A234 WPB grade pipe fittings : Elbows | Tee | Cross | Caps | Reducers

carbon-steel-pipe-fittings-1280x868.jpg

A234 WPB is a grade specification for Buttweld Fittings manufactured from carbon steel and alloy steel. The term “WPB” stands for “wrought pressure vessel quality, grade B.” These fittings are used for pressure piping and for pressure vessel fabrication for service at moderate and elevated temperatures.

The ASTM A234 standard covers the following types of fittings:

  • Elbows (45°, 90°, and 180°)
  • Tees and Crosses
  • Reducers (concentric and eccentric)
  • Caps and Stub Ends
  • Special Fittings (made as per customer specifications)

The key characteristics of A234 WPB steel pipe fittings include:

  • Material Composition: They are made from carbon and alloy steel. The carbon steel may be further classified as per ASTM A 106 and ASTM A 53 or API 5L.
  • Resistance: They are resistant to moderate and high-temperature service, making them suitable for many industrial applications that require strength and resistance to stress.
  • Manufacturing Process: The manufacturing process of these pipe fittings involves shaping the material through a process of heating, then cooling. This process is known as “wrought” which means it’s forged or shaped.
  • Uses: They are used in various industrial applications including petrochemical, oil and gas, and power generation due to their strength, flexibility, and resistance to thermal and mechanical stress.

It’s important to note that these fittings must be matched with appropriate pipes in terms of material grade and dimensional specifications to ensure the integrity of the entire piping system. Also, while A234 WPB is a common material grade, other grades can be used based on the specific requirements of the application. ASTM A234 also includes other grades such as WP1, WP5, WP9, WP11, WP22, and more, each with different properties tailored to different applications.

When choosing a pipe fitting, it’s usually important to consider factors such as the material grade, pressure rating, temperature rating, and the application’s specific requirements.

W = WELDABLE / wrought

P = RELATED TO P NUMBER OF ALLOY MATERIAL

B = REFER TO MINIMUM YIELD OF MATERIAL

Chemical Composition (%) of ASTM A234/A234M fittings

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:

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.

Mechanical properties of ASTM A234

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]

 

ABTER STEEL

Headquarters

ABTER Steel prides itself in providing around the clock services to our customers.
+ 86-317-3736333

www.Lordtk.com

[email protected]


GET IN TOUCH

Follow our activity

In addition to our pipe & fittings stock, Cutting, Testing and Supplement Services, and to the above mentioned services, we also offer large/hard to find items in ….Flanges,Fittings,Tube / Pipe.