Designation Cross-Reference

22-5-3N — ASTM Equivalent

Holding a datasheet that specifies 22-5-3N (ISO)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of 22-5-3N?

22-5-3N is a ISO designation corresponding to ASTM A995 CD4MCu / A890 4A (Duplex SS Cast (CD4MCu)) 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.

A995 CD4MCu / A890 4A

Duplex & Super Duplex

Duplex SS Cast (CD4MCu) - cast form.

Service temperature-40°C to +300°C

Nominal compositionCr 21.0–23.5%, Ni 4.5–6.5%, Mo 2.5–3.5%, N 0.10–0.30%, Cu 0.20–0.80%. Duplex ferrite-austenite microstructure.

Typical service: Seawater systems - offshore platforms, FPSO, desalination; High-chloride brine and produced water; HCl service (limited concentrations)

Also designated:1.4470 [EN]X2CrNiMoN22-5-3 [EN]22-5-3N [ISO]

Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

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Need valves in 22-5-3N / its ASTM equivalent?

We supply A995 CD4MCu / A890 4A valves - the 22-5-3N equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

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Engineering references

A995 CD4MCu / A890 4A full grade pageDuplex SS Cast (CD4MCu)Equivalence MatrixAll 43 grades across 7 systems Designation lookup directoryEvery foreign designation indexed