Traditional hardware does not include which of the following metals

Traditional hardware refers to metals that were widely used in ancient times in the manufacture of tools, implements, weapons, building materials, etc., including gold, silver, copper, iron and tin. Aluminum, on the other hand, is a relatively light, soft, and easy-to-machine metal that wasn't discovered and industrially produced until the late 19th century, outside the realm of traditional hardware. However, in modern industry, aluminum has become a very important metal, widely used in aviation, automotive, construction, electronics and other fields.