Q235B steel plate is a kind of low carbon steel, which is mainly used in the manufacture of various containers, construction engineering, machinery manufacturing, container manufacturing, shipbuilding, bridge construction, tractor parts and welding components. According to the thickness of steel plate, thin steel plate < 4 mm (the thinnest 0.2 mm), medium thick steel plate 4 ~ 60 mm, ultra thick steel plate 60 ~ 115 mm. Steel plate is divided into hot rolling and cold rolling according to rolling. According to the professional use, there are oil barrel plate, enamel plate, bulletproof plate, etc.; according to the surface coating, there are galvanized sheet, tinplate, lead plate, plastic composite plate, etc. It's used everywhere in life.