ASTM A234
Carbon and alloy steel piping fittings for moderate and high temperature
Covers carbon and alloy steel wrought piping fittings for moderate and high temperature service — WPB for carbon steel and WP11, WP22 and others for chrome-moly.
- Pipe fittings
- ASME SA-234
- 3 grades supplied to it
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASTM A234?
ASTM A234 is the specification for wrought carbon steel and alloy steel pipe fittings for moderate and high-temperature service. WPB is the carbon steel grade matched with ASTM A106 Gr B pipe; WP11, WP22, WP5 and WP9 are the chrome-moly grades matched with ASTM A335 pipe. Dimensions follow ASME B16.9. ASME adopts it as SA-234.
ASTM A234 at a glance
| Products | Wrought buttweld fittings — elbows, tees, reducers, caps |
|---|---|
| Material | Carbon steel (WPB, WPC) and Cr-Mo alloy steel (WP11, WP22, WP5, WP9, WP91) |
| Dimensions | ASME B16.9 |
| ASME designation | SA-234 |
How to write ASTM A234 on a purchase order
Name the product, size, material specification and grade, the dimensional standard and the certificate. An example line:
Illustrative only — sizes, tests, inspection level and any project values come from your purchase specification.
ASTM A234 edition and verification status
Which edition we have confirmed, and what is still being checked before any numerical requirement is published here.
| Current edition | Not yet confirmed against the publisher listing |
|---|---|
| Full-text verification | In progress — numerical requirements are not published on this page |
| Edition on your order | The edition named in your purchase order or design code governs — confirm it with your enquiry |
What to know before ordering to ASTM A234
The points that decide whether material to ASTM A234 is accepted at inspection.
- WPB matches A106 B pipe; WP11 and WP22 match P11 and P22.
- Dimensions follow ASME B16.9 or B16.11.
- Welded (WP-W) fittings require radiography or ultrasonic examination of the welds made by the fitting manufacturer.
Grades and products we supply to ASTM A234
| Grade | Product | Designation on the certificate |
|---|---|---|
| ASTM A106 Gr B | Fittings | ASTM A234 WPB |
| ASTM A335 P11 | Fittings | ASTM A234 WP11 |
| ASTM A335 P22 | Fittings | ASTM A234 WP22 |
How ASTM A234 fits into an order
A purchase order line is only complete when it names the material standard, the dimensional standard and the inspection document. Miss one and the mill, the inspector and the buyer can each read the order differently.
Standards used with ASTM A234
Same family
ASTM A234 — questions buyers ask
What is ASTM A234?
ASTM A234 is the specification for wrought carbon steel and alloy steel pipe fittings for moderate and high-temperature service. WPB is the carbon steel grade matched with ASTM A106 Gr B pipe; WP11, WP22, WP5 and WP9 are the chrome-moly grades matched with ASTM A335 pipe. Dimensions follow ASME B16.9. ASME adopts it as SA-234.
What does WP stand for in A234?
"Wrought pipe" fitting — the prefix identifies a wrought fitting grade.
Which pipe goes with WPB fittings?
ASTM A106 Gr B (or A53 Gr B) carbon steel pipe; this pairing is standard industry practice.
What is the low-temperature equivalent of WPB?
ASTM A420 WPL6, impact tested at −46 °C, used with A333 Gr 6 pipe.
Which grades do you supply to ASTM A234?
ASTM A106 Gr B, ASTM A335 P11, ASTM A335 P22 — see the table on this page for the exact product and designation.
What is the difference between ASTM A234 and ASME SA-234?
ASME SA-234 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM A234. The technical requirements are usually identical to a specific ASTM edition; pressure-equipment codes call for the ASME designation, and most mill certificates show both.
Do you supply certificates to this standard?
Yes. Material is supplied with mill test certificates to EN 10204 3.1 showing the standard, grade and heat number; 3.2 with third-party inspection on request.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026