ASME SA350 LF2 CL.1 Carbon and Low-Alloy Steel Forged Body Flange for Low Temperature

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ASME SA350 LF2 CL.1 Carbon and Low-Alloy Steel Forged Body Flange for Low Temperature

ASTM A350 (ASME SA350) applies to carbon and low-alloy steel forged or ring-rolled piping components intended primarily for low-temperature service, with mandatory notch toughness testing. Within this family, A350 LF2 is the most common LTCS grade used across oil & gas, petrochemical, LNG-adjacent utilities, and cold-region pipeline stations.

ASME SA350 LF2 CL1 flange is formed by integral forging, where the body (including sealing face, neck, bolt holes, etc.) is machined from a single forged billet without welded seams. It meets the standard’s requirements for chemical composition, mechanical properties (such as tensile strength, yield strength, elongation), and Charpy V-notch impact energy at -46°C. This flange is suitable for valves, equipment connections, and pressure vessel nozzles in petrochemical, natural gas, marine engineering, and low-temperature piping systems, ensuring safe and reliable operation under cryogenic conditions.

Chemical & Mechanical Properties

Mechanical Properties

Key Adventages

• The material is strictly controlled to maintain high impact toughness even at -46°C, effectively preventing brittle fracture.
• The flange body is integrally forged from a single billet, eliminating potential weak points and leakage risks associated with welds.
• Widely used in LNG (liquefied natural gas), liquid nitrogen, liquid oxygen, arctic pipelines, cryogenic valves, and pressure vessels.
• The low‑carbon and low‑alloy composition provides moderate corrosion resistance and resistance to stress cracking under low‑temperature conditions.
• Machined to standard dimensions, allowing direct connection with ASME B16.34 cryogenic valves and other low‑temperature piping components.

Specifications of ASTM A350 Body Flange

Testing

• Chemical Composition Analysis
• Mechanical Properties Testing(*Charpy V-Notch Impact Test)
• Non-Destructive Testing(NDT): Ultrasonic Testing, Magnetic Particle Testing, Liquid Penetrant Testing, Radiographic Testing
• Dimensional & Visual Inspection
• Metallographic Examination