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Heat treatment steps for aluminum coils
The heat treatment of aluminum coils refers to the planned thermal processing of aluminum coils through a series of temperature and time controlled process steps such as heating, insulation and cooling. The heat treatment process of aluminum coils is roughly divided into three parts: annealing, solution treatment and aging treatment. These heat treatment steps will have an impact on the crystal structure, hardness, strength, conductivity and corrosion resistance of aluminum coils.
Annealing is the first step in heat treatment and is designed to eliminate stress and crystal defects that may occur during cold working of aluminum coils. After being held at high temperature for a period of time, the crystal structure of the aluminum coil will change, the grains will be redistributed, and some dislocations will be eliminated. This can make the aluminum coil more uniform, the lattice structure more regular, and improve the overall conductivity and plasticity of the aluminum coil.
This is followed by solid solution treatment. The purpose of this step is to dissolve the alloying elements in the aluminum matrix at high temperatures to form a uniform solution. This process helps increase the hardness and strength of the aluminum coil. In solid solution treatment, the solubility of alloying elements increases with the increase of temperature, so that the alloying elements in the solid solution reach the maximum concentration. After maintaining a certain temperature for a certain period of time, a strengthening effect is formed through rapid cooling, further improving the hardness and strength of the aluminum coil.
Aging treatment refers to keeping the alloy elements in the solid solution formed for a period of time at a relatively low temperature to re-precipitate and form fine precipitates. These precipitates can effectively hinder crystal slip and improve the strength and corrosion resistance of aluminum coils.
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