Incoloy 825
2.4858Nickel-iron-chromium alloy with Mo, Cu, and Ti additions. Excellent resistance to both reducing and oxidizing acids, stress corrosion cracking, and pitting. Cost-effective alternative to pure Ni alloys. Used in chemical processing, pollution control, oil/gas recovery, and acid production.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS N08825 | N08825 | REF |
| 🇺🇸 | UNS | USA | N08825 | N08825 | REF |
| 🇪🇺 | EN | Europe | NiCr21Mo | 2.4858 | 100% |
| 🇩🇪 | DIN | Germany | NiFe30Cr21Mo3 | 2.4858 | 95% |
Sources: ASTM B424, DIN 17744
Chemical composition comparison (wt%)
Side-by-side: Incoloy 825 (ASTM) (ASTM B424) vs NiFe30Cr21Mo3 (DIN)
| Element | Incoloy 825 (ASTM) | NiFe30Cr21Mo3 (DIN) | Overlap |
|---|---|---|---|
| C | 0–0.05% | — | — |
| Mn | 0–1% | — | — |
| S | 0–0.03% | — | — |
| Cr | 19.5–23.5% | — | — |
| Mo | 2.5–3.5% | — | — |
| Ni | 38–46% | — | — |
| Cu | 1.5–3% | — | — |
| Al | 0–0.2% | — | — |
| Ti | 0.6–1.2% | — | — |
| Fe | ≥ 22% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 586 | MPa |
| Yield Strength | ≥ 241 | MPa |
| Elongation | ≥ 30 | % |
| Elastic Modulus | ≥ 196 | GPa |
| Density | ≥ 8.14 | g/cm3 |
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 586 | MPa |
| Yield Strength Rp0.2 | ≥ 241 | MPa |
| Elongation A | ≥ 30 | % |
General
| Property | Value | Unit |
|---|---|---|
| Density | 8.14 | g/cm³ |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| annealing | 940–980 °C | water | 30-60 min | Stabilizing anneal. Ti forms TiC to prevent sensitization. |
Compatibility verdict
Incoloy 825 and NiFe30Cr21Mo3: 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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