AL 276™ Nickel-Base Alloy, UNS N10276,DIN 2.4819; 1

### **Product Datasheet: AL-276™ / HASTELLOY® C-276 (UNS N10276)** **A Nickel-Chromium-Molybdenum-Tungsten Alloy for Extreme Corrosion Resistance** --- #### **1. Overview** **AL-276™**, commercially known as **HASTELLOY® C-276**, is a nickel-chromium-molybdenum-tungsten alloy renowned for its exceptional corrosion resistance in severely aggressive environments. As a member of the C-type family, it features outstanding resistance to both oxidizing and reducing media, with particular effectiveness against chloride-induced stress corrosion cracking and pitting. The alloy's optimized chemical composition, characterized by low carbon and silicon content, provides superior thermal stability and excellent weldability without requiring post-weld heat treatment. This makes it a premier choice for critical applications across chemical processing, pollution control, and oil and gas industries where reliability in harsh conditions is paramount. --- #### **2. Chemical Composition (Typical Weight %)** | Element | Content (%) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance (~57) | Forms the corrosion-resistant austenitic matrix | | **Chromium (Cr)** | ~14.5 - 16.5 | Provides resistance to oxidizing environments | | **Molybdenum (Mo)** | ~15.0 - 17.0 | Enhances resistance to reducing acids and localized corrosion | | **Tungsten (W)** | ~3.0 - 4.5 | Improves resistance to reducing acids | | **Iron (Fe)** | ~4.0 - 7.0 | Controlled residual element | | **Cobalt (Co)** | ≤ 2.5 | Residual element | | **Vanadium (V)** | ≤ 0.35 | Residual element | | **Carbon (C)** | ≤ 0.01 | Minimizes carbide precipitation | | **Manganese (Mn)** | ≤ 1.00 | Residual element | | **Silicon (Si)** | ≤ 0.08 | Kept low to prevent detrimental phase formation | --- #### **3. Physical Properties (Typical)** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.89 g/cm³ (0.321 lb/in³) | | **Melting Range** | 1325-1370 °C (2417-2498 °F) | | **Thermal Expansion Coefficient** | 11.2 μm/m·°C (20-100°C) | | **Thermal Conductivity** | 10.8 W/m·K (at 100°C) | | **Modulus of Elasticity** | 205 GPa (29.7×10⁶ psi) | | **Electrical Resistivity** | 1.30 μΩ·m | --- #### **4. Mechanical Properties (Annealed Condition)** **Room Temperature:** * **Tensile Strength**: ≥ 690 MPa (100 ksi) * **Yield Strength**: ≥ 283 MPa (41 ksi) * **Elongation**: ≥ 40% **Elevated Temperature Performance:** Maintains excellent mechanical properties and corrosion resistance up to approximately 1090°C (2000°F) --- #### **5. Corrosion Resistance** AL-276 demonstrates exceptional performance in diverse corrosive environments: * **Localized Corrosion**: Outstanding resistance to pitting and crevice corrosion in chloride solutions * **Oxidizing Media**: Effective against nitric acid, ferric chloride, and other oxidizing salts * **Reducing Conditions**: Excellent performance in sulfuric and hydrochloric acids * **Mixed Environments**: Handles complex chemical mixtures and phase transitions * **Stress Corrosion Cracking**: Highly resistant to chloride-induced SCC --- #### **6. Product Applications** **Chemical Processing Industry:** * Reactors, vessels, and heat exchangers * Piping systems for aggressive chemical transport **Pollution Control:** * Flue Gas Desulfurization (FGD) systems * Scrubbers and ducting components **Oil and Gas:** * Downhole components in sour service * Process equipment in refineries **Other Applications:** * Pharmaceutical processing equipment * Waste treatment systems * Pulp and paper manufacturing --- #### **7. International Standards** * **UNS**: N10276 * **DIN/Werkstoff Nr.**: 2.4819 * **Primary Specifications**: * **ASTM B-575 / ASME SB-575**: Plate, Sheet, and Strip * **ASTM B574**: Bar and Rod * **ASTM B619**: Welded Pipe * **ASTM B622**: Seamless Pipe and Tube * **Additional Certifications**: * ASME Boiler and Pressure Vessel Code * ISO 15156-3 (NACE MR0175) for sour service * Various European and international pressure equipment directives --- **Technical Note:** The information provided represents typical values and characteristics. Actual properties may vary based on manufacturing processes, heat treatment, and specific product form. For critical applications, consult the most recent edition of relevant material specifications and manufacturer's technical data. *HASTELLOY is a registered trademark of Haynes International. AL-276 is understood to be a related trademark for this alloy composition.*

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 3378 gallon liquid totes Special package is available on request.