The A350 LF2 Class 1 Flange is the most used with class 2 being used in specific applications. The flanges can also be heat treated for hardening. The heat treatment used by manufacturers on the Carbon Steel A350 Lf2 Flanges includes normalizing, tempering, quenching as well as precipitation heat treatment. A350 LF2 Class 1 and class 2 flanges has chemical and many other mechanical properties such as grade class, tensile strength, yield strength, elongation, hardness etc. This is used for higher temperature and thy ear also used for many other industries.