Of the global steels, 50 to 60% are made of sheet metal, most of which are finished products that have been stamped and pressed. The body of the car, the radiator piece, the steam drum of the steam boiler, the casing of the container, the iron core silicon steel of the electric motor and the electric appliance, etc. are all stamped and processed. There are also a large number of stamping parts in instruments, household appliances, office dulls, storage utensils and other products.