Low-Temperature Steel Flat Welding Flange (also called a Plate Flange or Plain Flange) is designed for piping systems operating in sub-zero environments (down to -196°C). Made from specially treated carbon or low-alloy steel, it maintains toughness and impact resistance even in cryogenic conditions, preventing brittle fracture.
Key Features & Benefits
✅ Excellent Low-Temperature Toughness
Manufactured from ASTM A350 LF2/LF3, A420 WPL6/WPL3, or similar grades.
Charpy V-notch impact tested at -46°C to -101°C (varies by grade).
✅ Flat Face (FF) Design
Simple, cost-effective, and easy to install.
Typically used with flat gaskets for low/medium-pressure applications.
✅ Weldability & Compatibility
Suitable for butt welding or fillet welding to pipes.
Often used in LNG, refrigeration, and cryogenic storage systems.
✅ Cost-Effective for Moderate Pressures
Not recommended for high-pressure/high-stress applications (use Weld Neck instead).
Material Grades & Standards
| Standard | Grade | Minimum Temp. Range | Key Application |
|---|---|---|---|
| ASTM A350 | LF2, LF3 | -46°C to -101°C | General cryogenic service |
| ASTM A420 | WPL6, WPL3 | -46°C to -104°C | Low-temperature piping |
| EN 10222-4 | P355NL2 | -60°C | European cryogenic systems |
Common Flange Types
Flat Face (FF) Flange – Prevents flange face damage when paired with soft gaskets.
Raised Face (RF) Flange – Less common for low-temp applications but available.
Applications
✔ LNG (Liquefied Natural Gas) Plants – Storage & transport at -162°C.
✔ Cryogenic Storage Tanks – Liquid nitrogen (-196°C), oxygen (-183°C).
✔ Refrigeration Systems – Ammonia, CO₂ cooling.
✔ Chemical Processing – Ethylene, propylene pipelines.
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