Composite steel plate is to point to, single or a variety of steel more than steel through, such as: stainless steel composite steel plate is the use of explosion, rolling or explosive rolling and other processes, the stainless steel plate and ordinary steel plate (carbon structural steel, low alloy high strength structural steel, high quality carbon structural steel) composite and become the steel plate. It has the characteristics of two different kinds of steel at the same time, not only has the corrosion resistance of stainless steel, but also has the advantages of low price and good rigidity of ordinary steel. Composite steel plate is to protect ordinary steel plate from corrosion, can be electroplated, sticky and spray method, in the surface of the steel plate on a layer of protection "coat", the formation of composite steel plate.