Views: 132 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 %.
Grade | Composition,% | ||||||
C | Mn | P | S | Si | Cr Mo | ||
WPB | 0.30 max | 0.29-1.06 | 0.050 | 0.058 | 0.10 min | 0.40 max | 0.15max |
WPC | 0.35 max | 0.29-1.06 | 0.050 | 0.058 | 0.10 min | 0.40 max | 0.15 max |
WP1 | 0.28 max | 0.30-0.90 | 0.045 | 0.045 | 0.10-0.50 | 0.44-0.65 | |
WP12 CL1, | 0.05-0.20 | 0.30-0.80 | 0.045 | 0.045 | 0.60 max | 0.80-1.25 | 0.44-0.65 |
WP11 CL1 | 0.05-0.15 | 0.30-0.60 | 0.030 | 0.030 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
WP11 CL2, | 0.05-0.20 | 0.30-0.80 | 0.040 | 0.040 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
WP22 CL1 | 0.05-0.15 | 0.30-0.60 | 0.040 | 0.040 | 0.50 max | 1.90-2.60 | 0.87-1.13 |
WP5 CL1, | 0.15 max | 0.30-0.60 | 0.040 | 0.030 | 0.50 max | 4.0-6.0 | 0.44-0.65 |
WP9 CL1, | 0.15 max | 0.30-0.60 | 0.030 | 0.030 | 1.00 max | 8.0-10.0 | 0.90-1.10 |
WPR | 0.20 max | 0.40-1.06 | 0.045 | 0.050 | |||
WP91 | 0.08-0.12 | 0.30-0.60 | 0.020 | 0.010 | 0.20-0.50 | 8.0-9.5 | 0.85-1.05 |
WP911 | 0.09-0.13 | 0.30-0.60 | 0.020 | 0.010 | 0.10-0.50 | 8.5-9.5 | 0.90-1.10 |
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.
Grade and Marking Symbol | WPB | WPC, | WP1 | WP11 CL1, | WPR | WP11 CL3, | WP91 | WP911 | WP12 CL1 | |
Tensile strength | 60-95 | 70-95 | 55-80 | 60-85 | 63-88 | 75-100 | 85-100 | 90-120 | 60-85 | |
Yield strength, | 35 | 40 | 30 | 30 | 46 | 45 | 60 | 64 | 32 | |
ASTM A234 Carbon and Alloy Steel Grades
Grade | Class | Construction | Mandatory Marking |
WPB | W(Welded construction) | WPBWA | |
S (Seamless construction) | WPB | ||
WPC | W(Welded construction) | WPCWA | |
S (Seamless construction) | WPC | ||
WP1 | W(Welded construction) | WP1WA | |
S (Seamless construction) | WP1 | ||
WP12 | CL1 | W(Welded construction) | WR12 CL1WA |
S (Seamlessconstruction) | WP12 CL1 | ||
CL2 | W(Welded construction) | WP12 CL2WA | |
S(Seamless construction) | WP12 CL2 | ||
WP11 | CL1 | W(Welded construction) | WP11 CL1WA |
S(Seamless construction) | WP11 CL1 | ||
CL2 | W(Welded construction) | WP11 CL2WA | |
S(Seamless construction) | WP11 CL2 | ||
CL3 | W(Welded construction) | WP11 CL3WA | |
S(Seamless construction) | WP11 CL2 | ||
WP22 | CL1 | W(Welded construction) | WP22 CL1WA |
S(Seamless construction) | WP22 CL1 | ||
CL3 | W(Welded construction) | WP22 CL3WA | |
S(Seamless construction) | WP22 CL3 | ||
WP5 | CL1 | W(Welded construction) | WP5 CL1WA |
S(Seamless construction) | WP5 CL1 | ||
CL3 | W(Welded construction) | WP5 CL3 WA | |
S(Seamless construction) | WP5 CL3 | ||
WP9 | CL1 | W(Welded construction) | WP9 CL1 WA |
S(Seamless construction) | WP9 CL1 | ||
CL3 | W(Welded construction) | WP9 CL3WA | |
S(Seamless construction) | WP9 CL3 | ||
WPR | W(Welded construction) | WPRWA | |
S(Seamless construction) | WPR | ||
WP91 | W(Welded construction) | WP91WA | |
S(Seamless construction) | WP91 |
Application Scope of ASTM A234 WPB Pipe Fittings
Oil and Gas Industry
In the process of oil and gas extraction and transportation, a large number of pipelines are required to transport crude oil, natural gas and other media. ASTM A234 WPB pipe fittings are often used to connect these pipelines due to their good strength and corrosion resistance.
In long-distance oil and gas pipelines, WPB pipe fittings can withstand high pressure and temperature to ensure the safe operation of the pipeline system.
Power industry
In thermal power plants, steam is the main source of power. WPB pipe fittings are used to connect steam pipes between major equipment such as boilers, turbines, generators, etc., and withstand high temperature and high pressure steam.
In nuclear power plants, the safety and reliability of the pipeline system are extremely high. ASTM A234 WPB pipe fittings are used in the primary and secondary loop pipeline systems of nuclear power plants due to their good quality and performance.
Chemical Industry
In the chemical production process, various corrosive media such as acids, alkalis, salts, etc. need to be transported in pipelines. WPB pipe fittings have certain corrosion resistance and can meet the requirements of chemical production.
In the process of storage and transportation of chemical products, various pipes and fittings are needed to connect storage tanks, loading and unloading equipment, etc. WPB pipe fittings are widely used in chemical storage and transportation systems due to their good sealing performance and strength.
