Carbon steel plate is a kind of material with a large amount of use, which is divided into ordinary low-carbon steel plate and special steel plate, including low-alloy high-strength steel and corrosion-resistant and heat-resistant clad steel plate. Ordinary low-carbon steel sheets are divided into two types: cold-rolled and hot-rolled. Cold-rolled steel sheets have good surface quality and precise thickness and dimensions, and are mostly used in the manufacture of car bodies. Hot-rolled sheets are mostly used in the manufacture of frames and the like.