ASTM A234 WPB is the Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service.
Forging is the manufacturing process of ASTM A234 WPB pipe fittings.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
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Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
Abstract …
The regular fittings of A234 WPB pipe fittings are elbows, tees, reducers, caps, cross.
Grade | Type | Chemical Composition (%) | ||||||||||||
C | Si | S | P | Mn | Cr | Ni | Mo | Other | ób | ós | δ5 | |||
WPB | 0.3 | 0.1min | 0.058 | 0.05 | 0.29-1.06 | 0.4 | 0.4 | 0.15 | V:0.06;Nb:0.02 | 415-585 | 240 | 22 | 197 | |
WPC | 0.35 | 0.1min | 0.058 | 0.05 | 0.29-1.06 | 0.4 | 0.4 | 0.15 | V:0.06;Nb:0.02 | 485-655 | 275 | 22 | 197 | |
WP1 | 0.28 | 0.1-0.5 | 0.045 | 0.045 | 0.3-0.9 | 0.44-0.65 | 380-550 | 205 | 22 | 197 | ||||
WP12 CL1 | 0.05-0.2 | 0.6 | 0.045 | 0.045 | 0.3-0.8 | 0.8-1.25 | 0.44-0.65 | 415-585 | 220 | 22 | 197 | |||
WP12 CL2 | 0.05-0.2 | 0.6 | 0.045 | 0.045 | 0.3-0.8 | 0.8-1.25 | 0.44-0.65 | 485-655 | 275 | 22 | 197 | |||
WP11 CL1 | 0.05-0.15 | 0.5-1 | 0.03 | 0.03 | 0.3-0.6 | 1-1.5 | 0.44-0.65 | 415-585 | 205 | 22 | 197 | |||
WP11 CL2 | 0.05-0.2 | 0.5-1 | 0.04 | 0.04 | 0.3-0.8 | 1-1.5 | 0.44-0.65 | 485-655 | 275 | 22 | 197 | |||
WP11 CL3 | 0.05-0.2 | 0.5-1 | 0.04 | 0.04 | 0.3-0.8 | 1-1.5 | 0.44-0.65 | 520-690 | 310 | 22 | 197 | |||
WP22 CL1 | 0.05-0.15 | 0.5 | 0.04 | 0.04 | 0.3-0.6 | 1.9-2.6 | 0.87-1.13 | 415-585 | 205 | 22 | 197 | |||
WP22 CL3 | 0.05-0.15 | 0.5 | 0.04 | 0.04 | 0.3-0.6 | 1.9-2.6 | 0.87-1.13 | 520-690 | 310 | 22 | 197 | |||
WP5 CL1 | 0.15 | 0.5 | 0.03 | 0.04 | 0.3-0.6 | 4-6 | 0.44-0.65 | 415-585 | 205 | 22 | 217 | |||
WP5 CL3 | 0.15 | 0.5 | 0.03 | 0.04 | 0.3-0.6 | 4-6 | 0.44-0.65 | 520-690 | 310 | 22 | 217 | |||
WP9 CL1 | 0.15 | 1 | 0.03 | 0.03 | 0.3-0.6 | 8-10 | 0.9-1.1 | 415-585 | 205 | 22 | 217 | |||
WP9 CL3 | 0.15 | 1 | 0.03 | 0.03 | 0.3-0.6 | 8-10 | 0.9-1.1 | 520-690 | 310 | 22 | 217 | |||
WPR | 0.2 | 0.05 | 0.045 | 0.4-1.06 | 1.6-2.24 | 435-605 | 315 | 22/28 | 217 | |||||
WP91 | 0.08-0.12 | 0.2-0.5 | 0.01 | 0.02 | 0.3-0.6 | 8-9.5 | 0.4 | 0.85-1.05 | See sdandard | 585-760 | 415 | 20 | 248 | |
WP911 | 0.09-0.13 | 0.1-0.5 | 0.01 | 0.02 | 0.3-0.6 | 8.5-10.5 | 0.4 | 0.9-1.1 | See sdandard | 620-840 | 440 | 20 | 248 |
Notes:
Tensile Requirements | WPB | WPC, WP11CL2 | WP11CL1 | WP11CL3 |
Tensile Strength, min, ksi[MPa] | 60-85 | 70-95 | 60-85 | 75-100 |
(0.2% offset or 0.5% extension-under-load) | [415-585] | [485-655] | [415-585] | [520-690] |
Yield Strength, min, ksi[MPa] | 32 | 40 | 30 | 45 |
[240] | [275] | [205] | [310] |
What is the manufacturing process of ASTM A234 WPB pipe fittings?
The WPB is not short hand for any process. It is simply an identifier developed by ASTM. The fittings in question are manufactured in the same manner as the companion pipe for this specification.In very large sizes, the fittings may be manufactured in pieces and welded together as is the case for many large fittings.
The term used for the manufacturing is called “wrought” which means it is worked as opposed to being cast or forged.
As to the W standing for weldable, I’m not sure that is correct since that are many, many pipe fittings that are weldable but carry designations other than a W. Note the reference below.
ASTM A234/A234M-07
Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
This standard covers wrought carbon steel fittings of seamless and welded construction which are manufactured to the dimensional specifications of ASME B16.9 and B16.28. These fittings are primarily for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures.
ASTM Standards
High-Temperature Service
ASME Standards
Even welding and smooth weld line, can be substitute for seamless tube after drawing and cold rolling.
This Standard covers overall dimensions, tolerances, ratings, testing, and markings for wrought factory-made buttwelding fittings in sizes NPS 1 ⁄ 2 through 48 (DN 15 through 1200).
Fittings may be made to special dimensions, sizes, shapes, and tolerances by agreement between the manufacturer and the purchaser.
There are different varieties of pipe fittings made of various materials and available in various shapes and sizes.
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