Why does stainless steel seamless reducer rust?

　　Now many users are plagued by pipe rusting, so these users should choose products such as stainless steel reducer, which are never rusty. The talents produced are mainly stainless steel. This material has good corrosion resistance. It is one of the most strong material in metal material. Because of the hardness of stainless steel, it enables structural components to permanently retain the integrity of engineering design. Unfortunately, iron oxide formed on ordinary carbon steel continues to oxidize, causing corrosion to expand and eventually form holes. Paint or oxidizing metal can be used to electroplate the surface of carbon steel, but, as it is known, this protection is only a kind of film. All metal boxes react with oxygen in the atmosphere and form oxide films on the surface.