ASTM A217 WC6 — Chemical Composition & Mechanical Properties
ASTM A217 WC6 is a chrome-moly alloy steel grade for alloy steel castings (UNS J12072, EN / W.Nr ≈ 1.7357). It is also known as 1¼Cr-½Mo cast. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group manufactures valves with bodies in this grade.
ASTM A217 WC6 at a glance
| Specification | ASTM A217 WC6 |
|---|---|
| Material family | Chrome-moly alloy steel |
| Product form | Alloy steel castings |
| UNS number | J12072 |
| EN / W.Nr equivalent | ≈ 1.7357 |
| Also known as | 1¼Cr-½Mo cast |
| Document | TG-MG-122 · Rev. 1 · October 2026 |
Typical service
High-temperature valve bodies (1¼Cr-½Mo)
Heat treatment
Normalised and tempered 595 °C min
Chemical composition of ASTM A217 WC6 (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 485 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 275 MPa |
| Elongation, min | 20 % |
| Hardness | Not specified |
About chrome-moly alloy steel
Chrome-moly steels are low-alloy steels with 1–9 % chromium and 0.5–1 % molybdenum. Chromium gives oxidation and sulphidation resistance; molybdenum gives creep strength at high temperature. They are the standard choice for steam and hot hydrocarbon service above the carbon-steel range.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
International equivalents of ASTM A217 WC6
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A217 WC6 · ASME SA-217 WC6 |
| USA — UNS | J12072 |
| Europe — EN designation | G17CrMo5-5 (EN 10213) |
| Europe — W.Nr | 1.7357 |
| Japan — JIS | SCPH21 (JIS G5151) |
| China — GB / NB | WC6 (GB/T 12229) / ZG15Cr1Mo |
| China — old GB designation | ZG20CrMo |
| UK — BS (withdrawn) | BS 1504-621 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Standards for ASTM A217 WC6
All material standardsFAQ
ASTM A217 WC6: common questions
What is the minimum yield strength of ASTM A217 WC6?
275 MPa, with a minimum tensile strength of 485 MPa.
What is the carbon content of ASTM A217 WC6?
0.05–0.20 %.
What is the UNS number and EN equivalent of ASTM A217 WC6?
UNS J12072; the nearest European designation is W.Nr ≈ 1.7357. Equivalents are close but not identical — check the specification if substituting.
How is ASTM A217 WC6 heat treated?
Normalised and tempered 595 °C min.
What is the Chinese (GB) equivalent of ASTM A217 WC6?
The nearest Chinese equivalent is WC6 (GB/T 12229) / ZG15Cr1Mo, formerly ZG20CrMo. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A217 WC6?
The nearest Japanese (JIS) equivalent is SCPH21 (JIS G5151).
Does Teshi Group supply ASTM A217 WC6?
Teshi Group manufactures valves with bodies in this grade. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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