Why does the stainless steel 304 pipe rust?

- Apr 13, 2019-

Many people think that stainless steel 304 is not rusting, and rust is caused by unqualified quality. In fact, this is a misconception that stainless steel 304 lacks understanding. Stainless steel 304 will also rust under certain conditions.

First, the presence of fluoride ions in the environment

Fluoride ions are widely present, such as salt, sea water, sea breeze, soil, and the like. Stainless steel in the presence of fluoride ions, corrosion is very fast, even more than ordinary low carbon steel.That is to say, the stainless steel 304 does not substantially corrode and rust, but if it encounters a large amount of fluoride ions, it will still rust, and in general, the corrosion rate of the article under the sealing condition is greater than that in the open environment. If the items are spliced from sheets, the corrosion rate at the splicing will be greater than the corrosion rate in the rest.So if the device is in a fluoride-rich environment, you can change the material of the device.

Second, no solution treatment

After the stainless steel 304 tube is processed by drawing and bending, the surface passivation film and the internal crystal structure of the tube have been destroyed; if it is not treated by pickling or the like, it will be oxidized and rusted.

So when using stainless steel 304 tube, you need to pay attention to the following points:

1, try to prevent the appearance of scratching

2, keep the pipe clean

3. Avoid long-term pipe in an acid-containing salt environment.