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[China Aluminum Network] highlights the key characteristics of hot rolling:
Hot rolling is a widely used metalworking process that offers several advantages. One of its main benefits is the significant reduction in energy consumption and cost. This is because, during hot rolling, the metal exhibits high plasticity and low deformation resistance, which makes it easier to shape and reduces the energy required for the deformation process.
Additionally, hot rolling enhances the workability of metals and alloys. It breaks down coarse grains present in the as-cast state, repairs major cracks, and reduces or eliminates casting defects. As a result, the original cast structure is transformed into a deformed structure, leading to improved overall processing performance of the alloy.
Another advantage of hot rolling is that it typically uses large ingots and applies high reduction ratios. This not only boosts production efficiency but also lays the foundation for faster rolling speeds and the implementation of continuous and automated rolling processes.
However, hot rolling has some limitations. It is not always capable of precisely controlling the mechanical properties of the final product. The microstructure and properties of hot-rolled materials may not be uniform, and their strength is generally lower than that of cold-worked products but higher than fully annealed ones. In terms of ductility, hot-rolled materials perform better than cold-hardened products but are less ductile than fully annealed ones.
Moreover, controlling the thickness of hot-rolled products can be challenging, and the dimensional accuracy is relatively lower compared to cold-rolled materials. The surface roughness of hot-rolled products is usually between 0.5 to 1.5 μm higher than that of cold-rolled products. Because of this, hot-rolled sheets are often used as raw material for subsequent cold rolling processes.
Overall, while hot rolling has certain drawbacks, it remains an essential step in the metalworking industry due to its efficiency, cost-effectiveness, and ability to improve material properties before further processing.
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