Aluminum coils can be produced from aluminum ingots or other forms of raw aluminum stock (via processes known as cold rolling or direct casting), or they can be rolled directly through a smelting process (known as continuous casting). These rolled aluminum sheets are subsequently wound onto a mandrel. Compared to individual aluminum sheets, aluminum coils offer higher density, making them more convenient for transportation and storage. Aluminum coils can be used to manufacture a wide variety of components utilized across nearly every industry sector.
Pure aluminum is too soft for most manufacturing applications; consequently, the majority of aluminum coils are produced and supplied in alloy form. These alloys consist of at least two or more elements, with aluminum being one of the primary constituents. Aluminum alloys intended for sheet products are identified using a four-digit numbering system administered by the Aluminum Association. By alloying aluminum with other metals, its mechanical and physical properties-such as strength, formability, and others-can be tailored to meet specific requirements.
Aluminum coils are available in a wide range of lengths, widths, and thicknesses (also referred to as "gauges"). The specific dimensions chosen depend on the size of the component being manufactured as well as the production process employed. Various surface finishes are available, including mill finish, matte finish, and bright finish. The choice of surface finish is determined by the intended application of the component and its desired aesthetic appearance.
Aluminum coils are also available in various "tempers" (or states). They can be supplied in an "as-fabricated" state (designated as the "F" temper); in this state, the aluminum coil has no specified mechanical property limits, and no special controls are applied regarding heat treatment or strain hardening conditions. Because the properties of aluminum in this state are subject to variability, it is typically used for products that are still in intermediate stages of production. Another option is the strain-hardened state, which is applicable to wrought products-such as coils-that have had their strength enhanced through cold rolling or cold working. Additionally, aluminum coils can undergo annealing-a process involving heating the material under controlled conditions to achieve a specific combination of strength and formability.
Why Choose Aluminum Over Other Metals?
Weight - The primary advantage of aluminum over most competing materials with similar properties is its lighter weight. This makes it an ideal choice for applications-such as those in the automotive and aerospace industries-where strict requirements regarding total product weight must be met. Furthermore, aluminum typically entails lower transportation costs.
Machinability - Aluminum possesses excellent ductility, meaning it can be easily formed, stamped, or machined as required to suit specific manufacturing needs. Its exceptional processing characteristics and versatility have greatly contributed to the widespread adoption of aluminum. Aluminum is the material of choice for numerous manufacturing processes, such as drawing, roll forming, and stamping.
Corrosion Resistance-It also possesses inherent resistance to corrosion and rust, offering a significant advantage over steel.
Value-The cost of aluminum is considerably lower than that of materials like copper, enabling manufacturers to reduce material costs without compromising performance.
Recyclability-Aluminum is easily recyclable and can be reused repeatedly, thereby minimizing its environmental impact.
Conductivity-Aluminum is an excellent conductor of both heat and electricity. When measured by equivalent cross-sectional area, the electrical conductivity of electrical-grade aluminum is 62% that of electrical-grade copper. However, when compared by weight, aluminum's conductivity is 204% that of copper.
