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622 Grade 31 — ASTM Equivalent

Holding a datasheet that specifies 622 Grade 31 (BS 1504)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of 622 Grade 31?

622 Grade 31 is a BS 1504 designation corresponding to ASTM A217 WC9 (Chrome-Moly WC9 (2.25Cr-1Mo)) 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.

A217 WC9

Chrome-Moly / Alloy Steel

Chrome-Moly WC9 (2.25Cr-1Mo) - cast form.

Service temperature-18°C to +593°C
Nominal compositionC ≤ 0.18%, Cr 2.00–2.75%, Mo 0.90–1.20%, Mn 0.40–0.70%. Martensitic after heat treatment.

Typical service: Main steam (MS) service - coal, gas, and nuclear power plants; Hot reheat steam (HRH); HP feedwater - Class 600–900, up to 593°C

Also designated:GP240GH [EN]1.0619 (not direct equiv.) [EN]GS-17CrMo55 [DIN]622 Grade 31 [BS 1504]
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Connected Engineering

Materials
A217 WC9 Chrome-Moly

Need valves in 622 Grade 31 / its ASTM equivalent?

We supply A217 WC9 valves - the 622 Grade 31 equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

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Engineering references

A217 WC9 full grade pageChrome-Moly WC9 (2.25Cr-1Mo)Equivalence MatrixAll 43 grades across 7 systemsDesignation lookup directoryEvery foreign designation indexed