1, F: free processing state is suitable for the molding process, no special requirements for work hardening and heat treatment conditions
Products, the state of the mechanical properties of products is not regulated
2, O: annealed state for fully annealed to obtain the lowest intensity of processed products
3, H: work hardening state For work hardening to improve the strength of the product, the product can be hardened after processing
(Or not) additional heat treatment to reduce the strength. The code must be followed by two or three Arabic numerals
4, W: solution heat treatment state An unstable state, only applies to the solution heat treatment, the natural aging at room temperature
Alloy, the status code only indicates that the product is in a natural aging stage
5, T: heat treatment state (different from F, O, H) Suitable for products after heat treatment, with or without hardening to reach a steady state, must have one or more digits after the T code.