Steel gratings are usually painted steel grating, stainless steel gratings and hot-dip galvanized steel grating. The hot-dip galvanized steel grating is the most widely used. Hot-dip galvanized steel grating is made of load flat steel and cross bar arranged at a certain distance and longitude and latitude. It is welded on the high-voltage resistance welding machine to form the original plate. The finished products are processed by cutting, cutting, opening and wrapping processes, and then processed by hot galvanizing.