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Alloy 20 — ASTM Equivalent

Holding a datasheet that specifies Alloy 20 (Wrought equivalent)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of Alloy 20?

Alloy 20 is a Wrought equivalent designation corresponding to ASTM A351 CN7M (Alloy 20 Cast (CN7M)) 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.

A351 CN7M

Stainless Steel

Alloy 20 Cast (CN7M) - cast form.

Service temperature-73°C to +400°C
Nominal compositionFe bal., Ni 27.5–30.5%, Cr 19.0–22.0%, Mo 2.0–3.0%, Cu 3.0–4.0%, Nb 8×C min, C ≤ 0.07%, Mn ≤ 1.50%, Si ≤ 1.50%. UNS J95150.

Typical service: Sulphuric acid at concentrations 5–98% and temperatures up to 80°C; Phosphoric acid and mixed acid (H₂SO₄ + H₃PO₄) service; Sodium bisulphate and acidic salt solutions

Also designated:J95150 [UNS (cast)]Alloy 20 [Wrought equivalent]N08020 (A182 F20) [Wrought equivalent]
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

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A351 CN7M full grade pageAlloy 20 Cast (CN7M)Equivalence MatrixAll 43 grades across 7 systemsDesignation lookup directoryEvery foreign designation indexed