ASTM A234 A234M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

pipe fittings materials data

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ASTM A234 WPB is the Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service.

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.

ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

Abstract …

Chemical Composition (%) of ASTM A234/A234M fittings

GradeTypeChemical Composition (%)
CSiSPMnCrNiMoOtheróbósδ5
WPB0.30.1min0.0580.050.29-1.060.40.40.15V:0.06;Nb:0.02415-58524022197
WPC0.350.1min0.0580.050.29-1.060.40.40.15V:0.06;Nb:0.02485-65527522197
WP10.280.1-0.50.0450.0450.3-0.90.44-0.65380-55020522197
WP12 CL10.05-0.20.60.0450.0450.3-0.80.8-1.250.44-0.65415-58522022197
WP12 CL20.05-0.20.60.0450.0450.3-0.80.8-1.250.44-0.65485-65527522197
WP11 CL10.05-0.150.5-10.030.030.3-0.61-1.50.44-0.65415-58520522197
WP11 CL20.05-0.20.5-10.040.040.3-0.81-1.50.44-0.65485-65527522197
WP11 CL30.05-0.20.5-10.040.040.3-0.81-1.50.44-0.65520-69031022197
WP22 CL10.05-0.150.50.040.040.3-0.61.9-2.60.87-1.13415-58520522197
WP22 CL30.05-0.150.50.040.040.3-0.61.9-2.60.87-1.13520-69031022197
WP5 CL10.150.50.030.040.3-0.64-60.44-0.65415-58520522217
WP5 CL30.150.50.030.040.3-0.64-60.44-0.65520-69031022217
WP9 CL10.1510.030.030.3-0.68-100.9-1.1415-58520522217
WP9 CL30.1510.030.030.3-0.68-100.9-1.1520-69031022217
WPR0.20.050.0450.4-1.061.6-2.24435-60531522/28217
WP910.08-0.120.2-0.50.010.020.3-0.68-9.50.40.85-1.05See sdandard585-76041520248
WP9110.09-0.130.1-0.50.010.020.3-0.68.5-10.50.40.9-1.1See sdandard620-84044020248

Notes:

 

Mechanical properties of ASTM A234

Tensile RequirementsWPBWPC, WP11CL2WP11CL1WP11CL3
Tensile Strength, min, ksi[MPa]60-8570-9560-8575-100
(0.2% offset or 0.5% extension-under-load)[415-585][485-655][415-585][520-690]
Yield Strength, min, ksi[MPa]32403045
[240][275][205][310]

What is the manufacturing process of ASTM A234 WPB pipe fittings?

 

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.

Forging is the manufacturing process of ASTM A234 WPB pipe fittings.

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.

 

Referenced Documents

ASTM Standards

High-Temperature Service

ASME Standards

This specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction. These fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures. The material for fittings shall consist of killed steel, forgings, bars, plates, seamless or fusion-welded tubular products with filler metal added. Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of two or more of these operations. The forming procedure shall be so applied that it will not produce injurious imperfections in the fittings. Fittings, after forming at an elevated temperature, shall be cooled to a temperature below the critical range under suitable conditions to prevent injurious defects caused by too rapid cooling, but in no case more rapidly than the cooling rate in still air. The fittings shall be subjected to tension test, hardness test, and hydrostatic test.

  • For each reduction of 0.01% below the specified C maximum, an increase of 0.06% Mn above the specified maximum will be permitted, up to a maximum of 1.35%.
  • The sum of Cu, Ni, Cr, and Mo shall not exceed 1.00%.
  • The sum of Cr and Mo shall not exceed 0.32%.
  • The maximum carbon equivalent (C.E.) shall be 0.50, based on heat analysis and the formula C.E.=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.

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.

    • W = WELDABLE / wrought
    • P = RELATED TO P NUMBER OF ALLOY MATERIAL
    • B = REFER TO MINIMUM YIELD OF MATERIAL
    • A216/A216M Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service
    • A217/A217M Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for
    • A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings
    • B16.11 Forged Steel Fittings, Socket Welding and Threaded
    • ASME Boiler and Pressure Vessel Code
    • SectionIX Welding Qualifications

C&N Huitong group can produce pipe fittings of such materials :

ASTM Standard MaterialASTM A53 A53M Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A106 A106M Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
API 5L Specification for Line Pipe
ASTM A213 2018 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A312 A312M Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
ASTM A234 A234M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
ASTM A403 A403M Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
ASTM A420 A420M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
ASTM A860 A860M Standard Specification for Wrought High-Strength Low-Alloy Steel Butt-Welding Fittings
ASTM A733 Standard Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples
DIN Standard MaterialDIN1629 Seamless Circular Unalloyed Steel Tubes Subject to special requirements
DIN 2440 Medium-weight threaded steel tubes
DIN 2441 Steel Tubes Heavy Weight For Suitable For Screwing
GOST Standard MaterialGOST-1050 Sized Bars Made of High-Quality Structural Carbon Steel With a Special Surface Finish
GOST 8732 Seamless hot-deformed steel pipes-Range of sizes
GOST 19281 Rolled Steel With Enhanced Strength
JIS Standard MaterialJIS G3452 Carbon steel pipes for ordinary piping
JIS G3454 Carbon steel pipes for pressure service
JIS G3455 Carbon steel pipes for high pressure service
JIS G3456 Carbon steel pipes for high temperature service
JIS G3457 Arc welded carbon steel pipes
JIS G3458 Alloy Steel Pipes
JIS G3459 Stainless steel pipes
JIS G3460 Steel pipes for low temperature service
BS EN Standard MaterialBS EN 10255 Non-alloy steel tubes suitable for welding and threading Technical delivery conditions
BS EN 10253-1 Butt-Welding Pipe Fittings  Part 1: Wrought Carbon Steel for General Use and Without Specific Inspection Requirements
BS EN 10253-2 Butt-welding pipe fittings. part 2: Non alloy ferritic alloy steels with specific inspection requirements
BS EN10253-3 Butt-welding pipe fittings Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements
BS EN 10253-4 Butt-welding pipe fittings Part 4:Wrought austenitic and austenitic-ferritic (duplex)stainless steels with specific inspection requirements