wear. Or building materials in one of the highest strength metallic materials, stainless steel. Because stainless steel has good corrosion resistance, so it can maintain the structural components of the integrity of engineering design permanently. Chromium stainless steel is set high mechanical strength and extensibility, easy to parts manufacturing, can satisfy the requirement of architects and structural designers. All metals and the reaction of the oxygen in the atmosphere, the formation of oxide film on the surface. Unfortunately, the iron oxide in the form of ordinary carbon steel to oxidation of, make the corrosion expansion, eventually forming holes. You can paint or oxidation resistant metal (e.g., nickel and chromium) plating to ensure the carbon steel surface, but, as everyone knows, this protection is only a thin film.