ASTM A234 WPB CAP SMLS BW END CAPS ASME B16.9 NACE MR 0175 Manufacturer
We are a trusted manufacturer and exporter of ASTM A234 WPB carbon steel pipe caps, offering seamless (SMLS) and butt-weld (BW) end caps conforming to ASME B16.9 standards. These fittings are widely used to seal pipe ends in high-pressure pipelines, oil & gas systems, power plants, and chemical industries.
What Is an ASTM A234 WPB Cap?
An ASTM A234 WPB cap (also known as a pipe end cap) is a butt-weld fitting used to close the end of a pipe, preventing flow or leakage.
Made from carbon steel grade WPB, it is suitable for moderate to high-temperature applications and offers excellent mechanical strength and weldability.
Available Types of BW Caps
-
Seamless (SMLS) Pipe Caps
-
Butt Weld (BW) End Caps
-
Large-diameter fabricated caps
-
Dished and hemispherical end caps
Size Range: ½” to 48” (DN15–DN1200)
Thickness: Schedule 10S to XXS
Standard: ASME B16.9 / MSS SP-75
ASTM A234 WPB Material Specification
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.30 |
| Manganese (Mn) | 0.29 – 1.06 |
| Phosphorus (P) | ≤ 0.050 |
| Sulfur (S) | ≤ 0.058 |
| Silicon (Si) | 0.10 – 0.35 |
Mechanical Properties:
-
Tensile Strength: ≥ 415 MPa
-
Yield Strength: ≥ 240 MPa
-
Elongation: ≥ 20%
-
Hardness: ≤ 197 HB
ASME B16.9 Buttwelding Steel Pipe Cap Dimensions
| NPS | O.D. D |
Lenght H |
Lenght H(1) |
WT |
| 1/2 | 21.3 | 25 | 25 | 4.57 |
| 3/4 | 26.7 | 25 | 25 | 3.81 |
| 1 | 33.4 | 38 | 38 | 4.57 |
| 1.1/4 | 42.2 | 38 | 38 | 4.83 |
| 1.1/2 | 48.3 | 38 | 38 | 5.08 |
| 2 | 60.3 | 38 | 44 | 5.59 |
| 2.1/2 | 73 | 38 | 51 | 7.11 |
| 3 | 88.9 | 51 | 64 | 7.62 |
| 3.1/2 | 101.6 | 64 | 76 | 8.13 |
| 4 | 114.3 | 64 | 76 | 8.64 |
| 5 | 141.3 | 76 | 89 | 9.65 |
| 6 | 168.3 | 89 | 102 | 10.92 |
| 8 | 219.1 | 102 | 127 | 12.70 |
| 10 | 273 | 127 | 152 | 12.70 |
| 12 | 323.8 | 152 | 178 | 12.70 |
| 14 | 355.6 | 165 | 191 | 12.70 |
| 16 | 406.4 | 178 | 203 | 12.70 |
| 18 | 457 | 203 | 229 | 12.70 |
| 20 | 508 | 229 | 254 | 12.70 |
| 22 | 559 | 254 | 254 | 12.70 |
| 24 | 610 | 267 | 305 | 12.70 |
| 26 | 660 | 267 | – | … |
| 28 | 711 | 267 | – | … |
| 30 | 762 | 267 | – | … |
| 32 | 813 | 267 | – | … |
| 34 | 864 | 237 | – | … |
| 36 | 914 | 267 | – | … |
| 38 | 965 | 305 | – | … |
| 40 | 1016 | 305 | – | … |
| 42 | 1067 | 305 | – | … |
| 44 | 1118 | 343 | – | … |
| 46 | 1168 | 343 | – | … |
| 48 | 1219 | 343 | – | … |
BW Caps Manufacturing Process
-
Seamless caps are made from hot-formed carbon steel pipes or plates.
-
Heat-treated (normalized or stress-relieved) for toughness and dimensional accuracy.
-
100% inspected for wall thickness, dimensions, and roundness.
Testing & Inspection
All ASTM A234 WPB caps undergo:
-
Visual & dimensional check
-
NDT tests: UT / RT / PT / MT
-
Hydrostatic test on request
-
Surface finish: Black, galvanized, or anti-rust oil coating
Applications of ASTM A234 WPB Caps
-
Pipeline closures and isolation systems
-
Oil, gas, and petrochemical plants
-
Boiler and pressure vessel systems
-
Power generation piping networks
Related Products
-
ASTM A234 WPB Elbows (45°, 90° LR / SR)
