ASTM A420 WPL6 Low Temperature Carbon Steel Fitting LTC Reducing Tee Buttweld Fittings
ASTM A420 WPL6 Low Temperature Carbon Steel Fitting LTC Reducing Tee Buttweld Fittings
ASTM A420 WPL6 Carbon Steel Reducing Tee LTC (low-temperature carbon steel) Buttweld Fitting is defined as a wrought carbon-steel pipe branch connection component, manufactured to the dimensional and tolerance requirements of ASME B16.9, featuring three ends with beveled weld preparations per ASME B16.25, where the branch outlet has a smaller nominal pipe size (NPS) than the straight-run header. It is produced from a normalized, impact-tested carbon-manganese steel grade (WPL6) conforming to ASTM A420, specifically designed to withstand internal pressure, mechanical stress, and thermal shock while maintaining guaranteed ductile impact resistance at service temperatures as low as -45°C (-50°F). Its primary engineering function is to permanently split or combine fluid flow between pipelines of differing diameters via full-penetration butt-welded joints, without requiring supplemental reinforcement pads.
Chemical Composition of ASTM A420 WPL6 Low Temperature Carbon Steel Fitting LTC Reducing Tee Buttweld 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 ASTM A420 WPL6 Low Temperature Carbon Steel Fitting LTC Reducing Tee Buttweld Fittings
| Standard | Yield Strength 0.2% Proof (MPa) min | Tensile Strength (MPa) min |
| ASTM A420 | 35 | 60-95 |
Impact Test temperature of ASTM A420 Low Temperature Carbon Steel Fitting LTC Buttweld 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 |
Core Function of this type of reducing tee-- Create a small branch take-off from a larger main pipeline.
It connects the continuous main process line, and branches off a smaller size auxiliary line at 90°.
Combine "Tee branching + pipe size reduction in one single fitting"
1. Eliminates the need to assemble a separate equal tee + concentric reducer.
2. Fewer weld joints - lower risk of leakage, saves installation space & labour.
3. Heavy wall construction - Designed for high-pressure service, reinforced wall thickness for demanding process piping.
Applications
- LNG plants, cryogenic facilities, natural gas transmission pipelines
- Petrochemical / refinery low-temperature process systems
- Offshore oil & gas, onshore cold service pipelines
- Power station low-temperature fluid piping
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