» Technical » ASTM A350 LF2: Class 1 vs. Class 2

ASTM A350 LF2: Class 1 vs. Class 2

September 30, 2019

Class 1 and Class 2 of ASTM A350/ ASME SA-350 grade LF2 have the same chemical composition and mechanical properties. Even the allowable stresses of Class 1 and Class 2 in ASME Codes are the same. The main characteristic that distinguishes Class 1 from Class 2 is its minimum applicable temperature. The minimum applicable temperatures are -50°F [-46°C] for LF2 Class 1 and -0°F [-18°C] for LF2 Class 2, respectively. The minimum applicable temperature is also the standard Charpy V-notch impact test temperature.

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