normalizing-凯发k8官方旗舰厅

the steel is heated to a temperature above the critical range, after which it is cooled in still air to produce a generally fine pearlite structure. the purpose is to promote uniformity of structure and properties after a hot-working operation such as forging or extrusion. steels may be placed in service in the normalized condition, or they may be subjected to additional thermal treatment after subsequent machining or other operations.