Hastelloy C-276 Korrosionsbeständigkeit: 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): - Streckgrenze: 355 MPa (52 ksi) minimum - Zugfestigkeit: 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). Kosten differential: Hastelloy C-276 bei $150-200/kg versus 316L bei $5-8/kg. Für sulfuric acid service über 60°C, C-276's 8+ year life versus 316L's 1-year replacement cycle yields unter lifecycle kosten despite 20-25x material premium. **Key Anwendungen：** - Chemical processing: Reactors, heat exchangers, piping für sulfuric/hydrochloric/phosphoric acid - Pulp & paper: Bleach plant ausrüstung in chlorine/chlorine dioxide environments - Pollution steuerung: Scrubbers, ductwork für acidic flue gas - Pharmaceutical: Reinigen-in-place (CIP) systems requiring broad acid widerstand - Öl & Gas: Sour gas components (H2S + CO2 + chloride combinations) **Schweißeignung (ASTM B575 + Haynes Guidance）：** Hastelloy C-276 welds readily mit GTAW, GMAW, SMAW. Filler metal: ERNiCrMo-4 (AWS A5.14). Key consideration: minimize heat input zu avoid sensitization — C-276 ist niedrig-carbon (0.01% max) specifically designed zu resist carbide precipitation während welding. Post-weld solution anneal ist recommended für maximum corrosion widerstand in severe environments.
Quick Facts
| Kategorie | Nickel Alloy |
| Norm | 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) |
| Härte | 170-210 HB |
| Creep Strength | Excellent widerstand zu stress corrosion cracking in chloride environments |
Physical Eigenschaften
| Melting Bereich | 1325-1370 °C |
| Wärmeleitfähigkeit | 10.2 W/m·K bei 20°C |
| Electrical Resistivity | 0.000124 Ω·cm bei 20°C |
| Spezifisch Heat | 427 J/kg·K bei 20°C |
| Coefficient Von Expansion | 11.2 µm/m·°C (20-100°C) |
Global Equivalents & Cross-Referenz
Verwandt Materials
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Frequently Asked Questions
Wie tut Hastelloy C-276 compare zu Inconel 625 für corrosion widerstand?
Hastelloy C-276 hat higher molybdenum (15-17% vs 8-10%) und tungsten (3-4.5% vs none), providing superior widerstand zu reducing acids (HCl, H2SO4). Inconel 625 hat higher chromium (20-23% vs 14.5-16.5%), providing better oxidation widerstand bei elevated temperatures. Choose C-276 für strong acid environments (chemical processing); choose 625 für hoch-temperature oxidation oder seawater applications.
Können Hastelloy C-276 handle hydrochloric acid bei elevated temperatures?
Ja — Haynes TDS shows Hastelloy C-276 corrosion rate <0.05 mm/year in 20% HCl bei 65°C. Dies ist exceptional leistung — 316L SS würde corrode bei >5 mm/year in der gleich conditions (100x difference). Hastelloy C-276 ist der industry standard für hydrochloric acid service wo stainless steels fail rapidly.
Was ist der kosten premium für Hastelloy C-276 über stainless steel?
Market daten: Hastelloy C-276 pricing $150-200/kg versus 316L SS bei $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 für 316L. Lifecycle kosten analysis (material + fabrication + replacement downtime) oft favors C-276 despite initial premium.
References & International Standards
- ASTM International. Norm Specifications für Stahl & Metal Alloys. astm.org
- International Organization für Standardization (ISO). Metallic Materials — Cross-Referenz Database. iso.org
- American Iron und Stahl Institute (AISI). Stahl Güte Designations & Equivalents. steel.org
- European Committee für Standardization (CEN). EN Stahl Standards & Numbering System. cencenelec.eu
Nickel & Superalloys — Engineering Referenz
Nickel-based superalloys und specialty alloys operate in environments das würde destroy conventional steels: jet motor turbines bei 1,800°F, chemical reactors mit concentrated acid, deep-sea ausrüstung unter extreme pressure. Diese materials command premium prices — und premium engineering attention.
ASTM B168/B435/B637, AMS 5544/5596, ISO 6208/9723
Gas turbine blades, nuclear reactor components, chemical processing ausrüstung, öl & gas downhole tools, aerospace fasteners, medical prosthetics
Nickel alloy fabrication requires specialized welding procedures. Inconel 718 ist typically welded in der solution-annealed condition, dann age-hardened. Hastelloy C276 requires niedrig heat input zu prevent sensitization. Immer consult der mill's recommended welding parameters.