A217 WC6
Data verifiedASTM A217 WC6 is the 1.25Cr-0.5Mo cast steel for high-temperature pressure castings — the cast counterpart of A387 Gr.11 plate and F11 forgings, standard for steam-service valve bodies and turbine castings to about 540 °C.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.05–0.20 |
| Si | ≤0.60 |
| Mn | 0.50–0.80 |
| P | ≤0.035 |
| S | ≤0.035 |
| Cr | 1.00–1.50 |
| Mo | 0.44–0.65 |
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); PWHT after weld repair per code and purchase spec.
Equivalent grades
| Standard | Designation |
|---|---|
| din | GX15CrMo5 (EN 10213, near) |
| aisi | A217 WC6 |
| jis | SCPH21 (near) |
| gb | ZG15Cr1Mo (near) |
Compare side by side: A217 WC6 vs A387 Gr.11
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Steam and process valve bodies, turbine casings, boiler and superheater castings, refinery hot-service fittings.
Processing: Weld with matching 1.25Cr-0.5Mo (B2-class) consumables, preheat and PWHT mandatory; castings supplied normalized and tempered.
FAQ
- WC6 or WC9 for a steam valve?
- WC6 (1.25Cr-0.5Mo) covers most steam duty to ~540 °C. WC9 (2.25Cr-1Mo) is chosen for higher temperatures and hydrogen service, matching F22/A387 Gr.22 piping systems.
Need A217 WC6 from stock?
Steel.Wiki is sponsored by Shenzhen NewAsia Special Steel (Nasteel), a special-steel stockholder in Shenzhen stocking mold, tool and alloy steels with EN 10204 3.1 certification.
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.