All metals and reaction of oxygen through the atmosphere,  seamless stainless steel pipe it oxide film. Unfortunately, ordinary stainless steel pipe inside the formation of iron oxide on the oxidation continues, the rust carries on expand, eventually forming holes. Your able to use paint or oxidation-resistant metal (eg, zinc, nickel and chromium) plating to ensure the carbon steel surface, but, as people know, this protection is only a film. If for example your protective layer is damaged, in this article steel started rust.
Stainless pipe is dependent upon the corrosion resistance of chromium, but because chromium is an element of steel, consequently the way of protection is not the same.
Add in the number of chromium reached 10.5%, heat exchanger tubes the atmospheric corrosion resistant steel increased significantly, but higher chromium content, although still improve corrosion resistance, even so, not obvious. Because chromium is alloying of steel processing, it oxide resembles your needs change is actually pure chromium metal oxides formed on top. This tight adhesion of a chromium-rich oxide surface protection in order to prevent further oxidation. This thin oxide layer, where by you can view the top of natural sheen of steel, the stainless-steel will have a unique surface. Moreover, in case the damaged surface, the exposed steel surface together with the atmospheric airport terminal self-repair, re-formation with this "passive film", continues to be play a protective role.
Therefore, all s / s employ a common characteristic, namely chromium content of 10.5% plus.
And building construction applications, the steel pipe types are generally only six. They contain 17 to 22% of chromium, a strong steel also includes nickel. annealed tube molybdenum are often offered with further improve the atmospheric corrosion, particularly corrosion resistance to chloride-containing atmosphere.