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Grade B2 — ASTM Equivalent

Holding a datasheet that specifies Grade B2 (BS)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of Grade B2?

Grade B2 is a BS designation corresponding to ASTM A217 WC11 (1¼Cr-½Mo) (WC11 Chrome-Moly Alloy Steel) 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 WC11 (1¼Cr-½Mo)

Chrome-Moly / Alloy Steel

WC11 Chrome-Moly Alloy Steel - cast form.

Service temperature-29°C to +538°C
Nominal compositionC ≤ 0.15–0.21%, Mn 0.50–0.80%, Si ≤ 0.60%, Cr 1.00–1.50%, Mo 0.45–0.65%, P ≤ 0.020%, S ≤ 0.020%. Min yield 275 MPa (40 ksi). UNS J11872.

Typical service: Fossil fuel power plant main steam service, 371°C–510°C at Class 300–600; Refinery vacuum and atmospheric distillation - hot oil lines, 400–500°C; Industrial steam boiler headers and main steam isolation valves

Also designated:1.7706 - GX15CrMo1 (approximate) [EN / DIN]Group 1.9 [ASME B16.34]Grade B2 (approximate) [BS]SCPH 32 (approximate) [JIS]
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

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Need valves in Grade B2 / its ASTM equivalent?

We supply A217 WC11 (1¼Cr-½Mo) valves - the Grade B2 equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

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Engineering references

A217 WC11 (1¼Cr-½Mo) full grade pageWC11 Chrome-Moly Alloy SteelEquivalence MatrixAll 43 grades across 7 systemsDesignation lookup directoryEvery foreign designation indexed