What does aluminum plate "H12" mean?
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H12 indicates hardening of the work to the 1/4 state.Two digits (called hxx States), or three bit Arabia numbers (called hxxx States) are added to the letter H to indicate the subdivision status of the H.The first digits behind the H represent the basic handler for this state, as shown below:H1 - simply work hardening treatment status. The utility model is suitable for the condition that the required strength is obtained by the work hardening without the heating treatment. H2 - the state of work hardening and incomplete annealing. Apply to the work hardening degree exceeds the requirements of the finished products, after incomplete annealing, so that the strength to reduce the target products. For the alloy softening natural aging at room temperature, H2 and H3 corresponding to the minimum ultimate tensile strength of the same value; for other alloys, H2 and H1 corresponding to the minimum ultimate tensile strength of the same value, but the extension rate is slightly higher than h1. H3 - the state of work hardening and stabilization treatment.
The utility model is suitable for the products with stable mechanical performance after work hardening, heat treatment or heat treatment in the process of processing. The H3 state is only applicable to the alloy gradually softening at room temperature (unless stabilized). H4 - the state of work hardening and coating treatment. The utility model is suitable for products with incomplete annealing after work hardening and after coating treatment.The second digits behind the H indicate the degree of work hardening of the product. The number 8 indicates a hard state. The minimum tensile strength of a hx8 is specified by the sum of the minimum tensile strength of the o state and the specified strength difference. For the states between O (annealed) and hx8 States, the numbers from 1 to 7 should be added after the HX code, adding the number 9 to the HX to indicate a more severe state of hardening than the hx8.