A234 WPB Butt-Weld Fittings to ASME B16.9
Our ASME B16.9 fittings are made in A234 WPB, the reference carbon grade for pressure piping, from ½" to 12" in STD and XS walls.
A234 WPB properties
| Property | A234 WPB |
|---|---|
| Minimum yield strength | 240 MPa |
| Tensile strength | 415 – 585 MPa |
| Maximum carbon | 0.30% |
| Fitting standard | ASME B16.9 |
ASTM A234 values for grade WPB.
ASTM A234 covers wrought carbon and alloy steel fittings for pressure piping and pressure vessel fabrication, for service at moderate and elevated temperatures. WPB is its most common carbon grade; it is welded to carbon steel pipe of matching grade.
Our A234 WPB range
| NPS | OD (mm) | STD | XS | Sch 40 | Sch 80 |
|---|---|---|---|---|---|
| ½" | 21.3 | 2.77 | 3.73 | 2.77 | 3.73 |
| ¾" | 26.7 | 2.87 | 3.91 | 2.87 | 3.91 |
| 1" | 33.4 | 3.38 | 4.55 | 3.38 | 4.55 |
| 1¼" | 42.2 | 3.56 | 4.85 | 3.56 | 4.85 |
| 1½" | 48.3 | 3.68 | 5.08 | 3.68 | 5.08 |
| 2" | 60.3 | 3.91 | 5.54 | 3.91 | 5.54 |
| 2½" | 73.0 | 5.16 | 7.01 | 5.16 | 7.01 |
| 3" | 88.9 | 5.49 | 7.62 | 5.49 | 7.62 |
| 4" | 114.3 | 6.02 | 8.56 | 6.02 | 8.56 |
| 5" | 141.3 | 6.55 | 9.53 | 6.55 | 9.53 |
| 6" | 168.3 | 7.11 | 10.97 | 7.11 | 10.97 |
| 8" | 219.1 | 8.18 | 12.70 | 8.18 | 12.70 |
| 10" | 273.0 | 9.27 | 12.70 | 9.27 | 15.09 |
| 12" | 323.8 | 9.53 | 12.70 | 10.31 | 17.48 |
Wall thickness in mm to ASME B36.10M. In bold: sizes where Sch 40 and STD, or Sch 80 and XS, no longer match.
All our A234 WPB fittings are seamless and delivered painted, in STD and XS walls.
A234 WPB or S235?
A234 WPB goes with ASME B16.9 and pressure piping; S235 goes with EN 10253-1 and general uses, with a galvanized option. The choice usually follows the standard of the pipe and the project.
Frequently asked questions
What does WPB mean?
W for wrought, P for pressure, B for the strength grade, comparable to grade B carbon steel pipe.
Are your A234 WPB fittings certified?
They come with an EN 10204 3.1 certificate; the plant is ISO 9001:2015 certified and product conformity is certified by Bureau Veritas.