Nickelvac HC-276 Nickel Superalloy,UNS N10276; ASTM B 574, B 622, C276,E FORU

### **Product Introduction: Nickelvac® HC-276 (UNS N10276) Nickel-Based Superalloy** **Nickelvac HC-276** (commonly known as Hastelloy C-276) is a versatile, nickel-molybdenum-chromium superalloy renowned for its exceptional corrosion resistance in a wide range of severe environments. It is a member of the C-family of alloys but is distinguished by its very low carbon and silicon content, which minimizes the formation of carbide precipitates in the heat-affected zone (HAZ) during welding. This characteristic makes it highly resistant to weld decay, allowing it to be used in the as-welded condition for most applications. The alloy exhibits outstanding resistance to pitting, stress corrosion cracking, and oxidizing atmospheres up to 1900°F (1038°C). Its ability to withstand both reducing and oxidizing chemicals makes it one of the most widely used corrosion-resistant materials in the chemical processing industry. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of Nickelvac HC-276 per ASTM B574 and other relevant specifications is as follows: | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | **Iron (Fe)** | 4.00 - 7.00 | | **Molybdenum (Mo)** | 15.00 - 17.00 | **Manganese (Mn)** | ≤ 1.00 | | **Chromium (Cr)** | 14.50 - 16.50 | **Silicon (Si)** | ≤ 0.08 | | **Tungsten (W)** | 3.00 - 4.50 | **Carbon (C)** | ≤ 0.01 | | **Cobalt (Co)** | ≤ 2.50 | **Sulfur (S)** | ≤ 0.03 | | **Vanadium (V)** | ≤ 0.35 | **Phosphorus (P)** | ≤ 0.04 | **Key Metallurgical Feature:** HC-276 is a solid-solution strengthened, single-phase alloy with a face-centered cubic (FCC) structure. The low carbon and silicon levels are critical for its superior performance in the welded condition. --- #### **2. Physical Properties** Typical physical properties for Nickelvac HC-276 alloy are provided below. | Property | Metric Units | Imperial Units | | :--- | :--- | :--- | | **Density** | 8.89 g/cm³ | 0.321 lb/in³ | | **Melting Range** | ~1325 - 1370 °C | ~2415 - 2500 °F | | **Specific Heat (20°C)** | 427 J/kg·K | 0.102 Btu/lb·°F | | **Thermal Conductivity (20°C)** | 10.2 W/m·K | 70.7 Btu·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion (20-100°C)** | 11.2 μm/m·°C | 6.2 μin/in·°F | | **Modulus of Elasticity (Tensile)** | 205 GPa | 29.7 x 10⁶ psi | | **Electrical Resistivity** | 1.30 μΩ·m | - | --- #### **3. Mechanical Properties (Typical for ASTM B574 - Bar)** Mechanical properties are typically given for material in the solution annealed condition. **Standard Condition:** Solution Annealed and Rapidly Quenched **Typical Room Temperature Mechanical Properties:** | Property | Value (Typical) | | :--- | :--- | | **Tensile Strength** | 690 MPa (100 ksi) min | | **Yield Strength (0.2% Offset)** | 283 MPa (41 ksi) min | | **Elongation** | 40% min | *Note: These are typical minimum values per ASTM standards; actual properties can vary with product form.* --- #### **4. International Standards & Specifications** Nickelvac HC-276 is one of the most standardized and globally accepted corrosion-resistant alloys. **Primary Material Specifications (ASTM International):** * **ASTM B574:** Standard Specification for Low-Carbon Nickel-Molybdenum-Chromium, Nickel-Molybdenum-Chromium-Tantalum, and Low-Carbon Nickel-Chromium-Molybdenum-Tungsten Alloy Rod. * **ASTM B622:** Standard Specification for Seamless Nickel and Nickel Alloy Pipe and Tube. * **ASTM B575:** Standard Specification for Low-Carbon Nickel-Molybdenum-Chromium, Nickel-Molybdenum-Chromium-Tantalum, and Low-Carbon Nickel-Chromium-Molybdenum-Tungsten Alloy Sheet, Strip, and Plate. (Often referenced as "C276" in general terms). **Other Key Standards:** * **UNS:** N10276 * **ASME:** SB-574, SB-622, SB-575 (For pressure vessel and component construction) * **AMS:** 5754 (Bars, Forgings, and Rings) * **ISO:** 15156-3 / MR0175 (For sour service in oil & gas) * **EN (European Norm):** 2.4819 * **Welding Consumable:** AWS A5.14 / ASME SFA-5.14 (ERNiCrMo-4) --- #### **5. Product Applications** Nickelvac HC-276's unparalleled corrosion resistance makes it a first-choice material for the most aggressive industrial environments. * **Chemical Process Industry:** * Reactors, vessels, and columns in chloride-containing environments. * Piping systems, heat exchangers, and pumps for handling sulfuric, hydrochloric, and phosphoric acids. * Components exposed to wet chlorine gas and hypochlorite solutions. * **Pollution Control:** * Flue gas desulfurization (FGD) system components: absorber towers, ducting, fan wheels, and dampers. * Scrubbers for incineration plants. * **Pharmaceutical & Fine Chemical Industries:** * Process equipment requiring high purity and resistance to aggressive process media and cleaning agents. * **Pulp & Paper Industry:** * Digesters, bleach plants, and stock handling systems in corrosive pulping environments. * **Oil & Gas Industry:** * Downhole components, piping, and manifolds for sour service (H₂S-containing environments). --- #### **Summary of Key Advantages** * **Exceptional Versatility:** Outstanding resistance to a vast array of corrosive media, including strong oxidizers and reducing acids. * **Superior Localized Corrosion Resistance:** Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. * **Excellent Weldability:** The low carbon content provides immunity to sensitization and weld decay, allowing it to be used in the as-welded state without post-weld heat treatment. * **Proven Performance:** A long and successful service history in the world's most challenging chemical processing environments. **Disclaimer:** The information provided here is for reference purposes. Specific properties and performance are dependent on the manufacturing process, heat treatment, and final product form. For critical applications in corrosive environments, always consult corrosion data charts and the official material specifications from the alloy producer.

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 3133 gallon liquid totes Special package is available on request.