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Inconel 625 (UNS N06625) provides 827 MPa minimum tensile strength and superior resistance to seawater and chloride stress corrosion cracking, making it the stronger choice for marine and structural applications. Hastelloy C-276 (UNS N10276) delivers 690 MPa tensile strength but offers broader acid resistance, particularly excelling in hydrochloric acid (HCl) and sulfuric acid (H2SO4) service where it outperforms virtually all other alloys.
| Property | Inconel 625 | Hastelloy C-276 |
|---|---|---|
| UNS | N06625 | N10276 |
| W.Nr. | 2.4856 | 2.4819 |
| Tensile Strength (RT) | 827 MPa (120 ksi) min. | 690 MPa (100 ksi) min. |
| Tensile Strength (500°C) | ~810 MPa (117 ksi) | ~620 MPa (90 ksi) |
| Tensile Strength (700°C) | ~610 MPa (88.5 ksi) | ~540 MPa (78 ksi) |
| Yield Strength (RT) | 414 MPa (60 ksi) min. | 283 MPa (41 ksi) min. |
| Elongation | 30% min. | 40% min. |
| Max Service Temperature | 982°C (1800°F) | 1038°C (1900°F) |
| Density | 8.44 g/cm³ | 8.89 g/cm³ |
| Hardness | 95 HRB max. | 100 HRB max. |
| Melting Range | 1290–1350°C | 1323–1371°C |
| Medium | Inconel 625 | Hastelloy C-276 |
|---|---|---|
| Seawater / Chlorides | Excellent — high Mo content resists pitting and crevice corrosion; immune to chloride SCC | Very good |
| Sulfuric Acid (H₂SO₄) | Good to 80% concentration at 38°C (<5 mpy) | Excellent — slightly better than 625 |
| Hydrochloric Acid (HCl) | Moderate | Excellent — one of the best alloys for HCl |
| Nitric Acid (HNO₃) | Very good | Good |
| Oxidizing Environments | Very good (22% Cr) | Good (16% Cr) |
| Reducing Environments | Good | Excellent (16% Mo + W) |
| Phosphoric Acid | Good | Excellent |
Higher mechanical strength is required (827 vs 690 MPa tensile), the application involves seawater or chloride environments, weldability is important, or high-temperature structural performance up to 982°C is needed. Common applications: subsea oil & gas, marine hardware, chemical processing vessels, flue gas desulfurization, and aerospace exhaust systems.
Resistance to a broad range of aggressive acids is the primary concern, particularly reducing acids like HCl and H2SO4. C-276 is one of the few alloys that resists hydrochloric acid at all concentrations. Common applications: chemical processing (HCl/H2SO4 service), pollution control, pulp & paper, pharmaceutical equipment, and flue gas scrubbers.
Our metallurgical specialists help you select the right alloy for your application. Contact us for a free technical consultation and quote.