The types of steel plates are generally divided into thick plates (above 6mm), medium thick plates (3-6mm) and thin plates (below 3mm) according to their thickness. As far as the plate making process is concerned, low carbon steel plate can be divided into cold rolling and hot rolling. Hot rolling alone can produce low carbon steel plates of about 1.2mm and stainless steel plates of about 2mm, while thinner plates are produced by cold rolling, annealing and quenching and tempering rolling.It is divided into ordinary low-carbon steel plate and special steel plate, including low-alloy high-strength steel and corrosion and heat resistant clad steel plate. Ordinary low carbon steel plate is divided into cold rolling and hot rolling. The cold rolling steel plate has good surface quality, accurate thickness and size, and is mainly used for making car bodies. Hot rolled plates are mostly used for making frames and the like.