Why does the stainless steel heating tube rust?

- Jun 17, 2019-

Many people don't understand why stainless steel heating tubes rust. There are several reasons for this:


1. The first possibility is that the manufacturer uses stainless steel 201 to impersonate stainless steel 304 as an electric heating tube; stainless steel 201 material may cause rust due to the different nickel content.


2. If it is indeed stainless steel 304 material, it can be explained as follows:


Stainless steel does not rust under normal conditions. However, when it is exposed to chlorine or harsh environments, especially if the passivation layer on the surface is mechanically or chemically damaged, it is easier to rust than usual, so in this environment. It is easier to rust. The surface of the stainless steel products we usually use is passivated, and the thickness of the chrome oxide film on the surface is much thicker than that of the natural oxide film formed on the fresh surface. Therefore, the stainless steel heating tube will also rust.