ASME SA420 Grade WPL6 Low Temperature Carbon Steel Fitting LTC Buttweld 90DEG Elbow
ASME B16.9 ASME SA420 WPL6-S Carbon Steel Buttweld Pipe Fitting 90Deg LR Elbow
ASTM A420 / ASME SA420 WPL6 Buttweld Elbow, it is a pipe fitting (elbow) manufactured according to the material standard ASTM A420 (ASME SA420 is the equivalent Boiler and Pressure Vessel Code designation). The WPL6 designation specifies the grade of material, which is a normalized carbon steel suitable for low-temperature impact testing.
Chemical Composition of ASME SA420 Grade WPL6 Low Temperature Carbon Steel Pipe Fittings
| Mn | C | P | S | Si | Cr | Mo | Ni | V | Cu | Cb |
| 0.050-1.35 | 0.3 | 0.035 | 0.04 | 0.15-0.40 | 0.3 | 0.12 | 0.4 | 0.08 | 0.4 | 0.02 |
Mechanical Properties of ASME SA420 Grade WPL6 Low Temperature Carbon Steel Pipe Fittings
| Standard | Yield Strength 0.2% Proof (MPa) min | Tensile Strength (MPa) min |
| ASTM A420 | 35 | 60-95 |
Impact Test temperature ASME SA420 LTC Low Temperature Carbon Steel Pipe Fittings
| Grade | Impact Test Temperature, ℉ (℃) |
| WPL6 | -50 (-45) |
| WPL9 | -100 (-75) |
| WPL3 | -150 (-100) |
| WPL8 | -320 (-195) |
| Feature | ASTM A420 WPL6 | ASTM A234 WPB (Standard Grade) |
|---|---|---|
| Service Temp | Down to -50°F (-45°C) | Down to -20°F (-29°C) |
| Impact Test | Mandatory (Charpy V-Notch) | Optional (usually not required unless specified) |
| Heat Treatment | Normalizing required | As-formed is usually acceptable |
| Primary Use | Low-temperature/cryogenic service | Moderate temperature service |
Applications
Because of its low-temperature toughness, WPL6 is used extensively in environments where carbon steel would otherwise become brittle and fail (brittle fracture).
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Oil & Gas: Refineries, gas processing plants, and pipelines in cold climates (e.g., Northern Canada, Siberia).
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Petrochemical: Plants handling liquefied gases like propane, butane, or ethylene, which are stored at cryogenic temperatures.
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Power Generation: Feedwater systems and outdoor piping in cold weather regions.
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Industrial Refrigeration: Ammonia plants and cold storage facilities.
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