Alloy 625 (Inconel) vs Alloy C-276 (Hastelloy)
Alloy 625 (Inconel) (UNS N06625) vs Alloy C-276 (Hastelloy) (UNS N10276): chemical composition and mechanical properties side by side.
- Strength: Alloy C-276 (Hastelloy) minimum yield is 283 MPa vs 414 MPa for Alloy 625 (Inconel) (-32%); tensile 690 vs 827 MPa.
- Density: 8.44 vs 8.89 g/cm³ — Alloy C-276 (Hastelloy) is 5.3% heavier.
- Pitting resistance (PREN, min): 46.4 vs 64.0 — higher for Alloy C-276 (Hastelloy).
- Typical use: Alloy 625 (Inconel) — High strength, pitting resistance. Alloy C-276 (Hastelloy) — Severe chemical service.
| Property | Alloy 625 (Inconel) | Alloy C-276 (Hastelloy) |
|---|---|---|
| Family | Nickel-chromium-moly | Nickel-moly-chromium |
| UNS | N06625 | N10276 |
| EN / W.Nr | 2.4856 NiCr22Mo9Nb | 2.4819 NiMo16Cr15W |
| Basis spec | ASTM B564 | ASTM B564 |
| Density g/cm³ | 8.44 | 8.89 |
| Chemical composition, % | ||
| C | 0.10 | 0.010 |
| Mn | 0.50 | 1.0 |
| P | 0.015 | 0.04 |
| S | 0.015 | 0.03 |
| Si | 0.50 | 0.08 |
| Cr | 20.0–23.0 | 14.5–16.5 |
| Ni | 58.0 min | bal |
| Mo | 8.0–10.0 | 15.0–17.0 |
| Ti | 0.40 | – |
| Nb | 3.15–4.15 (Nb+Ta) | – |
| V | – | 0.35 |
| W | – | 3.0–4.5 |
| Fe | 5.0 | 4.0–7.0 |
| Al | 0.40 | – |
| Co | 1.0 | 2.5 |
| Mechanical properties (min) | ||
| Tensile strength | 827 MPa (120 ksi) | 690 MPa (100 ksi) |
| Yield strength (0.2%) | 414 MPa (60 ksi) | 283 MPa (41 ksi) |
| Elongation | 30% | 40% |
| Hardness (max) | – | – |
| PREN (min, from spec) | 46.4 | 64.0 |
Single values are maximums; ranges are min–max; "bal" = balance. Limits are typical of the basis specification for that product form — forgings, pipe and fittings specifications differ slightly. Always check the exact specification, edition and the mill test certificate.
Frequently asked questions
What is the difference between Alloy 625 (Inconel) and Alloy C-276 (Hastelloy)?
Strength: Alloy C-276 (Hastelloy) minimum yield is 283 MPa vs 414 MPa for Alloy 625 (Inconel) (-32%); tensile 690 vs 827 MPa. Density: 8.44 vs 8.89 g/cm³ — Alloy C-276 (Hastelloy) is 5.3% heavier. Pitting resistance (PREN, min): 46.4 vs 64.0 — higher for Alloy C-276 (Hastelloy).
Which is stronger, Alloy 625 (Inconel) or Alloy C-276 (Hastelloy)?
Alloy 625 (Inconel) has the higher minimum yield strength (414 MPa vs 283 MPa).
Last updated 2026-11-02