Hastelloy C-276
2.4819The most versatile corrosion-resistant alloy available. Ni-Mo-Cr-W composition resists both oxidizing and reducing environments. Outstanding resistance to pitting, stress corrosion cracking, and wet chlorine gas. Used in chemical processing, flue gas desulfurization, pulp & paper, and waste treatment.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS N10276 | N10276 | REF |
| 🇪🇺 | EN | Europe | NiMo16Cr15W | 2.4819 | 100% |
| 🇬🇧 | BS | United Kingdom | NA49 | — | 95% |
| 🇫🇷 | AFNOR | France | NC17D | — | 95% |
Sources: ASTM B575, DIN 17744, BS 3072, AFNOR
Chemical composition comparison (wt%)
Side-by-side: Hastelloy C-276 (ASTM) (ASTM B575) vs NA49 (BS)
| Element | Hastelloy C-276 (ASTM) | NA49 (BS) | Overlap |
|---|---|---|---|
| C | 0–0.01% | — | — |
| Si | 0–0.08% | — | — |
| Mn | 0–1% | — | — |
| Cr | 14.5–16.5% | — | — |
| Mo | 15–17% | — | — |
| Ni | ≥ 51% | — | — |
| V | 0–0.35% | — | — |
| W | 3–4.5% | — | — |
| Co | 0–2.5% | — | — |
| Fe | 4–7% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 690 | MPa |
| Yield Strength | ≥ 310 | MPa |
| Elongation | ≥ 40 | % |
| Elastic Modulus | ≥ 205 | GPa |
| Density | ≥ 8.89 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1120–1180 °C | water | 10-30 min | Rapid quench required. Do not furnace cool — risk of mu-phase precipitation. |
| stress_relief | 870–900 °C | air | 1 hour | After cold forming. Not recommended if maximum corrosion resistance needed. |
Compatibility verdict
Hastelloy C-276 and NA49: 95% composition match
Close equivalents but NOT identical.
Related materials
Hastelloy C-22
2.4602Improved version of Hastelloy C-276 with better resistance to oxidizing media and higher chromium. Considered the most versatile Ni-Cr-Mo alloy for chemical processing. Resists both oxidizing and reducing acids, chlorides, and mixed media. Used for flue gas desulfurization, pharmaceutical, and universal chemical processing.
Alloy 20 / Carpenter 20
2.4660Austenitic Ni-Fe-Cr alloy specifically developed for sulfuric acid resistance. Nb-stabilized against sensitization. Cu addition gives outstanding resistance to H2SO4 at all concentrations up to 80%. Used for sulfuric acid piping, heat exchangers, mixing tanks, pickling equipment, and pharmaceutical processing.
Nimonic 80A
2.4952Nickel-chromium age-hardenable alloy with Ti + Al for gamma-prime strengthening. Developed originally for gas turbine blades. Good creep resistance to ~700°C. Used for exhaust valves, springs at elevated temperatures, nuclear engineering fasteners, and gas turbine components. ≈ UNS N07080.
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