铝合金的状态代号：
Status code of aluminum alloy:
T 热处理状态
T heat treatment status
T0 固溶热处理后，经自然时效再通过冷加工的状态。适用于经冷加工提高强度的产品
After t0 solution heat treatment, natural aging and then cold working. It is suitable for products with high strength after cold working
T1 由高温成型过程冷却，然后自然时效至基本稳定的状态。适用于由高温成型过程冷却后，不再进行冷加工（可进行矫直、矫平，但不影响力学性能极限）的产品。
T1 is cooled by high temperature forming process and then aged to a stable state. It is suitable for the products which are cooled by high temperature forming process and are no longer cold processed (straightening and leveling can be carried out, but the mechanical property limit is not affected).
T2 由高温成型过程冷却，经冷加工后自然时效至基本稳定的状态。适用于由高温成型过程冷却后，进行冷加工、或矫直、矫平以提高强度的产品
T2 is cooled by high temperature forming process, and then aged to a stable state after cold working. It is suitable for cold working, straightening and leveling after cooling in high temperature forming process to improve the strength of products
T3 固溶热处理后进行冷加工，再经自然时效至基本稳定的状态。适用于在固溶热处理后，进行冷加工、或矫直、矫平以提高强度的产品。
T3 solution heat treatment followed by cold working, and then natural aging to a basically stable state. It is suitable for cold working, straightening and leveling after solution heat treatment to improve the strength of products.