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What kind of material is 904L alloy? Which acids can it resist?
It is acid-resistant stainless steel, capable of withstanding dilute acids at 90 degrees.
Quoting what friend HaiChuan678 said: Both 304 and 316 are austenitic stainless steels, and materials containing chloride ions are highly corrosive to austenitic stainless steels; therefore, 304 and 316 are not suitable for your application. There is a type of stainless steel called 904L; its equivalent domestic grade is 00Cr20Ni25Mo4.5Cu. It features a high chromium content and sufficient nickel content, while the presence of copper endows it with strong acid resistance. It exhibits high resistance to chloride intergranular corrosion and stress corrosion cracking, and its pitting resistance is slightly better than that of other steel grades. But this type of steel is too expensive. It is recommended to use a rubber lining. Here is an excerpt from the \"Corrosion Data and Material Selection Handbook\" on materials suitable for use with hydrochloric acid, for your reference.
It is a grade designated by the American Society for Materials and Science; it belongs to the 20-25 series of stainless steels. It contains 3% more copper than 00Cr25Ni20, which enhances its resistance to sulfide corrosion. However, this also increases the tendency for thermal cracking. Welding is carried out using E-386 welding rods from the Swedish company Isabell, but these rods are expensive. The new grade is 015Cr21Ni26Mo5Cu2, a super austenitic stainless steel with excellent corrosion resistance