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The valve with ASTM A350 carbon steel flange requiring notch toughness testing

A350 Lf2 Class 2 Flange is used in ambient and higher temperature service. After hot working and before reheating for heat treatment, the forging shall be allowed to cool substantially below the transformation range.

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The heat treatment methods are normalizing and tempering. The A350 LF2 Blind Flange is a type of flange that is fitted on to the ends of pipes to close a pipe line completely.

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