Views: 128 Author: Lucky Publish Time: 2023-03-17 Origin: Site
ASTM A234 is the standard specifification for piping syetem of wrought carbon steel and alloy steel for moderate and high temperature service.
ASTM A234 WPB is one of the common carbon steel grade and used to manufacture ASME B16.9 butt weld pipe fittings, such as 90 Degree Elbow, 45 Degree Elbow, Steel Pipe Bend, Tee, Cross, Conc Reducer, Ecc Reducer and Steel Pipe Cap
ASTM A234 WPB Specification
| Size Range | 1/2" to 36" ( Seamless) / 1" to 80" ( Welded) |
| Thickness Schedule | Sch 10, 20, 40, STD, XS, 60, 80, 100, 120, 140, 160, XXS or Customized |
| ASME Standard | ANSI / ASME B16.9, MSS SP 43 |
| JIS Standard | JIS B2311 / 2312 / 2313 |
| EN Standard | EN 10253 - 2 |
What is the Meaning of WPB - W / S
W = Weldable / Wrought.
P = Related to P Number of Alloy Material.
B = Refer to Minimum Yield of Materia.
W = Welded.
S = Seamless.
Difference between ASTM A234 WPB and ASTM A105
Manufacturing Process
A234 WPB: Wrought.
A105: Forging.
Product Type
A234 WPB: Butt Weld Pipe Fittings.
A105: Socket Weld Fittings and Threaded Fititngs.
Chemical of Mn
A234 WPB: 0.29 - 1.06.
A105: 0.6 - 1.05
Size for Fittings
A234 WPB: 1/2 to 80 Inch.
A105: 1/8 to 4 Inch.
Chemical Requirements for ASTM A234 WPB
When pipe fittings are of welded construction, the grade and marking symbol shown above shall be supplemented by letter “W”.
Fittings made from bar or plate may have 0.35 max carbon.
Fittings made from forgings may have 0.35 max carbon and 0.35 max silicon with no minimum.
For each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum will be permitted, up to amaximum of 1.35%.
The sum of Copper, Nickel, Chromium,and Molybdenum shall not exceed 1.00%.
The sum of Chromium and Molybdenum shall not exceed 0.32 %.
Mechanical Requirements for ASTM A234 WPB
Tensile strength ksi 【MPa】 60-95 [415-655]
Yield strength, min ksi [MPa] (0.2% offset or 0.5 % extension-under-load) 35 [240]
Elongation: Standard round specimen or small proportional specimen min % in 4
Rectangular specimen for wall thickness 5/16inch. [7.94 mm] and over,and for all small sizes tested in full section; min % in 2 in. [50 mm]
Rectangular specimen for wall thickness less than 5/16inch.【7.94 mm】；min% in 2 in.【50 mm】（1/2-in.【12.7-m m] wide specimen)
WPB pipe fittings manufactured from plate shall have a minimum elongation of 17 %.
For each 1/32inch.【0.79mm] decrease in wall thickness below 5/16 inch. [7.94 mm], a deduction of 1.5% for longitudinal and 1.0%for transverse from the values shown above is permitted.
ASTM A234 Carbon and Alloy Steel Grades
