First number: indicates the main added alloy element.
1: Pure aluminum2: Mainly added alloy elements for copper3: The main addition of alloying elements is manganese or manganese and magnesium4: Mainly added alloy elements for5: Mainly added alloy elements for magnesium6: Mainly added alloying elements for and magnesium7: Mainly added alloying elements for zinc and magnesium8: No new alloy The second digit: indicates that the total alloy element content or impurity component content is modified.0: Table original alloy1: The original alloy is revised for the first time2: The original alloy is modified for the second time Third and four digits:Pure aluminum: Represents originAlloy: Represents the code of individual alloy\"-\": The back HN or TN represents the chain symbol of the processed curved state or the heat treatment state - Hn: indicates the link symbol of the non-heat treatment alloy.-Tn: indicates the chain symbol of the heat treatment alloyT5:Indicates that is cooled by a high temperature molding process and then performs artificial aging. Suitable for cooling by cooling by high temperature molding process (can be straightened, fault, but does not affect the ability to perform \"aluminum profile products.
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