1. Introduction to ASTM A350 LF2 Class 1 Girth Flanges

ASTM A350 LF2 Class 1 Girth Flanges are forged carbon/low-alloy steel fittings designed for low-temperature service down

to -46°C (-50°F). These flanges meet stringent impact toughness requirements (Charpy V-notch testing) for cryogenic

applications in pipelines, LNG plants, and offshore systems. Manufactured in compliance with ASME B16.5 dimensional

standards, they ensure leak-proof connections in high-pressure environments.

2. Chemical Composition Requirements

The chemical composition of ASTM A350 LF2 CL1 ensures optimal low-temperature performance and weldability:

3. Mechanical Properties of LF2 CL1 Flanges

4. Equivalent Grades & International Standards

5. Key Applications in Industry

ASTM A350 LF2 CL1 flanges are critical in:

• Cryogenic Systems: LNG terminals, liquid nitrogen pipelines
• Oil & Gas: Subsea pipelines, Arctic drilling rigs
• Power Plants: Cooling systems, hydrogen handling
• Chemical Processing: Ethylene, ammonia, and propane transport

6. Manufacturing & Quality Assurance

• Process: Die-forged & heat-treated (normalized or quenched + tempered)
• Testing: 100% UT + hydrostatic testing per ASME B16.34
• Certification: Mill Test Reports (MTRs) with traceable heat numbers
• Dimensions: ASME B16.5 Class 150 to 2500, NPS 1/2" to 24"