Semi-finished steel forms that are used for the production of long products. Billets generally have square cross-sectional areas compared to blooms and slabs, which generally have larger aspect ratios. Billets can be produced from a caster or rolled from a bloom. NatSteel Asia produces most of the billets it consumes in-house with continuous casting technology. Only a small proportion of billets (special grades) are purchased from international steel manufacturers. In-house production of billets provides flexibility in terms of material properties and production yield optimisation.