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NiCr21Mo — ASTM Equivalent

Holding a datasheet that specifies NiCr21Mo (EN)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of NiCr21Mo?

NiCr21Mo is a EN designation corresponding to ASTM B425 / UNS N08825 (Incoloy 825) (Incoloy 825) for industrial valve service. The full grade data is below - equivalence is by nominal chemistry and mechanical class, so confirm composition and heat-treat condition against the governing standard before substituting in critical service.

B425 / UNS N08825 (Incoloy 825)

Nickel Alloys

Incoloy 825 - both form.

Service temperature-196°C to +450°C
Nominal compositionNi 38–46%, Cr 19.5–23.5%, Fe balance, Mo 2.5–3.5%, Cu 1.5–3.0%, Ti 0.6–1.2%, Al ≤ 0.20%. UNS N08825.

Typical service: Sulphuric acid (weak to moderate concentrations); Phosphoric acid and phosphate fertiliser plants; Polluted seawater and produced water containing H₂S

Also designated:N08825 [UNS]NiCr21Mo [EN]2.4858 [EN]
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Need valves in NiCr21Mo / its ASTM equivalent?

We supply B425 / UNS N08825 (Incoloy 825) valves - the NiCr21Mo equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

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Engineering references

B425 / UNS N08825 (Incoloy 825) full grade pageIncoloy 825Equivalence MatrixAll 43 grades across 7 systemsDesignation lookup directoryEvery foreign designation indexed