Grades of ASTM A350 Carbon Steel Flanges
ASTM A350
LF1 Flange
The ASTM A350 Grade LF1 Flange is a material specification
for carbon and low alloy steel forgings that calls for notch toughness testing
on piping components. Forged flanges, fittings, valves, and other forged and
machined parts are included. Chemical structure, mechanical properties, and
impact tests for notch durability are all covered in this specification.
ASTM A350 LF2
Flange
The ASTM A350 LF2 is a forged carbon/low-alloy steel grade of
forged flanges, forged fittings, and forged valves that are intended for
low-temperature operation and must pass notch durability inspection. The LF2
steels are divided into two classes: Class 1 and Class 2.
ASTM A350 LF3
Flange
Flanges made to ASTM A350 LF3 requirements can withstand
temperatures as low as 150 degrees Fahrenheit (LF3.) These ASTM A350 LF3
Flanges are primarily used in high-energy/high-temperature channeling
applications. All ASTM A350 LF3 Flanges are available with either a raised face
or a flat face. At ambient temperature, the working pressure for a B16.5 ASTM
A350 LF3 Flange is approximately 2.4 times the Flange Class.
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