Seamless Carbon Steel Butt-Weld Pipe Fittings, A234 WPB Elbow For Pressure Piping ASME B16.9
Seamless Carbon Steel Butt-Weld Pipe Fittings, A234 WPB Elbow For Pressure Piping ASME B16.9
Overwiew of ASTM A234 WPB-S Elbow
An A234 WPB Elbow is a standard carbon steel butt‑weld pipe fitting used to change flow direction in pressure piping systems.ASTM A234 is the global specification for wrought carbon and alloy steel fittings for moderate and high‑temperature service. WPB denotes the material grade: W = wrought (forged/formed, not cast), P = pressure‑rating, B = carbon steel equivalent to A106 Grade B.
This elbow is manufactured to ASME B16.9, typically in 45° and 90° angles, with long radius (LR, 1.5D) as standard. It connects by welding to pipe ends, suitable for NPS ½” to 48”, various schedules (SCH 40, SCH 80, XS).
Widely used in oil, gas, power, chemical, and industrial piping, it offers good strength and weldability from −29°C up to approximately 425°C. It is the most common carbon steel elbow for general‑purpose pressure systems.
Advantages of ASTM A234 WPB‑S Elbow
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Seamless structure: No weld seam, higher pressure resistance.
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Good strength & toughness: Stable at medium/high temperature.
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Excellent weldability: Easy to install with carbon steel pipes.
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Wide compatibility: Matches A106 Gr.B, A105, 20#, P265GH.
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Cost‑effective: Reliable performance with reasonable price.
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Standardized: ASME B16.9, widely available globally.
Chemical Composition of ASTM A234 WPB-S Elbow
| Element | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | V |
|---|---|---|---|---|---|---|---|---|---|---|
|
wt% (max, unless range) |
≤0.30 | 0.29–1.06 | ≥0.10 | ≤0.050 | ≤0.058 | ≤0.40 | ≤0.15 | ≤0.40 | ≤0.40 | ≤0.08 |
Note: Carbon Equivalent (CE) ≤ 0.50, CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
Mechanical Properties of ASTM A234 WPB-S Elbow
| Tensile Strength | Yield Strength (0.2%Offset) | Elongation | Hardness |
|
415-585 Mpa |
≥240 Mpa | ≥20 | ≤197 |
Equivalent Grades of ASTM A234 WPB
| Standard | Equivalent Grade |
|---|---|
| ASTM A234 WPB | WPB (Base Grade) |
| Chinese GB | 20, 20G |
| European EN | P265GH, P235GH |
| German DIN | St45.8 (1.0408), St35.8 (1.0405) |
| Japanese JIS | PT410, PG370 |
| British BS | 224, 243 |
| Matching US Materials | A105 (forged), A106 Gr.B (pipe), A216 WCB (cast) |
Applications of ASTM A234 WPB‑S Elbow
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Oil & Gas: Refineries, transmission pipelines.
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Power Generation: Boiler systems, heat exchangers.
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Petrochemicals: Chemical processing plants.
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General Industry: HVAC, compressed air, water systems.
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Marine & Shipbuilding: Offshore platforms, engine rooms.
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Metallurgy: High-temperature rolling mill lines.
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