Carbon steel is steel in which the main interstitial alloying constituent is carbon in the range of 0.12–2.0%.Mild steel (steel containing a small percentage of carbon, strong and tough but not readily tempered), also known as plain-carbon steel
Alloy steel is steel that is alloyed with a variety of elements in total amounts between 1.0% and 50% by weight to improve its mechanical or physical properties.
Bright drawn steel is essentially black steel that has had further processing. The steel is processed further in cold reduction mills, where the material is cooled (at room temperature) followed by annealing and/or tempers rolling