Alloy C276,Hastelloy C276 Fittings,UNS N10276,E FORU

British Specs:，American Specs:AMS 5750 ASTM B462 ASTM B564 ASTM B574 ASTM B575 ASTM B622 ASTM B626 (Tube *) ASTM B619 ASTM B775，German Specs:WS 2.4819

### **Product Datasheet: Alloy C-276 / Hastelloy C-276 Fittings (UNS N10276)** **Alloy C-276** (commercially known as **Hastelloy C-276**) fittings are precision-engineered components manufactured from nickel-molybdenum-chromium superalloy, designed for critical piping systems requiring exceptional corrosion resistance in aggressive environments. These fittings provide reliable performance in chemical processing, oil and gas, and pollution control applications where system integrity under extreme corrosive conditions is paramount. --- #### **1. Chemical Composition** The chemical composition of Hastelloy C-276 fittings ensures optimal performance in corrosive environments: | Element | Content (%) | |:---|:---| | **Nickel (Ni)** | Balance | | **Molybdenum (Mo)** | 15.0 - 17.0 | | **Chromium (Cr)** | 14.5 - 16.5 | | **Iron (Fe)** | 4.0 - 7.0 | | **Tungsten (W)** | 3.0 - 4.5 | | **Cobalt (Co)** | 2.5 max | | **Manganese (Mn)** | 1.0 max | | **Vanadium (V)** | 0.35 max | | **Silicon (Si)** | 0.08 max | | **Carbon (C)** | 0.01 max | | **Phosphorus (P)** | 0.025 max | | **Sulfur (S)** | 0.01 max | *Note: The low carbon and silicon content minimizes carbide precipitation during welding operations, maintaining excellent corrosion resistance in the heat-affected zone of welded fittings.* --- #### **2. Physical Properties** Hastelloy C-276 fittings exhibit consistent physical properties: | Property | Value | |:---|:---| | **Density** | 8.89 g/cm³ (0.321 lb/in³) | | **Melting Range** | 1325 - 1370°C (2420 - 2500°F) | | **Coefficient of Thermal Expansion** | 11.2 × 10⁻⁶/°C (20-100°C) | | **Thermal Conductivity** | 10.2 W/m·K (at 100°C) | | **Specific Heat** | 427 J/kg·K (at 100°C) | | **Modulus of Elasticity** | 205 GPa (29.7 × 10⁶ psi) | | **Magnetic Permeability** | <1.001 (essentially non-magnetic) | --- #### **3. Mechanical Properties** **Standard Mechanical Properties (Annealed Condition):** | Property | Value | |:---|:---| | **Tensile Strength** | 790 MPa (115 ksi) min | | **Yield Strength (0.2% Offset)** | 415 MPa (60 ksi) min | | **Elongation** | 55% min | | **Reduction of Area** | 65% min | | **Hardness** | 90 HRB max | | **Impact Strength (Charpy V-Notch)** | 100 J min | **Pressure Ratings:** - **Working Pressure:** Up to 6,000 psi depending on fitting type and size - **Temperature Range:** -196°C to 1090°C (-320°F to 2000°F) - **Safety Factor:** 4:1 minimum burst pressure to working pressure --- #### **4. Product Specifications** **Available Fitting Types:** - **Butt Weld Fittings:** Elbows 45°/90°/180°, tees, reducers, caps - **Socket Weld Fittings:** Unions, elbows, tees, couplings - **Threaded Fittings:** NPT, BSPT, BSPP threads - **Flanged Components:** Orifice flanges, blind flanges, spectacle blinds - **Special Fittings:** Instrumentation, hydraulic, and subsea fittings **Size Ranges:** - **Butt Weld:** 1/8" to 48" NPS - **Socket Weld:** 1/8" to 4" NPS - **Threaded:** 1/8" to 2" NPS - **Pressure Classes:** 150# to 2500# --- #### **5. Product Applications** **Chemical Processing Industry:** - **Reactor Systems:** Heat exchanger and reactor connections - **Process Piping:** Corrosive chemical transfer lines - **Distillation Columns:** Vapor and liquid line fittings - **Pressure Vessel Connections:** Nozzles and access fittings - **Acid Handling Systems:** Sulfuric, hydrochloric, phosphoric acids **Oil & Gas Industry:** - **Wellhead Components:** Christmas tree fittings, tubing heads - **Production Manifolds:** Flow lines, gathering systems - **Subsea Systems:** Connectors, jumpers, manifold fittings - **Refinery Piping:** High-pressure and high-temperature systems - **Sour Service Applications:** H₂S and CO₂ resistant fittings **Pollution Control:** - **Flue Gas Desulfurization:** Scrubber system fittings - **Waste Treatment Plants:** Chemical waste piping components - **Air Pollution Control:** Ducting and stack connections - **Water Treatment:** Chemical dosing and treatment systems **Pharmaceutical Industry:** - **Process Piping:** High-purity chemical transfer systems - **Bioreactor Connections:** Sterile process connections - **Clean Utility Systems:** WFI and pure steam distribution - **CIP/SIP Systems:** Clean-in-place and sterilize-in-place