Alloy 825 (UNS N08825) — Chemical Composition & Mechanical Properties
Alloy 825 (UNS N08825) is a nickel alloys grade for nickel alloy forgings, fittings & pipe (UNS N08825, EN / W.Nr 2.4858). It is also known as Incoloy 825 (trade name). This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group manufactures flanges and fittings in this grade.
Alloy 825 (UNS N08825) at a glance
| Specification | Alloy 825 (UNS N08825) |
|---|---|
| Material family | Nickel alloys |
| Product form | Nickel alloy forgings, fittings & pipe |
| UNS number | N08825 |
| EN / W.Nr equivalent | 2.4858 |
| Also known as | Incoloy 825 (trade name) |
| PREN (min values) | 27.8 |
| Document | TG-MG-087 · Rev. 1 · October 2026 |
Typical service
Sulphuric and phosphoric acid, sour oil and gas, pickling
Heat treatment
Annealed
Chemical composition of Alloy 825 (UNS N08825) (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 586 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 241 MPa |
| Elongation, min | 30 % |
| Hardness | Not specified |
About nickel alloys
Nickel alloys are used where stainless steels run out of corrosion or temperature resistance. With 30–99 % nickel and additions of chromium, molybdenum, copper or tungsten, they resist strong acids, chlorides, caustics and oxidation from cryogenic temperatures to above 1000 °C.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
International equivalents of Alloy 825 (UNS N08825)
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — specification | Alloy 825 (UNS N08825) |
| USA — UNS | N08825 |
| Europe — EN designation | NiCr21Mo |
| Europe — W.Nr | 2.4858 |
| Japan — JIS | NCF825 |
| China — GB / NB | NS1402 (GB/T 15007) |
| China — old GB designation | 0Cr21Ni42Mo3Cu2Ti |
| UK — BS (withdrawn) | NA16 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Same alloy in other product forms
| Product form | Specification / grade |
|---|---|
| Flanges & forged fittings | ASTM B564 N08825 |
| Butt-weld fittings | ASTM B366 WPNICMC |
| Seamless pipe | ASTM B423 N08825 |
| Welded pipe | ASTM B705 N08825 |
| Plate | ASTM B424 N08825 |
| Bar | ASTM B425 N08825 |
Standards for Alloy 825 (UNS N08825)
All material standardsFAQ
Alloy 825 (UNS N08825): common questions
What is the minimum yield strength of Alloy 825 (UNS N08825)?
241 MPa, with a minimum tensile strength of 586 MPa.
What is the carbon content of Alloy 825 (UNS N08825)?
0.05 max %.
What is the PREN of Alloy 825 (UNS N08825)?
About 28, calculated as Cr + 3.3Mo + 16N using the specification minimum values. Typical heats are a little higher.
What is the UNS number and EN equivalent of Alloy 825 (UNS N08825)?
UNS N08825; the nearest European designation is W.Nr 2.4858. Equivalents are close but not identical — check the specification if substituting.
How is Alloy 825 (UNS N08825) heat treated?
Annealed.
What is the Chinese (GB) equivalent of Alloy 825 (UNS N08825)?
The nearest Chinese equivalent is NS1402 (GB/T 15007), formerly 0Cr21Ni42Mo3Cu2Ti. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of Alloy 825 (UNS N08825)?
The nearest Japanese (JIS) equivalent is NCF825.
Does Teshi Group supply Alloy 825 (UNS N08825)?
Teshi Group manufactures flanges and fittings in this grade. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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