ASTM A182 chrome-moly flanges (F5-F91) are built for high-heat creep resistance in refineries. In contrast, ASTM A350 LF2 is a low-temperature carbon steel designed for cryogenic or cold-climate service, maintaining high notch toughness down to -46°C. Both utilize a Weld Neck design with a tapered hub to transition stress from the flange to the pipe, ensuring leak-proof integrity under thermal cycling and extreme pressure in critical power and oil infrastructure.
Attribute,Specification / Details
Material Standards,ASTM A182 (Alloy) / A350 (Low-Temp)
Flange Type,Weld Neck (Type 11)
Alloy Grades,"F5, F9, F11, F22, F91"
Cryogenic Grade,A350 LF2 (Class 1 or 2)
Pressure Class,300LBS (and 150# to 2500#)
Service Temp (F91),Up to 650°C (1200°F)
Service Temp (LF2),Down to -46°C (-50°F)
Impact Testing,Required for LF2 (Charpy V-Notch)
Dimensional Spec,ASME B16.5 / B16.47
Manufacturing,"Forged, Normalized, & Tempered"
Facing,Raised Face (RF) / Ring Joint (RTJ)
Weld Preparation,37.5° Bevel (Butt-weld)
Yield Strength (LF2),Min. 250 MPa (36 ksi)
Tensile Strength (F22),Min. 485 MPa (70 ksi)
Bore Profile,Machined to match pipe Schedule
Traceability,Heat Number stamped on rim
Certification,EN 10204 3.1 MTC
Primary Industries,"Oil, Gas, Power, LNG, Chemical"
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E-mail: sales@fluvalve.com
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