The board is a generous surface area than are large and flat steel. Materials are Q235,20 #, 16MN, 304,316 and so on. According to the thickness of the steel sheet (thickness 4 mm) in practice, often referred to as the thickness of 60 mm steel plate special plate, collectively known as the thick steel plate. Width is relatively small, the length of a long plate, called strip, identified as a separate species.