Steel special-shaped parts are mainly used in the manufacture of various containers, construction engineering, machinery manufacturing, container manufacturing, shipbuilding, bridge construction, tractor parts and welding components, etc. Q235B steel plate is a kind of low carbon steel. The national standard GB/T 700-2006 "Carbon Structural Steel" has a clear definition. Q235B is one of the most common steel products in China, with low price, and can be used for most products with low performance requirements.