What is the real reason for the high temperature resistance of stainless steel welded pipes?

Stainless steel welded pipe is characterized by high temperature resistance and corrosion resistance. What is the reason for the high temperature resistance of stainless steel welded pipe ?

　　The corrosion resistance and heat resistance of high temperature resistant stainless steel welded pipes depend on chromium, but since chromium is one of the components of steel, the high temperature stainless steel welded pipe is not the same. When the amount of chromium added reaches 10.5%, the atmospheric corrosion resistance of the steel is significantly increased, but the chromium content is high, but the corrosion resistance is still improved, but it is not obvious. The reason is that the steel treated with chrome alloy, the surface of the high temperature resistant stainless steel tube is oxidized to form an oxide similar to that formed on the surface of pure metallic chromium. This tightly adhering chrome oxide protects the surface from further oxidation. The oxide layer is very thin, through which you can see the natural luster of the steel surface, making the high temperature stainless steel tube have a unique surface. Moreover, if the surface is damaged, the exposed steel surface of the high temperature resistant stainless steel welded pipe and the atmosphere react to self-repair, forming a "membrane" and continuing to play a protective role.