Hot Rolled

Hot rolling is relative to cold rolling, which is rolling below the recrystallization temperature, and hot rolling is rolling above the recrystallization temperature. Hot rolling can be used to make various standard steel pipes such as ASTM A53, A106 and so on. General speaking, a billet is rolled through several passes after heating, then trimmed, and corrected to become a steel plate. This is called hot rolling. Can significantly reduce energy consumption and reduce costs. During hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduces the energy consumption of metal deformation. Hot rolling can improve the processing performance of metals and alloys, that is, the coarse grains in the cast state will be broken, significant cracks will heal, reduce or eliminate casting defects, transform the as-cast structure into a deformed structure, and improve the processing performance of the alloy.

Hot rolling refers to rolling performed above the metal recrystallization temperature.
Recrystallization is when the annealing temperature is high enough and the time is long enough, new strain-free grains (recrystallization core) are generated in the fiber structure of the deformed metal or alloy, and the new grains continue to grow until the original deformed structure is completely Disappears, and the properties of the metal or alloy also change significantly. This process is called recrystallization, and the temperature at which new grains begin to be generated is called the recrystallization temperature, and the temperature at which the microstructure is completely occupied by the new grains is called the end. The recrystallization temperature is generally the arithmetic average of the recrystallization temperature and the final recrystallization temperature. Generally, the recrystallization temperature is mainly affected by factors such as alloy composition, degree of deformation, original grain size, annealing temperature, etc. .
The above is the simple principle of hot rolling in theory. In the actual production of our aluminum processing industry, the main manifestation is that when the ingot is heated to a certain temperature in the heating furnace, that is, above the recrystallization temperature, the rolling is performed. The determination of this temperature is mainly based on the phase diagram of the aluminum alloy, that is, in the most ideal case, the heating temperature is determined based on the temperature of the alloy at 80% of the solid phase line in the multiphase diagram, which is The problem of multiple phase diagrams of different alloys is involved. The determination of the heating temperature is based on 80% of the solid phase line of the alloy. In the implementation of the system, according to the actual production situation, according to the operation of the equipment, the results obtained by modification are added Suitable temperature for the production of this alloy

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