High-Purity Aluminum Ingot

High-purity aluminum ingots are standardized semi-finished products produced through electrolytic refining and casting processes. They serve as the primary raw material input for downstream fabrication of aluminum alloys, extrusions, and rolled products. In B2B supply chains, these ingots are traded as commodities based on purity grades and chemical specifications. They enable manufacturers to produce consistent, high-quality aluminum components for aerospace, automotive, and construction applications. The ingots are typically supplied in standardized shapes and weights, facilitating handling, transport, and remelting in customer foundries. Key specifications include a minimum aluminum content of 99.7% by weight, with maximum iron and silicon impurities of 0.20 ppm and 0.10 ppm respectively, as referenced in GB/T 1196. Physical properties include a density of 2.70 g/cm³, a melting point of 660°C, and an electrical conductivity of at least 59.0% IACS. Mechanical properties in the as-cast condition include a minimum tensile strength of 80 MPa and elongation of 25%. Standard ingot dimensions are 600×100×50 mm, with a weight range of 15–25 kg. Surface quality must be free of cracks and porosity, and ingots are bundled with steel straps for transport. These values are typical reference ranges; actual specifications must be confirmed with the supplier for each batch. The ingots are intended for further processing and are not finished components. Buyers should verify that the material meets their specific application requirements, including alloying, casting, and forming processes. Compliance with standards such as GB/T 1196 is a procurement reference, not a guarantee of certification. Always consult the manufacturer for detailed technical data and quality assurance documentation.

High-purity aluminum ingots are produced by electrolytic reduction of alumina (Al₂O₃) in molten cryolite (Na₃AlF₆). In this process, an electric current is passed through the molten bath, causing aluminum ions to be reduced to metallic aluminum at the cathode. The molten aluminum is then tapped and cast into standardized ingot shapes. The purity is controlled by the quality of the alumina and the electrolysis conditions. After casting, the ingots are cooled and inspected for surface defects. The resulting ingots are semi-finished materials that are remelted by downstream manufacturers for further processing into alloys, extrusions, or rolled products. The electrolytic process is energy-intensive and requires careful control of temperature and bath composition to achieve the desired purity and consistency.