ASTM A350 LF2 Self Reinforeced Nozzle For Cryogenic Pressure Vessels and Systems
ASTM A350 LF2 is a low-temperature carbon steel forging material that requires mandatory notch toughness testing. It is a specific grade within the ASTM A350 standard. Its excellent resistance to brittle fracture in low-temperature environments makes it widely used in the manufacture of pressure-bearing piping components such as flanges, valves, and fittings. It is particularly suitable for applications requiring low temperatures or high toughness, such as liquefied natural gas (LNG) and petrochemical cold zones.
The ASTM A350 LF2 Self-Reinforced Nozzle is a nozzle made of LF2-grade forged steel with -46°C impact toughness. Its inherently thickened wall meets the ASME specification for opening reinforcement, eliminating the need for external reinforcement rings. This design is particularly suitable for applications requiring high low-temperature toughness and structural simplicity. Design and manufacturing must strictly adhere to the ASME BPVC specification.
Chemical Composition
| Element | Composition |
| Carbon, max | 0.30 |
| Manganese | 0.60 - 1.35 |
| Phosphorus, max | 0.035 |
| Sulfur, max | 0.040 |
| Silicon [Note A] | 0.15 - 0.30 |
| Nickel | 0.40 max [Note B] |
| Chromium | 0.30 max [Note B,C] |
| Molybdenum | 0.12 max [Note B,C] |
| Copper | 0.40 max [Note B] |
| Columbium | 0.02 max [Note B] |
| Vanadium | 0.08 max |
Mechanical Properties
| Tensile Strength, ksi [MPa] | Yield Strength, min, ksi [MPa] [Note B, C] | Elongation | Reduction of Area, min, % |
| Round Specimen in 4D, min, % | Strip Specimen in 2 Inch [50mm], min, % |
70–95
[485–655] | 36 [250] | 22 | 30 | 30 |
Charpy V-Notch Energy Requirements
| Minimum Impact Energy Required for Average of Each Set of Three Specimens, ft.lbf [J] | Minimum Impact Energy Permitted for One Specimen only of a Set, ft.lbf [J] | Testing Temperature, °F [°C] |
| 15 [20] | 12 [16] | −50 [−46] |
Application
Cryogenic Pressure Vessels and Systems
Liquefied Natural Gas (LNG) Facilities: Connections to Storage Tanks, Vaporizers, and Cryogenic Pumps.
Petrochemical Cryogenic Plants: Ethylene/Propylene Splitter, Cryogenic Storage Tanks, and Refrigeration Units.
Air Separation Units (ASUs): Liquid Oxygen/Liquid Nitrogen Storage Tanks and Pipeline Interfaces.
Harsh Environment Pressure Pipelines
Branch Connections for Oil and Gas Pipelines in Arctic and Cold Regions.
Valve and Instrument Interfaces for Refrigerant (e.g., Ammonia, CO₂) Circulation Systems.
High-Cleanliness and Corrosion-Sensitive Systems
Aseptic Connections for Pharmaceutical/Bioreactor and Food Processing Tanks.
Seawater Cooling Systems (LF2 requires an anti-corrosion coating).
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