ASTM A106 Grade C — Chemical Composition & Mechanical Properties
ASTM A106 Grade C is a carbon steel grade for seamless pipe (UNS K03501). It is also known as A106 C. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group supplies this grade as a stockist and supplier, and manufactures matching flanges and fittings.
ASTM A106 Grade C at a glance
| Specification | ASTM A106 Grade C |
|---|---|
| Material family | Carbon steel |
| Product form | Seamless pipe |
| UNS number | K03501 |
| Also known as | A106 C |
| Document | TG-MG-111 · Rev. 1 · October 2026 |
Typical service
Higher-strength high-temperature carbon steel pipe
Heat treatment
Hot finished or normalised
Chemical composition of ASTM A106 Grade C (weight %)
Other elements and limits: V 0.08 max
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 | 30 % |
| Hardness | Not specified |
About carbon steel
Carbon steel is iron with up to about 0.35 % carbon and 1–1.6 % manganese, and no deliberate chromium, nickel or molybdenum. It is the default material for piping in water, steam, oil, gas and general process service from about −29 °C up to roughly 425 °C.
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 A106 Grade C
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A106 Grade C · ASME SA-106 Grade C |
| USA — UNS | K03501 |
| Europe — EN designation | P265GH (EN 10216-2) |
| Europe — W.Nr | 1.0425 |
| Japan — JIS | STPT410 (JIS G3456) |
| China — GB / NB | 20MnG / 25MnG (GB/T 5310) |
| China — old GB designation | 20G |
| UK — BS (withdrawn) | BS 3602 HFS 410 |
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 A106 Grade C
All material standardsFAQ
ASTM A106 Grade C: common questions
What is the minimum yield strength of ASTM A106 Grade C?
275 MPa, with a minimum tensile strength of 485 MPa.
What is the carbon content of ASTM A106 Grade C?
0.35 max %.
How is ASTM A106 Grade C heat treated?
Hot finished or normalised.
What is the Chinese (GB) equivalent of ASTM A106 Grade C?
The nearest Chinese equivalent is 20MnG / 25MnG (GB/T 5310), formerly 20G. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A106 Grade C?
The nearest Japanese (JIS) equivalent is STPT410 (JIS G3456).
Does Teshi Group supply ASTM A106 Grade C?
Teshi Group supplies this grade as a stockist and supplier, and manufactures matching flanges and fittings. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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