The cost of hot rolling is higher than that of cast rolling. However, the difference between them is not just a matter of production cost. The maturity level of hot rolling technology and equipment control level are far higher than those of cast-rolled products. Moreover, hot rolling is rolled within the recrystallization temperature range of aluminum alloy without alloy composition. Restriction, which means that the product can cover all aluminum alloy series, such as 3000 series, 5000 series, 2000 series, 7000 series, etc.
Cold rolling refers to the rolling of hot-rolled plates at room temperature. Although the aluminum plate is heated during the process, it is mainly the recrystallization temperature (the lowest temperature at which the recrystallization process can be completed within 1 hour of holding time is called recrystallization). Crystallization temperature.) Rolling is performed as follows.
Casting-rolling is a new type of technology developed after the 1970s. Its advantage is that molten aluminum directly passes through the rotating mold to directly produce strip products. It has considerable equipment and investment than hot rolling. However, because it is a new technology, the process defects of crystallization and casting have not been solved in the world. Therefore, the casting-rolling mill can only produce 1000 series pure aluminum and a few 3000 series alloy products, domestic and some countries in the world (For example, Brazil and the United States) want to break the alloy limit of casting and rolling and produce 5000 series alloys, but at least so far, they have not been widely successful.
Hot-rolled material: aluminum ingot–melted and cast into flat ingot–milled face–uniform annealing–hot rolled into strip.
Cast-rolled material: aluminum ingots-smelted-rolled into strips by casting and rolling mills
Cast-rolled material has high production efficiency, but defects such as component segregation and inclusions are not easy to solve, and the quality is not as good as hot-rolled material.