[China Aluminum Network] hot rolling features are:
(1) Hot rolling can significantly reduce energy consumption and reduce costs. During hot rolling, the metal plasticity is high and the deformation resistance is low, which greatly reduces the energy consumption of metal deformation.
(2) Hot rolling can improve the processing performance of metals and alloys, that is to say, coarse grains in the as-cast state are broken, significant cracks are healed, casting defects are reduced or eliminated, the as-cast structure is transformed into deformed structure, and the processing performance of the alloy is improved.
(3) Hot rolling usually adopts large ingots and rolling at large reductions, which not only improves the production efficiency, but also creates the conditions for increasing the rolling speed and achieving the continuous and automated rolling process.
(4) Hot rolling cannot control the mechanical properties required for the product very accurately, and the microstructure and properties of hot rolled products cannot be uniform. Its strength index is lower than that of the work hardened products, but higher than that of the completely annealed products; the plasticity index is higher than that of the cold hardened products, but lower than that of the completely annealed products.
(5) The thickness dimension of hot-rolled products is difficult to control and the control accuracy is relatively poor; the surface roughness of hot-rolled products is generally 0.5 to 1.5 μm higher than that of cold-rolled products. Therefore, hot-rolled products are generally used as cold-rolled billets.
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