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Stainless steel is long and hollow circular steel, mainly used in petroleum, chemical, medical, food, light industry, machinery and instruments and other industrial running piping, and mechanical structure of pipeline components. In addition, the weight is light while bending and resisting torsional strength, so it is widely used in manufacture of mechanical parts and engineering structures, also used in producing all kinds of conventional weapons, the barrel, shelled sand so on.
Characteristics of stainless steel: all metals react oxygen in the atmosphere, forming oxide in the surface. Unfortunately, the iron oxide formed on carbon steel continues to oxidation, constantly expands corrosion, and ultimately the forms holes. Using paint or oxidation-resistant metals (e.g. zinc, nickel and chromium) electroplates to ensure the steel surface, but, as people know, this protection is only a weak film. If the protective layer is damaged, the following steel began to rust. The corrosion resistance of stainless steel depends on the alloying elements contained. Chromium is the basic elements to obtain corrosion resistance of stainless steel, when the chromium content in steel reaches 1.2%, the role of oxygen between chromium and corrosive in the steel surface forms a thin oxide film, which can prevent the further corrosion of the steel matrix. |
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