When ordinary carbon steel is exposed to the air, it will react with the oxygen and water in the air, causing the steel to rust and form brittle, layer-by-layer rust until the entire thing rots away. Later, people came up with many methods to fight against corrosion, such as painting, enamel, and electroplating metal on the surface to protect the surface of carbon steel. However, if this layer of protection is destroyed, the carbon exposed in the air will Steel will be corroded again.

But if we are talking about processing stainless steel pipe fittings, it is different, because this is a metallurgical process, from the inside to the outside. The secret of stainless steel pipe fittings is that metal chromium is added to the carbon steel, and the content is not low, about 12%. After it comes into contact with the air, the chromium will react with oxygen to form a dense layer of blunt material on the surface of the carbon steel. Chemical film can effectively and continuously protect stainless steel pipe fittings. Moreover, this passivation film is super thin, and the natural luster of the steel surface can be seen, making the stainless steel pipe fittings have very unique surface characteristics. However, there is no guarantee that this protective film will not be destroyed. Once destroyed, the exposed steel will react with oxygen and re-form a passivation film to continue its work. Theoretically, stainless steel pipe fittings will not rust, but in fact, the degree of rust caused by the different dryness and humidity levels of many environments is normal.