Points for attention in flange heat treatment

　　Annealing and normalizing are used for flange hot working blanks. For carbon steel and alloy steel with flange carbon content greater than 0.5%, annealing treatment is usually used to reduce its hardness and easy to cut; For carbon steel and alloy steel with flange carbon content less than 0.5%, normalizing treatment is adopted to prevent blade adhesion during low hardness cutting. Flange annealing and normalizing are usually arranged after blank manufacturing and before rough machining. It can refine grains and uniform structure and prepare for future heat treatment.

　　Flange heat treatment is mainly used for internal stress caused by rough machining and machining. In order to avoid excessive transportation workload, aging treatment can be arranged before precision machining of parts with general accuracy. However, two or more aging treatments shall be arranged for parts. Simple parts usually do not age.