Performance Analysis Of Stainless Steel Square Tube

Metals in the atmosphere can react with oxygen to form an oxide film on the surface, and the iron oxide formed on ordinary carbon steel will continue to oxidize, so that the rust continues to expand, and eventually form holes. This can protect the carbon steel surface with paint or oxidation-resistant metal plating, but this protective layer is only a film, and if the protective layer is broken, the steel below begins to rust again. Whether the stainless steel pipe is corroded is related to the chromium content in the steel, when the chromium content in the steel reaches 12%, in the atmosphere, a layer of passivated, dense chromium-rich oxide is formed on the surface of the stainless steel pipe to protect the surface and prevent further reoxidation. This oxide layer is extremely thin, through which you can see the natural luster of the steel surface, giving stainless steel a unique surface. If the chromium film is destroyed, the chromium in the steel and the oxygen in the atmosphere regenerate the passivation film and continue to play a protective role. In some special environments, stainless steel will also have some local corrosion and failure, but stainless steel, unlike carbon steel, will not appear uniform corrosion and fail, so the corrosion allowance is meaningless for stainless steel pipes.