 2. **Aging / Precipitation Hardening:** Heat to **800°C (1470°F)** for 8 hours, then air cool. This precipitates the γ' phase, developing high strength. #### **6. Product Applications** Alloy 263 is widely used in the aerospace and power generation industries for combustion and high-temperature sheet metal components: * **Aerospace:** Combustion chamber liners, casings, afterburner components, and exhaust ducting. * **Industrial Gas Turbines (IGT):** Transition ducts, liners, and other hot gas path components. * **Sheet Metal Fabrications:** Any complex component requiring high strength after forming and welding. #### **7. International and Industry Standards** Alloy 263 is covered by a range of international and proprietary specifications. * **UNS:** **N07263** * **Werkstoff Nr.:** **2.4650** * **AMS (Aerospace Material Specification):** * **AMS 5872:** Sheet, Strip, and Plate (Solution Heat Treated and Stabilized) * **AMS 5873:** Sheet, Strip, and Plate (Solution Heat Treated and Precipitation Treated) * **ASTM:** B906 (Standard Specification for General Requirements for Flat-Rolled Nickel and Cobalt Alloys Plate, Sheet, and Strip) --- **Disclaimer:** The information provided is typical and for reference purposes only. Mechanical properties are dependent on product form and heat treatment. For design and procurement, the applicable material specification (e.g., AMS 5873) and the manufacturer's technical data must be consulted. "Altemp" is a trademark associated with high-temperature alloys.

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 3369 gallon liquid totes Special package is available on request.