The biggest sector of secondary ingot manufacture, on a tonnage basis, is aluminum alloys. These predominantly go into the aluminum foundry industry, so that the principal alloying elements in consideration are silicon and manganese. Generally speaking, magnesium and zinc are not welcome.
Aluminum alloys are produced from aluminum scrap remelting, adding virgin metals (aluminum, silicon, magnesium,manganese). They are in forms of ingots, billets or slabs.
The future contract of aluminum alloys is quoted at London Metal Exchange (LME), even if it is not always used from aluminum alloys producers.
Aluminum alloys are traded on London Metal Exchange (LME) and its contract is conforming to A380.1, 226 o AD12.1 specifications. Aluminum alloys are in form of ingots, t-bars, small or large sows. Lot size (warrant) is 20 ton (with a +/- 2% tolerance).
On the market you can find different qualities and different names of aluminum alloys, linked to different international standards: EN46100, GALSI12Cu, EN46000, ALSI8 Cu3Fe, DIN226, etc.. There are different brands, forms and different lot size.
Aluminum alloys are always accomplished with chemical analysis certificates.