Many people do not understand, obviously buy stainless steel 304 heating pipe why go back to use sometimes also rust it? There may be several reasons for this.
1.The first possibility, the manufacturer uses stainless steel 201 pretending to be stainless steel 304 to do electric heating pipe; stainless steel 201 material due to the nickel content of the composition is not the same, it may cause rust phenomenon.
2. If it is indeed stainless steel 304 material, can be explained as follows.
Stainless steel in general is not rust, but contact with chlorine-containing or harsh environment, especially when its surface passivation layer is mechanically or chemically damaged, it is easier than usual to rust, so it is easier to rust in this environment. We usually use the surface of stainless steel products are passivated, the surface of the chromium oxide film thickness than the fresh surface of the naturally formed oxide film is much thicker, but also dense.
