ASTM A217 C12 — Chemical Composition & Mechanical Properties
ASTM A217 C12 is a chrome-moly alloy steel grade for alloy steel castings (UNS J82090). It is also known as 9Cr-1Mo 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 C12 at a glance
| Specification | ASTM A217 C12 |
|---|---|
| Material family | Chrome-moly alloy steel |
| Product form | Alloy steel castings |
| UNS number | J82090 |
| Also known as | 9Cr-1Mo cast |
| Document | TG-MG-151 · Rev. 1 · October 2026 |
Typical service
9Cr-1Mo valve bodies
Heat treatment
Normalised and tempered 675 °C min
Chemical composition of ASTM A217 C12 (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 620 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 415 MPa |
| Elongation, min | 18 % |
| Tensile strength, max | 795 MPa |
| 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 C12
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A217 C12 · ASME SA-217 C12 |
| USA — UNS | J82090 |
| China — GB / NB | C12 (GB/T 12229) |
| UK — BS (withdrawn) | BS 1504-629 |
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 C12
All material standardsFAQ
ASTM A217 C12: common questions
What is the minimum yield strength of ASTM A217 C12?
415 MPa, with a minimum tensile strength of 620 MPa.
What is the carbon content of ASTM A217 C12?
0.20 max %.
How is ASTM A217 C12 heat treated?
Normalised and tempered 675 °C min.
What is the Chinese (GB) equivalent of ASTM A217 C12?
The nearest Chinese equivalent is C12 (GB/T 12229). Equivalents are close but not identical — compare chemistry and properties before substituting.
Does Teshi Group supply ASTM A217 C12?
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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