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Selecting the right alloy for aggressive chemical environments is a decisive factor in plant safety and lifecycle cost control. Hastelloy C276 (UNS N10276 / W.Nr. 2.4819) is widely recognized as the industry benchmark for universal corrosion resistance, capable of performing in both strongly oxidizing and reducing media. Shanghai COCESS Special Alloys Co., Ltd supplies fully certified C276 materials—including plate, sheet, bar, seamless pipe, welded pipe, and flanges—manufactured and inspected in strict accordance with ASTM and ASME standards, serving global chemical processing, oil & gas, and environmental engineering projects.
The corrosion resistance of Hastelloy C276 stems from its high molybdenum and chromium content, stabilized by tungsten and an ultra-low carbon level. The chemical composition (weight %) is controlled within the following ranges:
Nickel (Ni): Balance (approx. 57%)
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%
Manganese (Mn): ≤ 1.0%
Vanadium (V): ≤ 0.35%
Carbon (C): ≤ 0.01%
Silicon (Si): ≤ 0.08%
Phosphorus (P): ≤ 0.04%
Sulfur (S): ≤ 0.03%
The carbon content is limited to 0.01% maximum to prevent grain-boundary carbide precipitation during welding, which allows C276 components to be used in the as-welded condition without intergranular corrosion susceptibility in most environments.
Engineers and designers can reference the following typical property data for material calculation and specification:
Density: 8.89 g/cm³ (0.321 lb/in³)
Melting Range: 1325 – 1370 °C (2415 – 2500 °F)
Specific Heat (20 °C): 427 J/kg·°C
Thermal Conductivity (20 °C): 10.2 W/m·°C
Coefficient of Thermal Expansion (20–100 °C): 11.2 × 10⁻⁶ /°C
Young’s Modulus (20 °C): 205 GPa (29.7 × 10⁶ psi)
Electrical Resistivity (20 °C): 1.30 µΩ·m
Magnetic Permeability: ~1.0004 (essentially non-magnetic)
Mechanical properties in the solution-annealed condition (minimum per ASTM):
Tensile Strength (Rm): ≥ 690 MPa (≥ 100 ksi)
Yield Strength (Rp0.2): ≥ 283 MPa (≥ 41 ksi)
Elongation (in 50 mm): ≥ 40%
Hardness: ≤ 100 HRB (≤ 241 HB)
Hastelloy C276 is specified because it resists a broader range of severe corrosives than most stainless steels and many other nickel alloys:
Hydrochloric acid (HCl): Resists all concentrations at temperatures up to about 40 °C, and dilute HCl (below ~2%) near the boiling point.
Sulfuric acid (H₂SO₄): Performs across wide concentration and temperature ranges, including mixed acid streams with oxidizing contaminants.
Phosphoric acid: Good resistance across concentrations up to the boiling point at lower concentrations (<65%).
Wet chlorine, hypochlorites, chlorine dioxide: Excellent resistance in aqueous chlorine-bearing environments.
Chloride pitting and crevice corrosion: High Mo and W contents provide strong resistance to localized attack in seawater and brine.
Stress corrosion cracking (SCC): The high nickel matrix offers reliable resistance to chloride-induced SCC.
These characteristics make C276 suitable for processes where conditions may shift between oxidizing and reducing regimes, or where unexpected upsets occur.
Shanghai COCESS Special Alloys Co., Ltd stocks and supplies C276 in the following common forms with corresponding ASTM references:
Plate, Sheet, Strip: ASTM B575 / ASME SB575
Rod, Bar, Forging: ASTM B574 / ASME SB574; ASTM B564 / ASME SB564
Seamless Pipe & Tube: ASTM B622 / ASME SB622
Welded Pipe: ASTM B619 / ASME SB619
, ASTM B626 / ASME SB626
Butt-weld Fittings: ASTM B366 / ASME SB366
Materials are supplied with EN 10204 3.1 mill test certificates as default; third-party inspection (SGS, BV, TÜV, etc.) can be arranged upon request.
Because of its proven performance, Hastelloy C276 is routinely used in:
Chemical processing: Reactors, heat exchangers, distillation columns, absorbers, and transfer piping handling HCl, H₂SO₄, H₃PO₄, organic acids, and mixed acids.
Oil & gas / offshore: Components exposed to sour gas (H₂S), brine, and chloride environments, including valve parts, pump shafts, and seawater systems.
Flue gas desulfurization (FGD): Scrubbers, absorbers, ducts, and dampers where condensing flue gases form aggressive acidic solutions.
Pharmaceutical & fine chemical: Process vessels and piping requiring clean, corrosion-resistant surfaces and compatibility with CIP/SIP cleaning regimes.
Waste treatment / incineration: Equipment exposed to chlorides, halogens, and acidic condensates.
To support international buyers, Shanghai COCESS Special Alloys Co., Ltd provides:
Inventory availability in popular sizes of plate, bar, pipe, and flange.
Cut-to-length, cutting, and simple machining services to reduce on-site processing.
Full traceability from melt to finished product, with MTRs and inspection records.
Technical clarification on welding consumables (commonly ERNiCrMo-4) and fabrication considerations.
Export packaging and logistics coordination for door-to-door delivery.
For inquiries, material data sheets, stock status, or project-based quotations on Corrosion Resistant Hastelloy C276 products, contact Shanghai COCESS Special Alloys Co., Ltd directly. Our aim is to supply verifiable, standards-compliant alloy materials that help your equipment perform reliably in the most demanding industrial environments.
Website: https://en.cocessalloys.com
Email: sales@cocessalloys.com
