Generally, it is easy to distinguish between steel billets and steel products. However, for some steel billets with the same specifications and purposes as steel products (such as rolling pipe billets), they can be distinguished by whether they are used by other industries, whether they are processed by steel processing processes, and whether they are processed by finished rolling mills.

Continuous cast steel square billet and rectangular billet are mainly represented by plain carbon steel, low carbon and low silicon cold rolled material, high-quality carbon structural steel, low alloy high strength steel, special steel grades, etc.