A217 WC9
Data verifiedASTM A217 WC9 is the 2.25Cr-1Mo cast steel — cast counterpart of A387 Gr.22 plate and F22 forgings — for the hottest, most hydrogen-rich valve and casing duty in refineries and power plants, to roughly 593 °C.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.05–0.18 |
| Si | ≤0.60 |
| Mn | 0.40–0.70 |
| P | ≤0.035 |
| S | ≤0.035 |
| Cr | 2.00–2.75 |
| Mo | 0.90–1.20 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Tensile strength | 485–655 MPa |
| Yield strength | ≥275 MPa |
| Elongation | ≥20% |
| Density | 7.85 g/cm³ |
Heat treatment
Normalized and tempered per ASTM A217 (temper ≥595 °C); full PWHT after welding.
Equivalent grades
| Standard | Designation |
|---|---|
| din | GX17CrMoV5-11 type (near) |
| aisi | A217 WC9 |
| jis | SCPH22 (near) |
| gb | ZG12Cr2Mo1 (near) |
Compare side by side: A217 WC9 vs A387 Gr.22
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: High-temperature steam valves, hydroprocessing reactor fittings, turbine and boiler castings, hot hydrogen service.
Processing: Strict practice: B3-class Cr-Mo consumables, controlled preheat/interpass, dehydrogenation and PWHT. Temper-embrittlement awareness for long high-temperature exposure.
FAQ
- WC9 vs C12A for high-temperature castings?
- C12A (9Cr-1Mo-V) serves the ultrasupercritical power grades above WC9’s practical limit (~593 °C). WC9 remains the refinery standard paired with Gr.22 systems.
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Ask for a quotationVisit NasteelSource: ASTM A217 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.