The difference between cold rolled aluminum coil and hot rolled aluminum coil is mainly due to the difference in the production process.
1,Cold rolled is processed by casting machine into casting roll and cold rolling mill. Hot rolling is caused by heating of aluminum ingot. Under the smelting and casting into flat ingots, through the milling surface, homogenized by the hot rolling mill after rolling.
2, the difference of raw material, hot rolled billets are casting aluminum ingots – heating – rolling into roll, cold rolled billets are casting and rolling – cold rolling.
3, due to the different production processes, resulting in the performance difference between cold rolled aluminum coil and hot rolled aluminum coil. Hot rolled aluminum coil has high surface quality, while mechanical properties and ductility are strong, and oxidation effect is good. Cold rolled aluminum coil mechanical properties is relatively poor, hardness is high, so usually used for the mold.
How to distinguish cold rolled aluminum coil and hot rolled aluminum coil?
1, you can generally determine by visual inspection, usually hot rolled aluminum coil is surface is more bright.
2, they can be tested by the elongation, usually the elongation of hot rolled aluminum coil is higher than cold rolled aluminum coil.
3, the difference can be seen through the crystal, hot rolling is more than 90% of the thermal deformation of the processing of the organization, and in the hot rolling process for simultaneous recrystallization, so the strip has fine grain, the performance is uniform, and cold Casting Tissue with Dust Cylindrical Distribution in Feather Shape.
What are the differences between cold-rolled aluminum coils and hot-rolled aluminum coils
1. Price: The process of cold-rolled aluminum coil is simple, and the price is cheaper than hot-rolled aluminum coil.
2. The supply of blanks is different: the difference between the two lies in the supply of blanks. Hot-rolled material: aluminum ingot--melting and casting into flat ingot--milling--homogenizing annealing--hot rolling into strip.
Casting and rolling material: aluminum ingots--smelting--rolled into strips by casting and rolling mills. Compared with cast-rolled materials, the production efficiency is high, but defects such as composition segregation and inclusions are not easy to solve, and the quality is not as good as hot-rolled materials.
3. The production process is different: cold rolling is processed by a casting machine into a rolled roll (8mm thickness) and processed by a cold rolling machine, while hot rolling is heated by an aluminum ingot (400-500mm thickness), and is formed at a high temperature. Rolled by hot rolling mill;
4. Different performance: hot-rolled aluminum plate has good surface quality, strong mechanical properties and ductility, and good oxidation effect. At the same time, processed aluminum wafers are generally processed from aluminum plates, which are naturally affected by the properties of aluminum plates;
5. Different uses. Cold-rolled aluminum coils are mostly used for molds, while hot-rolled aluminum coils are suitable for stamping and stretching.
6. The difference between finished products: Generally, the elongation of cold-rolled final products is lower than that of hot-rolled final products. If it is a cast-rolled or hot-rolled product, usually the hot-rolled product has a brighter surface.
