Hastelloy C-276 Corrosion Resistance: ASTM B575 + Haynes TDS + Chemical Processing Applications
ASTM B575 / UNS N06002 · Published: 2026-07-06 · Updated: July 2026
Hastelloy C-276 (UNS N06002) is a nickel-molybdenum-chromium alloy with one of the broadest corrosion resistance profiles in the superalloy family. ASTM B575 specifies Hastelloy C-276 sheet, strip, and plate. The alloy's exceptional resistance to...
Hastelloy C-276 (UNS N06002) is a nickel-molybdenum-chromium alloy with one of the broadest corrosion resistance profiles in the superalloy family. ASTM B575 specifies Hastelloy C-276 sheet, strip, and plate. The alloy's exceptional resistance to reducing acids (sulfuric, hydrochloric) and oxidizing environments derives from its high molybdenum (15-17%) and chromium (14.5-16.5%) content with tungsten (3-4.5%) addition for enhanced resistance to localized corrosion. **实测数据（Haynes International Hastelloy C-276 TDS + ASTM B575）：** Room Temperature Properties (ASTM B575): - Yield Strength: 355 MPa (52 ksi) minimum - Tensile Strength: 760 MPa (110 ksi) minimum - Elongation: 40% minimum Corrosion Performance (Haynes TDS 实测): - Sulfuric Acid (10-60%): <0.1 mm/year corrosion rate at 80°C (实测：优于316L SS 100倍以上 in 50% H2SO4) - Hydrochloric Acid (1-20%): <0.05 mm/year at 65°C - Phosphoric Acid: <0.025 mm/year in 85% H3PO4 at 100°C - Wet Chlorine Gas: Resistant up to 150°C (316L SS fails rapidly) **Composition (ASTM B575)：** - Nickel: 57% balance - Molybdenum: 15-17% - Chromium: 14.5-16.5% - Tungsten: 3-4.5% - Iron: 4-7% - Cobalt: 2.5% maximum **Why Hastelloy C-276 vs C-4 vs C-22 (Manufacturer Guidance)：** Hastelloy C-276: Broadest corrosion resistance, excellent for both reducing and oxidizing acids. Industry standard for chemical processing. Hastelloy C-22: Higher chromium (20-22.5%), better for oxidizing environments (chlorine, hypochlorite, nitric acid). Hastelloy C-4: Lower tungsten, designed for high-temperature stability in reducing acids. **实测应用案例（Haynes + Industry Reference）：** Chemical plant case: Hastelloy C-276 reactor vessel for 50% sulfuric acid at 80°C — 8-year service life with zero measurable corrosion. Previous 316L vessel failed at 14 months due to uniform corrosion (rate >2 mm/year). Cost differential: Hastelloy C-276 at $150-200/kg versus 316L at $5-8/kg. For sulfuric acid service above 60°C, C-276's 8+ year life versus 316L's 1-year replacement cycle yields lower lifecycle cost despite 20-25x material premium. **Key Applications：** - Chemical processing: Reactors, heat exchangers, piping for sulfuric/hydrochloric/phosphoric acid - Pulp & paper: Bleach plant equipment in chlorine/chlorine dioxide environments - Pollution control: Scrubbers, ductwork for acidic flue gas - Pharmaceutical: Clean-in-place (CIP) systems requiring broad acid resistance - Oil & Gas: Sour gas components (H2S + CO2 + chloride combinations) **Weldability (ASTM B575 + Haynes Guidance）：** Hastelloy C-276 welds readily with GTAW, GMAW, SMAW. Filler metal: ERNiCrMo-4 (AWS A5.14). Key consideration: minimize heat input to avoid sensitization — C-276 is low-carbon (0.01% max) specifically designed to resist carbide precipitation during welding. Post-weld solution anneal is recommended for maximum corrosion resistance in severe environments.
Quick Facts
| Category | Nickel Alloy |
| Standard | ASTM B575 / UNS N06002 |
| Density | 8.89 g/cm³ |
| Yield Strength | 355 MPa (52 ksi) minimum |
| Tensile Strength | 760 MPa (110 ksi) minimum |
Detailed Mechanical Properties
| Elongation | 40% minimum (ASTM B575) |
| Hardness | 170-210 HB |
| Creep Strength | Excellent resistance to stress corrosion cracking in chloride environments |
Physical Properties
| Melting Range | 1325-1370 °C |
| Thermal Conductivity | 10.2 W/m·K at 20°C |
| Electrical Resistivity | 0.000124 Ω·cm at 20°C |
| Specific Heat | 427 J/kg·K at 20°C |
| Coefficient Of Expansion | 11.2 µm/m·°C (20-100°C) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| UNS N06002 | Compare |
| Werkstoff 2.4819 | Compare |
| NiMo16Cr15W (EN) | Compare |
Related Materials
🧮 Material Weight Calculator
Calculate the weight based on this material's density: 8.89 g/cm³
Frequently Asked Questions
How does Hastelloy C-276 compare to Inconel 625 for corrosion resistance?
Hastelloy C-276 has higher molybdenum (15-17% vs 8-10%) and tungsten (3-4.5% vs none), providing superior resistance to reducing acids (HCl, H2SO4). Inconel 625 has higher chromium (20-23% vs 14.5-16.5%), providing better oxidation resistance at elevated temperatures. Choose C-276 for strong acid environments (chemical processing); choose 625 for high-temperature oxidation or seawater applications.
Can Hastelloy C-276 handle hydrochloric acid at elevated temperatures?
Yes — Haynes TDS shows Hastelloy C-276 corrosion rate <0.05 mm/year in 20% HCl at 65°C. This is exceptional performance — 316L SS would corrode at >5 mm/year in the same conditions (100x difference). Hastelloy C-276 is the industry standard for hydrochloric acid service where stainless steels fail rapidly.
What is the cost premium for Hastelloy C-276 over stainless steel?
Market data: Hastelloy C-276 pricing $150-200/kg versus 316L SS at $5-8/kg — approximately 20-25x premium. However, in aggressive acid service (sulfuric >60°C, hydrochloric), C-276 provides 5-10 year service life versus 1-2 year for 316L. Lifecycle cost analysis (material + fabrication + replacement downtime) often favors C-276 despite initial premium.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu
Nickel & Superalloys — Engineering Reference
Nickel-based superalloys and specialty alloys operate in environments that would destroy conventional steels: jet engine turbines at 1,800°F, chemical reactors with concentrated acid, deep-sea equipment under extreme pressure. These materials command premium prices — and premium engineering attention.
ASTM B168/B435/B637, AMS 5544/5596, ISO 6208/9723
Gas turbine blades, nuclear reactor components, chemical processing equipment, oil & gas downhole tools, aerospace fasteners, medical prosthetics
Nickel alloy fabrication requires specialized welding procedures. Inconel 718 is typically welded in the solution-annealed condition, then age-hardened. Hastelloy C276 requires low heat input to prevent sensitization. Always consult the mill's recommended welding parameters.