Designation Cross-Reference

GS-17CrMo55 — ASTM Equivalent

Holding a datasheet that specifies GS-17CrMo55 (DIN)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of GS-17CrMo55?

GS-17CrMo55 is a DIN 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 GS-17CrMo55 / its ASTM equivalent?

We supply A217 WC9 valves - the GS-17CrMo55 equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

Request a Quote WhatsApp Call

Products

Browse All Valve Products

Engineering references

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