INCONEL Alloy C-276,Nickel-Chromium Alloy; UNS N10276; ，1

### **Product Introduction: INCONEL® Alloy C-276 (UNS N10276)** **INCONEL® Alloy C-276** is a premier, versatile nickel-chromium-molybdenum alloy renowned for its exceptional corrosion resistance in a wide range of severe environments. It is a member of the C-family of alloys, specifically designed to handle both oxidizing and reducing media. Its key advantage lies in its very low carbon and silicon content, which minimizes the precipitation of carbide and intermetallic phases in the heat-affected zone (HAZ) during welding, thereby maintaining excellent corrosion resistance in the as-welded condition. This alloy exhibits outstanding resistance to pitting, crevice corrosion, and stress-corrosion cracking. It is particularly effective in handling wet chlorine, mixed acids, and other aggressive chemical species, making it a cornerstone material for the chemical processing, pollution control, and pulp and paper industries. --- ### **International Standards & Material Equivalents** INCONEL Alloy C-276 is standardized across all major international specifications. | Standard Type | Standard Number | Title / Product Form | | :--- | :--- | :--- | | **UNS (USA)** | **N10276** | **INCONEL Alloy C-276** | | **ASTM** | B575 | Plate, Sheet, and Strip | | **ASTM** | B574 | Rod and Bar (Low-Carbon) | | **ASTM** | B622 | Seamless Pipe and Tube | | **ASTM** | B619, B626 | Welded Pipe and Tube | | **ASME** | SB-575, SB-574, etc. | Pressure Vessel Code Editions | | **DIN (Germany)** | 17744 | NiMo16Cr15W | | **Werkstoff Nr.** | **2.4819** | **2.4819** | | **EN (Europe)** | EN 10095 | NiMo16Cr15W | > **Note:** INCONEL® is a registered trademark of Special Metals Corporation. The primary identifier is **UNS N10276**. --- ### **Chemical Composition** The composition is precisely balanced to provide a robust passive film and resist a broad spectrum of corrodents. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 14.5 - 16.5 | | **Molybdenum (Mo)** | 15.0 - 17.0 | | **Tungsten (W)** | 3.0 - 4.5 | | **Iron (Fe)** | 4.0 - 7.0 | | **Cobalt (Co)** | 2.5 max. | | **Vanadium (V)** | 0.35 max. | | **Carbon (C)** | 0.01 max. | | **Manganese (Mn)** | 1.0 max. | | **Silicon (Si)** | 0.08 max. | | **Phosphorus (P)** | 0.025 max. | | **Sulfur (S)** | 0.01 max. | --- ### **Physical Properties** Alloy C-276 possesses physical properties suitable for fabricating process equipment for corrosive service. | Property | Value | | :--- | :--- | | **Density** | 8.89 g/cm³ (0.321 lb/in³) | | **Melting Point** | 1323 - 1371 °C (2413 - 2500 °F) | | **Thermal Conductivity** | 10.2 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.30 μΩ·m (at 20°C) | | **Modulus of Elasticity** | 205 GPa (29.7 x 10⁶ psi) | | **Coefficient of Thermal Expansion** | 11.2 μm/m·°C (20-100°C) | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties (Typical for Annealed Condition)** The alloy offers a good balance of strength and ductility for fabrication and service. | Property | Value (Room Temperature, Annealed) | | :--- | :--- | | **Tensile Strength** | 790 MPa (115 ksi) | | **Yield Strength (0.2% Offset)** | 415 MPa (60 ksi) | | **Elongation** | 55% | | **Hardness (Rockwell B)** | 90 HRB | --- ### **Key Characteristics & Advantages** 1. **Exceptional Versatility in Corrosive Environments:** Resists a vast array of chemicals, including sulfuric, hydrochloric, and phosphoric acids, chlorine and chloride-containing media, and solvents. 2. **Superior Resistance to Localized Attack:** Offers excellent resistance to pitting and crevice corrosion, driven by its high molybdenum and chromium content. 3. **Excellent Weldability with Low HAZ Sensitivity:** Its low carbon and silicon content means it can be welded in most environments without significant loss of corrosion resistance in the weld area, a significant advantage over many other high-performance alloys. 4. **Outstanding Performance in Oxidizing and Reducing Conditions:** The balanced composition allows it to perform well where other alloys may fail, such as in environments containing both acids and oxidizers. 5. **Resistance to Stress-Corrosion Cracking (SCC):** Highly resistant to chloride-induced stress-corrosion cracking. --- ### **Product Applications** INCONEL Alloy C-276 is a workhorse material in industries where corrosion failure is not an option. * **Chemical Processing:** * **Reactors, columns, and heat exchangers.** * Piping systems, valves, and pumps for aggressive chemical production. * Equipment for acetic acid, maleic anhydride, and terephthalic acid production. * **Pollution Control:** * **Flue gas desulfurization (FGD) system components:** scrubbers, fans, ducts, and stack liners. * Waste incineration and acid recovery plants. * **Pulp and Paper Industry:** * Digesters, bleach plants, and stock handling systems. * **Pharmaceutical and Agrochemical:** * Process vessels and piping requiring high purity and corrosion resistance. * **Oil & Gas:** * Downhole and surface equipment for sour (H₂S-containing) service. ### **Summary** **INCONEL Alloy C-276 (UNS N10276)** is a benchmark nickel-chromium-molybdenum alloy that sets the standard for corrosion resistance in the most challenging industrial environments. Its unique combination of **versatile corrosion resistance, excellent weldability, and outstanding resistance to localized attack** makes it a first-choice material for critical equipment in chemical processing, pollution control, and beyond. Governed by standards like **ASTM B575** and **B574**, it provides unparalleled reliability and long service life, ensuring safety and operational continuity where corrosion is a constant threat.

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 3307 gallon liquid totes Special package is available on request.