hardness<br>This is related to the hardness of the aluminum plate. If the hardness of aluminum plate is too high, it is easy to crack.<br>For example, our commonly used T-state aluminum plate:<br>Then it is necessary to heat treat to o state in advance. The heat treatment methods include annealing and quenching.<br>The difference is:<br>The hardened parts need to be bent within four hours. Otherwise, aging in the air will restore the material to a hard state. The annealed material is always in soft state.<br>In addition, in the processing technology, quenching is more difficult than annealing.
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