Which part of the car uses more springs?

　　(1) I'm sure you've heard the term stainless steel spring, but as you know, stainless steel spring is not only a single stainless steel spring, but also represents more than 100 kinds of industrial stainless steel springs. Each stainless steel spring developed has good performance in its specific application field. The key to success is first to understand the purpose, and then to determine the right steel grade. There are usually only six kinds of steel in the application field of building construction. They all contain 17-22% chromium, and the better steel also contains nickel. The addition of molybdenum can further improve the atmospheric corrosiveness, especially the resistance to chloride atmosphere.

　　(2) the corrosion resistance of stainless steel spring depends on chromium, but because chromium is one of the components of steel, the protection methods are different. When the chromium content reaches 10.5%, the atmospheric corrosion resistance of stainless steel spring increases significantly, but when the chromium content is higher, although the corrosion resistance can still be improved, it is not obvious. The reason is that when the steel is alloyed with chromium, the type of surface oxide is changed to the surface oxide similar to that formed on pure chromium metal. This tightly adherent chromium rich oxide protects the surface from further oxidation. The oxide layer is very thin, through which the natural luster of the steel surface can be seen, making the stainless steel spring have a unique surface. Moreover, if the surface layer is damaged, the exposed steel surface will react with the atmosphere for self repair, and thepassivation film" will be formed again to continue to play a protective role. Therefore, all stainless steel springs have a common characteristic, that is, the chromium content is more than 10.5%.