Semi-finished casting products are intermediate castings produced in a steel mill that need further processing before being finished goods. A billet is a length of metal that has a round or square cross-section.
Billets are further processed via profile rolling and drawing, Final products include bar stock and wire.
A slab is a length of metal that is rectangular in cross-section, The slab is created directly by continuous casting or indirectly by rolling an ingot on a slabbing mill. Slabs are usually further processed via flat rolling, skelping, and pipe rolling. Common final products include sheet metal, plates, strip metal, pipes, and tubes.