Hastelloy® C276 Alloy Specification
High-Performance Nickel-Based Alloy for Severe Corrosive Environments
Product Specification
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Standard: ASTM B575 (USA), UNS N10276
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Material Designation: Hastelloy® C276, Nickel-Molybdenum-Chromium Alloy
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Tolerance: h7-h11 (available on request)
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Melt Method: Vacuum Induction Melting (VIM) + Electroslag Remelting (ESR)
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Available Forms & Sizes:
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Sheet/Strip/Foil: 0.5mm to 50mm thick
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Tube: OD φ6mm to φ325mm, Wall thickness from 1mm
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Bar/Wire: φ5mm to φ200mm diameter
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Forgings & Custom Profiles: Available upon request
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Chemical Composition (wt%)
| Element | Min | Max |
|---|---|---|
| Nickel (Ni) | Balance | – |
| Chromium (Cr) | 14.5 | 16.5 |
| Molybdenum (Mo) | 15.0 | 17.0 |
| Iron (Fe) | 4.0 | 7.0 |
| Tungsten (W) | 3.0 | 4.5 |
| Cobalt (Co) | – | 2.5 |
| Manganese (Mn) | – | 1.0 |
| Silicon (Si) | – | 0.08 |
| Vanadium (V) | – | 0.35 |
| Carbon (C) | – | 0.01 |
| Phosphorus (P) | – | 0.025 |
| Sulfur (S) | – | 0.01 |
Corrosion Resistance
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Characteristics: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking.
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Suitable Media:
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Wet chlorine, hypochlorites, chlorine dioxide solutions
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Sulfuric, hydrochloric, phosphoric, and various organic acids
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Hydrogen fluoride gas with chloride impurities
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High-temperature mixed inorganic acids and media
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Key Advantage: The low carbon content effectively controls carbide precipitation in the heat-affected zone, maintaining excellent corrosion resistance in the as-welded condition.
Physical & Mechanical Properties
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Density: 8.89 g/cm³
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Melting Point: ≈ 1325 – 1370 °C
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Thermal Expansion Coefficient: 11.2 μm/m·°C (20-100°C)
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Thermal Conductivity: 10.1 W/m·K (100°C)
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Electrical Resistivity: 1.30 μΩ·m
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Modulus of Elasticity: 205 GPa
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Tensile Strength: ≥ 690 MPa
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Yield Strength (0.2% Offset): ≥ 283 MPa
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Elongation: ≥ 40%
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Hardness: ≤ 90 HRB
Applications
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Reactors, heat exchangers, piping, and valves in the chemical process industry
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Scrubbers, fans, and dampers in Flue Gas Desulfurization (FGD) systems
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Acidic process stream equipment in the pharmaceutical industry
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Bleaching systems in the pulp and paper industry
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Incineration and flue gas handling systems in waste treatment plants
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Marine engineering and seawater cooling systems
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Production equipment in sour oil and gas fields
Special Processing Notes
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Heat Treatment: Solution annealing is recommended. The typical process is 1120°C – 1170°C followed by rapid water quenching.
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Welding: Excellent weldability. Suitable processes include GTAW (TIG) and GMAW (MIG). Matching filler metals (e.g., ERNiCrMo-4) are recommended.
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Cold Working: This is a work-hardening alloy. Annealing is required after cold working to restore corrosion resistance and ductility.
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Cleaning & Storage: Components must be thoroughly cleaned after processing to remove oils and metallic particles. Store in a clean, dry environment and avoid contact with ferrous materials to prevent contamination.
Disclaimer: Hastelloy® C276 is a registered trademark of Haynes International Inc. This specification is for informational purposes only and properties may vary based on product form, size, and processing.
