Alloy C276,Inconel C276,UNS N10276,E FORU

### **Alloy C-276 / Hastelloy® C-276 / UNS N10276** #### **A Nickel-Chromium-Molybdenum Tungsten Alloy with Exceptional Corrosion Resistance** **Overview** Alloy C-276 is a versatile nickel-chromium-molybdenum alloy known as **Hastelloy® C-276**. It is renowned for its exceptional corrosion resistance in a wide range of severe environments, including oxidizing and reducing media. Its key characteristic is outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. The low carbon content minimizes carbide precipitation during welding, making it suitable for most chemical process applications in the as-welded condition. It is often the material of choice for handling the most aggressive corrosives across various industries. --- ### **Chemical Composition (Weight %)** The typical chemical composition of Alloy C-276 is outlined below. The balance is Nickel (Ni). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Provides inherent corrosion resistance and a stable austenitic matrix. | | **Chromium (Cr)** | 14.5 - 16.5 | Confers resistance to oxidizing media (e.g., salts, nitric acid). | | **Molybdenum (Mo)** | 15.0 - 17.0 | Provides resistance to reducing acids (e.g., hydrochloric, sulfuric) and to pitting/crevice corrosion. | | **Tungsten (W)** | 3.0 - 4.5 | Enhances resistance to reducing acids and complements molybdenum. | | **Iron (Fe)** | 4.0 - 7.0 | Balances cost and fabricability; controlled to maintain corrosion resistance. | | **Cobalt (Co)** | 2.5 max | - | | **Vanadium (V)** | 0.35 max | - | | **Manganese (Mn)** | 1.0 max | - | | **Silicon (Si)** | 0.08 max | - | | **Carbon (C)** | 0.01 max | Kept very low to prevent sensitization and intergranular corrosion. | | **Phosphorus (P)** | 0.025 max | - | | **Sulfur (S)** | 0.01 max | - | *Note: The "L" grade (low carbon and silicon) is integral to its design, ensuring optimal performance in the welded condition.* --- ### **Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.89 g/cm³ (0.321 lb/in³) | | **Melting Range** | ~ 1325 - 1370 °C (2420 - 2500 °F) | | **Mean Coefficient of Thermal Expansion** | 20 - 200°C (68 - 392°F): **11.2 x 10⁻⁶/°C** (6.2 x 10⁻⁶/°F)
20 - 400°C (68 - 752°F): **11.9 x 10⁻⁶/°C** (6.6 x 10⁻⁶/°F) | | **Thermal Conductivity** | 11.1 W/m·K (77 Btu·in/hr·ft²·°F) at 100°C (212°F) | | **Specific Heat** | 427 J/kg·K (0.102 Btu/lb·°F) at 100°C (212°F) | | **Electrical Resistivity** | 1.30 μΩ·m at 21°C (70°F) | | **Modulus of Elasticity (Young's Modulus)** | 205 GPa (29.8 x 10⁶ psi) at 21°C (70°F) | | **Magnetic Permeability** | Typically < 1.001 (Essentially non-magnetic). | --- ### **Mechanical Properties (Typical for Annealed Condition)** | Property | At Room Temperature | At 315°C (600°F) | | :--- | :--- | :--- | | **Tensile Strength** | 790 MPa (115 ksi) min | 655 MPa (95 ksi) | | **Yield Strength (0.2% Offset)** | 345 MPa (50 ksi) min | 295 MPa (43 ksi) | | **Elongation (in 50 mm / 2 in)** | 40% min | 40% | | **Hardness (Rockwell B)** | 85 - 95 HRB | - | --- ### **International Standards** Alloy C-276 is covered by numerous international standards for various product forms: * **ASTM:** * **B 575:** Standard Specification for Low-Carbon Nickel-Chromium-Molybdenum, Nickel-Molybdenum-Chromium, Nickel-Molybdenum-Columbium, and Nickel-Chromium-Molybdenum-Tungsten Alloy Plate, Sheet, and Strip. * **B 574:** Standard Specification for Low-Carbon Nickel-Chromium-Molybdenum, Low-Carbon Nickel-Molybdenum-Chromium, Low-Carbon Nickel-Molybdenum-Columbium, and Low-Carbon Nickel-Chromium-Molybdenum-Tungsten Alloy Rod. * **B 622:** Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube. * **B 619/B 626:** Standard Specification for Welded Pipe and Tube. * **ASME:** SB-575, SB-574, etc. (Approved for use in ASME Boiler and Pressure Vessel Code, Section VIII). * **UNS:** N10276 * **EN (European Standard):** 2.4819 (Material Number) * **DIN:** DIN 17744, DIN 17752 (Werkstoff Nr. 2.4819) --- ### **Product Applications** Alloy C-276 is a workhorse material in industries where corrosion is a primary failure mechanism: 1. **Chemical Processing Industry (CPI):** * **Reactors, Vessels, and Columns:** For production of acids, pharmaceuticals, and agrochemicals. * **Heat Exchangers:** Handling corrosive cooling media and process streams. * **Piping Systems, Valves, and Pumps:** For transporting chlorides, sulfuric acid, hydrochloric acid, and other aggressive chemicals. 2. **Pollution Control:** * **Flue Gas Desulfurization (FGD) Systems:** Critical components like absorber towers, outlet ducts, and stack liners exposed to wet sulfuric acid and chlorides. 3. **Pulp and Paper Industry:** * **Digesters, Bleach Plants:** Equipment exposed to corrosive chlorine dioxide and chloride-containing liquors. 4. **Waste Incineration:** * **Components** handling harsh flue gases and acidic condensates. 5. **Pharmaceutical Industry:** * **Process Equipment** requiring high purity and resistance to cleaning agents and process streams. 6. **Marine and Offshore:** * **Seawater Systems:** Pumps, valves, and heat exchangers where resistance to pitting and crevice corrosion in seawater is critical. --- ### **Key Characteristics & Advantages** * **Exceptional Versatility:** Resists a wider range of corrosives than most other alloys, including wet chlorine, hypochlorite, and chlorine dioxide. * **Outstanding Localized Corrosion Resistance:** Excellent resistance to pitting and crevice corrosion, crucial for chloride-containing environments. * **Excellent Welding Performance:** The low carbon content minimizes the precipitation of carbides in the heat-affected zone (HAZ), allowing it to be used in the as-welded condition without post-weld heat treatment for most applications. * **High Strength and Toughness:** Maintains good mechanical properties over a wide temperature range. **Disclaimer:** *Hastelloy® C-276 is a registered trademark of Haynes International. 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 1652 gallon liquid totes Special package is available on request.