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ASTM A234 WPB Pipe Cap

ASTM A234 WPB Pipe Cap Specifications

Material Grades

  • ASTM A234 WPB
  • ASME SA234 WPB
  • Carbon Steel
  • Buttweld Pipe Cap

Pipe Cap Types

  • Round End Cap
  • Square Cap
  • Oval End Cap
  • U Shape Cap
  • Buttweld Cap
  • Large Bore Cap

Manufacturing Method

  • Seamless
  • Buttweld
  • Hot Formed
  • Cold Formed
  • Beveled Ends

Testing

  • Visual Inspection
  • Dimensional Inspection
  • Hydrostatic Testing
  • NDT Testing
  • Material Testing

Manufacturing Standards

  • ASME B16.9
  • ANSI B16.28
  • MSS-SP-43 Type A
  • MSS-SP-43 Type B
  • JIS B2312
  • JIS B2313

Sizes & Pressure

  • Size: NPS 1/2" to 48"
  • Pressure Rating: 150# to 2500#
  • Schedule: 20S to XXS
  • JIS, NPT, ISO, DIN, EN

ASTM A234 WPB Pipe Cap Dimensions Chart

NPS DN Outside Diameter D (mm) Height E (mm)
1/21521.3425.40
3/42026.6731.75
12533.4038.10
1 1/43242.1638.10
1 1/24048.2638.10
25060.3238.10
2 1/26573.0238.10
38088.9050.80
3 1/290101.6063.50
4100114.3063.50
5125141.3076.20
6150168.2788.90
8200219.07101.60
10250273.05127.00
12300323.85152.40
14350355.60165.10
16400406.40177.80
18450457.20203.20
20500508.00228.60
22550558.80254.00
24600609.60266.70
28700711.20266.70

ASTM A234 WPB Pipe Cap Weight Chart

NPS STD (kg) XS (kg) SCH 160 (kg) XXS (kg)
10.090.140.180.23
1 1/40.140.180.230.34
1 1/20.180.230.270.41
20.270.340.570.68
2 1/20.410.450.791.13
30.680.791.321.81
3 1/20.911.13–2.72
41.131.362.683.40
52.042.494.545.44
62.954.086.808.16
85.447.2614.0613.61
109.0711.3425.85–
1213.6116.3343.09–
1416.3320.41––
1618.1424.49––
1824.4932.66––
2034.0239.01––
2242.6456.70––
2443.5458.97––
2653.9872.12––
3078.02103.87––

Chemical Composition

Carbon (C)
0.30% Max
Manganese (Mn)
0.29–1.06%
Phosphorus (P)
0.05% Max
Sulfur (S)
0.058% Max
Silicon (Si)
0.10% Min
Chromium (Cr)
0.40% Max
Molybdenum (Mo)
0.15% Max
Nickel (Ni)
0.40% Max
Copper (Cu)
0.40% Max
Vanadium (V)
0.08% Max
Niobium (Nb)
0.02% Max
ASTM / ASME ASTM A234 WPB / ASME SA234 WPB
Pipe Equivalent ASTM A106 Grade B
Flange Equivalent ASTM A105
Valve Equivalent ASTM A216 Grade WCB
Bolting Equivalent ASTM A193 Grade B7 / ASTM A194 Grade 2H

Mechanical Performance

585
MPa
Tensile Strength
240
MPa
Yield Strength
415–655
MPa
Typical Tensile Range
197
HB Max
Hardness
150–2500
Class
Pressure Rating
550
°F / 288°C
Maximum Listed Temperature


MANUFACTURING

Forging Process

Each flange follows a rigorous 8-step forging and quality-control process to ensure conformance with ASTM A182 and ASME standards.

1

Material Selection

Prime 304 stainless steel billet sourced and certified.

2

Billet Preparation

Heat to 1100°C – 1250°C for optimal forgeability.

3

Forging

Shape billet into flange geometry under controlled pressure.

4

Heat Treatment

Solution anneal at 1040°C – 1120°C, then quench.

5

Machining & Finishing

CNC machining, drilling, and surface finishing.

6

Testing & Inspection

Tensile, hardness, PMI, visual and impact tests performed.