What does WPB stand for?

WP indicates a wrought piping fitting and B is the carbon steel grade designation within ASTM A234.

Which standard controls A234 WPB fitting dimensions?

ASME B16.9 for factory-made buttwelding fittings.

Material specification

ASTM A234 WPB

Wrought Carbon Steel Buttwelding Fittings

ASTM A234 covers wrought carbon and alloy steel fittings for moderate and elevated temperature service. Grade WPB is the widely used carbon steel grade for buttweld fittings.

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Scope

What it covers

Buttweld elbows, tees, reducers and caps in carbon steel.
Grades include WPB for carbon steel and WP-series grades for alloy steels.
Dimensions of these fittings follow ASME B16.9.

Practical notes

Points to specify

A234 WPB is typically specified together with a B16.9 dimensional callout and a pipe schedule.
Alloy grades within A234 suit higher temperature service where specified by the designer.

Products quoted against ASTM A234 WPB

Pipe Fittings

View range

FAQ

Common questions about ASTM A234 WPB

What does WPB stand for?: WP indicates a wrought piping fitting and B is the carbon steel grade designation within ASTM A234.
Which standard controls A234 WPB fitting dimensions?: ASME B16.9 for factory-made buttwelding fittings.

More references

ASME B16.5

Pipe Flanges and Flanged Fittings (NPS 1/2 through NPS 24)

ASME B16.9

Factory-Made Wrought Buttwelding Fittings

ASME B16.11

Forged Fittings, Socket-Welding and Threaded

General guidance only. Work from the current published edition of the standard and your project specification; sizes, grades, classes and documentation are confirmed per enquiry.