Pharma Aluminum alloy heat treatment code as follow

F: Free machining state (applicable to products without special requirements for work hardening and heat treatment conditions during the molding process, the mechanical properties of the products in this state are not specified)

O* :Annealed Condition (for processed products fully annealed for minimum strength)

H : Work hardening state (applicable to products whose strength is increased by work hardening. After work hardening, the product can undergo additional heat treatment to reduce the strength. The H code must be followed by two or three Arabic numerals)

W: Solution treated state (an unstable state, only applicable to alloys that are naturally aged at room temperature after solution heat treatment, this state code only indicates that the product is in the natural aging stage)

T : Heat treatment state (applicable to products that have been work hardened to a stable state after heat treatment)

T1: artificial aging

T2: Annealed

T4: solution treatment + natural aging

T5: Solution treatment + incomplete artificial aging

T6: solution treatment + complete artificial aging

T7: Solution treatment + stabilization treatment

T8: The state of cold working and artificial aging after solution treatment

T9: The state of artificial aging after solution treatment, and then cold working