Alloy 600 (Inconel) vs Alloy 625 (Inconel)
Alloy 600 (Inconel) (UNS N06600) vs Alloy 625 (Inconel) (UNS N06625): chemical composition and mechanical properties side by side.
- Strength: Alloy 625 (Inconel) minimum yield is 414 MPa vs 240 MPa for Alloy 600 (Inconel) (+72%); tensile 827 vs 550 MPa.
- Density: 8.47 vs 8.44 g/cm³ — Alloy 600 (Inconel) is 0.4% heavier.
- Pitting resistance (PREN, min): 14.0 vs 46.4 — higher for Alloy 625 (Inconel).
- Typical use: Alloy 600 (Inconel) — Oxidation and high-temperature resistance. Alloy 625 (Inconel) — High strength, pitting resistance.
| Property | Alloy 600 (Inconel) | Alloy 625 (Inconel) |
|---|---|---|
| Family | Nickel-chromium | Nickel-chromium-moly |
| UNS | N06600 | N06625 |
| EN / W.Nr | 2.4816 NiCr15Fe | 2.4856 NiCr22Mo9Nb |
| Basis spec | ASTM B564 | ASTM B564 |
| Density g/cm³ | 8.47 | 8.44 |
| Chemical composition, % | ||
| C | 0.15 | 0.10 |
| Mn | 1.0 | 0.50 |
| P | – | 0.015 |
| S | 0.015 | 0.015 |
| Si | 0.5 | 0.50 |
| Cr | 14.0–17.0 | 20.0–23.0 |
| Ni | 72.0 min | 58.0 min |
| Mo | – | 8.0–10.0 |
| Cu | 0.5 | – |
| Ti | – | 0.40 |
| Nb | – | 3.15–4.15 (Nb+Ta) |
| Fe | 6.0–10.0 | 5.0 |
| Al | – | 0.40 |
| Co | – | 1.0 |
| Mechanical properties (min) | ||
| Tensile strength | 550 MPa (80 ksi) | 827 MPa (120 ksi) |
| Yield strength (0.2%) | 240 MPa (35 ksi) | 414 MPa (60 ksi) |
| Elongation | 30% | 30% |
| Hardness (max) | – | – |
| PREN (min, from spec) | 14.0 | 46.4 |
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 600 (Inconel) and Alloy 625 (Inconel)?
Strength: Alloy 625 (Inconel) minimum yield is 414 MPa vs 240 MPa for Alloy 600 (Inconel) (+72%); tensile 827 vs 550 MPa. Density: 8.47 vs 8.44 g/cm³ — Alloy 600 (Inconel) is 0.4% heavier. Pitting resistance (PREN, min): 14.0 vs 46.4 — higher for Alloy 625 (Inconel).
Which is stronger, Alloy 600 (Inconel) or Alloy 625 (Inconel)?
Alloy 625 (Inconel) has the higher minimum yield strength (414 MPa vs 240 MPa).
Last updated 2026-11-02