ASTM A234 WPB — Chemical Composition & Mechanical Properties
ASTM A234 WPB is a carbon steel grade for wrought butt-weld fittings (UNS K03006, EN / W.Nr ≈ P235GH / P265GH). This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group manufactures flanges and fittings in this grade.
ASTM A234 WPB at a glance
| Specification | ASTM A234 WPB |
|---|---|
| Material family | Carbon steel |
| Product form | Wrought butt-weld fittings |
| UNS number | K03006 |
| EN / W.Nr equivalent | ≈ P235GH / P265GH |
| Also known as | WPB |
| Document | TG-MG-012 · Rev. 1 · October 2026 |
Typical service
General carbon-steel piping, moderate & high temperature
Heat treatment
Hot-formed (finished 620–980 °C) need not be heat treated; otherwise normalize, anneal or stress relieve
Chemical composition of ASTM A234 WPB (weight %)
Other elements and limits: V 0.08 max; Cu+Ni+Cr+Mo 1.00 max; Cr+Mo 0.32 max
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 415 MPa |
|---|---|
| Yield strength, min | 240 MPa |
| Elongation, min | 22 % |
| Hardness | 197 HBW |
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 A234 WPB
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A234 WPB · ASME SA-234 WPB |
| USA — UNS | K03006 |
| Europe — EN designation | P235GH / P265GH (EN 10253-2) |
| Europe — W.Nr | 1.0345 / 1.0425 |
| Japan — JIS | PG370 (JIS B2311) / PT370 (JIS B2312) |
| China — GB / NB | 20 (GB/T 12459) |
| China — old GB designation | 20 |
| UK — BS (withdrawn) | BS 1640 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Same alloy in other product forms
| Product form | Specification / grade |
|---|---|
| Seamless pipe | ASTM A106 Gr.B |
| Wrought butt-weld fittings | ASTM A420 WPL6 |
| Seamless & welded pipe | ASTM A333 Grade 6 |
Other carbon steel grades
Carbon steel overviewStandards for ASTM A234 WPB
All material standardsFAQ
ASTM A234 WPB: common questions
What is the minimum yield strength of ASTM A234 WPB?
240 MPa, with a minimum tensile strength of 415 MPa.
What is the carbon content of ASTM A234 WPB?
0.30 max %.
What is the UNS number and EN equivalent of ASTM A234 WPB?
UNS K03006; the nearest European designation is W.Nr ≈ P235GH / P265GH. Equivalents are close but not identical — check the specification if substituting.
How is ASTM A234 WPB heat treated?
Hot-formed (finished 620–980 °C) need not be heat treated; otherwise normalize, anneal or stress relieve.
What is the Chinese (GB) equivalent of ASTM A234 WPB?
The nearest Chinese equivalent is 20 (GB/T 12459), formerly 20. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A234 WPB?
The nearest Japanese (JIS) equivalent is PG370 (JIS B2311) / PT370 (JIS B2312).
Does Teshi Group supply ASTM A234 WPB?
Teshi Group manufactures flanges and fittings 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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