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ASTM A234 WPB Reducer

ASTM A234 WPB Reducer Specifications

Material Grades

  • ASTM A234 WPB
  • ASME SA234 WPB
  • Carbon Steel
  • Wrought Carbon Steel
  • Pressure Vessel Quality Carbon Steel

Reducer Types

  • Concentric Reducer
  • Eccentric Reducer
  • Butt Weld Reducer
  • Seamless Reducer
  • Welded Reducer
  • Custom Reducer

Manufacturing Method

  • Hot Forming
  • Cold Forming
  • Seamless Construction
  • Welded Construction
  • Butt Weld Construction
  • Custom Manufacturing

Reducer Testing

  • Dimensional Inspection
  • Visual Inspection
  • Hardness Testing
  • Tensile Testing
  • Hydrostatic Testing
  • Ultrasonic Testing
  • Radiographic Testing

Manufacturing Standards

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

Reducer Sizes

  • Size: 1/2" – 48"
  • Schedule: 5S – 160
  • Pressure Class: 150# – 2500#
  • End Connection: Butt Weld
  • Concentric & Eccentric
  • Custom Sizes Available

ASTM A234 WPB Reducer Dimensions Chart

Big End NPS Small End NPS Big End O.D. (mm) Small End O.D. (mm) Big End Thickness (mm) Small End Thickness (mm) Length H (mm)
3/4" 1/2" 26.9 21.3 2.3 2.0 38
1" 1/2" 33.7 21.3 2.6 2.0 50
1" 3/4" 33.7 26.9 2.6 2.3 50
1 1/4" 1/2" 42.4 21.3 2.6 2.0 50
1 1/4" 3/4" 42.4 26.9 2.6 2.3 50
1 1/4" 1" 42.4 33.7 2.6 2.6 50
1 1/2" 1/2" 48.3 21.3 2.6 2.0 64
1 1/2" 3/4" 48.3 26.9 2.6 2.3 64
1 1/2" 1" 48.3 33.7 2.6 2.6 64
1 1/2" 1 1/4" 48.3 42.4 2.6 2.6 64
2" 3/4" 60.3 26.9 2.9 2.3 76
2" 1" 60.3 33.7 2.9 2.6 76
2" 1 1/4" 60.3 42.4 2.9 2.6 76
2" 1 1/2" 60.3 48.3 2.9 2.6 76
2 1/2" 1" 76.1 33.7 2.9 2.6 90
2 1/2" 1 1/4" 76.1 42.4 2.9 2.6 90
2 1/2" 1 1/2" 76.1 48.3 2.9 2.6 90
2 1/2" 2" 76.1 60.3 2.9 2.6 90
3" 1 1/4" 88.9 42.4 3.2 2.6 90
3" 1 1/2" 88.9 48.3 3.2 2.6 90
3" 2" 88.9 60.3 3.2 2.9 90
3" 2 1/2" 88.9 76.1 3.2 2.9 90
4" 1 1/2" 114.3 48.3 3.6 2.6 100
4" 2" 114.3 60.3 3.6 2.9 100
4" 2 1/2" 114.3 76.1 3.6 2.9 100
4" 3" 114.3 88.9 3.6 3.2 100
5" 2" 139.7 60.3 4.0 2.9 127
5" 2 1/2" 139.7 76.1 4.0 2.9 127
5" 3" 139.7 88.9 4.0 3.2 127
5" 4" 139.7 114.3 4.0 3.6 127
6" 2 1/2" 168.3 76.1 4.5 2.9 140
6" 3" 168.3 88.9 4.5 3.2 140
6" 4" 168.3 114.3 4.5 3.6 140
6" 5" 168.3 139.7 4.5 4.0 140
8" 4" 219.1 114.3 6.3 3.6 152
8" 5" 219.1 139.7 6.3 4.0 152
8" 6" 219.1 168.3 6.3 4.5 152
10" 4" 273.0 114.3 6.3 3.6 178
10" 5" 273.0 139.7 6.3 4.0 178
10" 6" 273.0 168.3 6.3 4.5 178
10" 8" 273.0 219.1 6.3 6.3 178
12" 6" 323.9 168.3 7.1 4.5 203
12" 8" 323.9 219.1 7.1 6.3 203
12" 10" 323.9 273.0 7.1 6.3 203

ASTM A234 WPB Reducer Weight Chart

Big End NPS Small End NPS Height H (mm) Theoretical Weight (kg)
3/4"1/2"380.08
1"1/2"500.09
1"3/4"500.09
1 1/4"1/2"500.12
1 1/4"3/4"500.13
1 1/4"1"500.14
1 1/2"1/2"640.18
1 1/2"3/4"640.19
1 1/2"1"640.20
1 1/2"1 1/4"640.20
2"3/4"760.30
2"1"760.31
2"1 1/4"760.32
2"1 1/2"760.33
2 1/2"1"900.40
2 1/2"1 1/4"900.47
2 1/2"1 1/2"900.48
2 1/2"2"900.49
3"1 1/4"900.55
3"1 1/2"900.61
3"2"900.62
3"2 1/2"900.63
4"1 1/2"1000.85
4"2"1000.98
4"2 1/2"1001.00
4"3"1001.02
5"2"1271.60
5"2 1/2"1271.70
5"3"1271.74
5"4"1271.76
6"2 1/2"1402.60
6"3"1402.70
6"4"1402.82
6"5"1402.94
8"4"1525.03
8"5"1525.12
8"6"1525.18
10"4"1787.00
10"5"1787.20
10"6"1787.40
10"8"1787.55
12"6"20311.00
12"8"20311.10
12"10"20311.20

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
Pipe Equivalent: ASTM A53 Grade B
API Equivalent: API 5L Grade B
Forged Steel Equivalent: ASTM A105
Valve Equivalent: ASTM A216 Grade WCB

Mechanical Performance

415
MPa (60 KSI) minimum
Tensile Strength
240
MPa (35 KSI) minimum
Yield Strength
415–655
MPa
Tensile Strength Range
197
HB maximum
Hardness


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.