Can 2205 or 2507 duplex steels resist corrosion by 17% hydrochloric acid at a temperature of around 80 degrees?

This won’t work; I’ve conducted experiments on this topic. I recommend that you read a paper titled \"Study on pitting and repassivation behavior of stainless steel\"

Upstairs, where is the paper you recommended? ? ?

This post was last edited by Wang Genrong on 2017-3-5 at 08:55. It is recommended to use graphite-based chemical processing equipment, such as graphite heat exchangers, graphite packed towers, graphite falling film absorbers, graphite reactors, and graphite pipes. Graphite materials can be used for extended periods at boiling conditions in hydrochloric acid of any concentration without experiencing corrosion. - - - - - - - - -

Is it necessary to use 2205 or 2207? There are many materials to choose from under these conditions!

Duplex steel doesn’t work either. A month later, you won’t even be able to find the dust!

2205 cannot be used under these operating conditions. Here are some data sheets on the chloride corrosion resistance of 2205; they relate to different operating conditions – the corrosion parameters apply to a hydrochloric acid concentration of 1%, and it is likely that 2205 will not work if the concentration is 10%.

This post was last edited by Wang Genrong on 2022-3-24 at 16:41. It seems that the use of graphite-based chemical equipment is the appropriate choice in conditions of high temperature and high chloride ion corrosion, such as graphite heat exchangers, graphite packed towers, graphite falling film absorbers, graphite reactors, graphite pipes, etc. Graphite materials can be used for extended periods at boiling conditions in hydrochloric acid of any concentration without experiencing corrosion.

I’ve seen graphite heat exchangers; they seem to be quite expensive. I heard that they have good temperature and pressure resistance, as well as excellent heat transfer properties.

In fact, the price of chemical equipment made from graphite is not as high as some people think. For example, the price of graphite heat exchangers is roughly similar to that of 316 stainless steel heat exchangers; typically, the price of graphite heat exchangers ranges from 800 yuan/m2 to 1800 yuan/m2, although higher-quality ones can cost over 2000 yuan/m2. The typical pressure tolerance is between -0.099 MPa and 0.6 MPa; if a value higher than 0.6 MPa or even 1.2 MPa is required, it simply needs to be specified at the time of ordering ； The operating temperature range is from -35 degrees to 200 degrees; it can also be used for gas condensation or cooling when the gas temperature is between 200 and 500 degrees. Of course, special structural designs are required for use at such high temperatures, and all of these details must be discussed in advance and specified during the contract signing process.