Which of 304 stainless steel and 316 or 316L stainless steel is more resistant to acid corrosion?
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Among the three stainless steels, 304 stainless steel and 316 and 316L stainless steel, which one is more resistant to acid corrosion? The acid PH=4； What kind of steel is better for liquids with PH=4?
Thanks for sharing. The specifications here don’t seem to mention the three types of stainless steel: 304 stainless steel, 316 stainless steel, and 316L stainless steel. Which one is more resistant to acid corrosion?
The corrosion resistance of stainless steel must be conditional. It cannot just look at the PH value, but also depends on the specific composition of the medium.
Specific analysis of specific media. It will be different depending on the working conditions.
Mainly H2SO3, HNO3, etc. cause acidity
Both media are media that may cause intergranular corrosion to stainless steel. If welding or hot processing above 400 degrees is required, austenitic stainless steel containing titanium and niobium stabilizing elements and a carbon content greater than 0.03% should be used. It seems 321 is more appropriate. :lol
Generally speaking, among the three materials in the LZ series, 316L should have the best corrosion resistance, but the people above are right. You also need to look at the working conditions in detail. Colleagues who specialize in materials have a book called "Corrosion Data and Material Selection Manual", which should be able to find the answer you want.
316L is better. The storage tank used to store acid (ph3-4) in our factory is 316L.
The version is large. To understand the material selection, you must first know the operating temperature, concentration, acid type, and material selection. It is best to help you confirm the situation. Because you didn't explain the situation clearly...it's hard to help you decide.
At normal temperature and pressure, the acidity caused by H2SO3, HNO3, etc. is almost corrosive to these materials. From actual use experience, which one is better?