lines --- #### **6. International Standards** **Material Standards:** - **UNS N10276**: Unified Numbering System designation - **ASTM B366**: Standard Specification for Factory-Made Wrought Nickel Alloy Fittings - **ASTM B564**: Standard Specification for Nickel Alloy Forgings - **ASME SB366**: ASME Boiler and Pressure Vessel Code - **MSS SP-43**: Wrought Stainless Steel Fittings **Dimensional Standards:** - **ASME B16.9**: Factory-Made Wrought Buttwelding Fittings - **ASME B16.11**: Forged Steel Fittings, Socket-Welding and Threaded - **ASME B16.5**: Pipe Flanges and Flanged Fittings - **ISO 9001**: Quality Management Systems **Industry Specifications:** - **NACE MR0175/ISO 15156**: For sour service applications - **API 6A**: Wellhead and Christmas Tree Equipment - **API 17D**: Subsea Production Equipment - **PED 2014/68/EU**: Pressure Equipment Directive --- #### **7. Corrosion Resistance** **Excellent Performance In:** - **Hydrochloric Acid:** All concentrations and temperatures - **Sulfuric Acid:** Wide concentration range up to 70% - **Phosphoric Acid:** All concentrations and temperatures - **Chloride Solutions:** Superior pitting and crevice corrosion resistance - **Wet Chlorine Gas:** Outstanding performance - **Organic Acids:** Formic, acetic, and other organic acids **Corrosion Performance:** - **Critical Pitting Temperature:** >85°C - **Critical Crevice Temperature:** >65°C - **Pitting Resistance Equivalent Number (PREN):** ~69 - **General Corrosion Rate:** <0.1 mm/year in most aggressive media --- #### **8. Manufacturing Processes** **Fabrication Methods:** - **Hot Forging:** For superior grain structure and strength - **Precision Machining:** From bar stock or forgings - **Investment Casting:** For complex geometries - **Fabrication:** From pipe and plate materials **Quality Processes:** - **Solution Annealing:** 1120-1175°C (2050-2150°F) + rapid quench - **Surface Treatment:** Pickling, passivation, and special coatings - **Non-Destructive Testing:** RT, UT, MT, PT as required - **Dimensional Inspection:** 100% dimensional verification --- #### **9. Installation & Maintenance** **Welding Procedures:** - **Processes:** GTAW (preferred), GMAW, SMAW - **Filler Metals:** ERNiCrMo-4 - **Preheat:** Generally not required - **Post-Weld Heat Treatment:** Usually not necessary - **Welding Qualifications:** Per ASME Section IX **Installation Guidelines:** - **Alignment:** Proper alignment to prevent stress concentration - **Support:** Adequate piping support near fittings - **Gasket Selection:** Appropriate for service conditions - **Bolt Torque:** Proper sequencing and torque values --- #### **10. Quality Assurance** **Testing & Certification:** - **Material Certification:** EN 10204 3.1/3.2 - **Chemical Analysis:** Verified composition - **Mechanical Testing:** Tensile, hardness, impact tests - **Non-Destructive Examination:** RT, UT, MT, PT as specified - **Pressure Testing:** Hydrostatic or pneumatic testing - **Dimensional Inspection:** To specified tolerances **Traceability Requirements:** - **Heat Number Traceability:** Full material history - **Process Control:** Documented manufacturing processes - **Final Inspection:** Comprehensive quality verification - **Certification Packages:** Complete documentation provided --- #### **11. Key Advantages** * **Exceptional Corrosion Resistance:** Outstanding performance in diverse corrosive environments * **High Strength Capability:** Maintains mechanical properties at elevated temperatures * **Reliable Performance:** Proven in critical service applications * **Industry Compliance:** Meets major international standards and specifications * **Versatile Applications:** Suitable for various fitting types and services * **Long Service Life:** Reduced maintenance and replacement costs * **Quality Assurance:** Comprehensive testing and certification * **Global Availability:** Standard and custom fittings available Hastelloy C-276 fittings provide engineers and operators with reliable, high-performance connection solutions for the most demanding corrosive service applications, offering exceptional resistance to a wide range of aggressive chemicals while maintaining structural integrity and pressure containment capabilities in chemical processing, oil and gas, and pollution control industries.

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 2035 gallon liquid totes Special package is available on request.