Material selection for hydrogen peroxide equipment
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27.5% hydrogen peroxide; I can use 304 as well as 321. Why does everyone recommend 321 in such cases? Sure, 304 works just fine too, right? No leakage, no corrosion
304 has relatively poor resistance to intergranular corrosion; when used in corrosive environments, problems can occur at the welds. It is generally advisable not to use 304 in applications where corrosion resistance is required – at least 304L, the low-carbon variant, should be used instead. 321 is not bad either
The parts in our device that are involved with or come into contact with hydrogen peroxide use 321 material, while the other parts use 304L material
321 has better corrosion resistance, especially under long-term service
Use stable stainless steel. The effect of 304 is not very good
A steel-lined PP option can be used; it is relatively inexpensive.