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Acidic services can be taken into 2 basic categories: minimizing acids, such as hydrochloric acid and water down sulfuric acid, and oxidizing acids, such as nitric acid and concentrated sulfuric acid. Increasing chromium and molybdenum content offers increased resistance to decreasing acids while increasing chromium and silicon content provides increased resistance to oxidizing acids.

At room temperature level, Type 304 stainless-steel is only resistant to 3% acid, while Type 316 is resistant to 3% acid as much as 50 C (122 F) and 20% acid at room temperature. Therefore Type 304 SS is hardly ever used in contact with sulfuric acid.  View Details  and Alloy 20 are resistant to sulfuric acid at even greater concentrations above space temperature level.

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At high concentrations and raised temperature levels, attack will occur, and higher-alloy stainless steels are required. In general, natural acids are less destructive than mineral acids such as hydrochloric and sulfuric acid. As the molecular weight of natural acids boosts, their corrosivity decreases. Formic acid has the least expensive molecular weight and is a weak acid.

Type 316 is commonly utilized for keeping and handling acetic acid, a commercially important natural acid. Type 304 and Type 316 stainless steels are unaffected by weak bases such as ammonium hydroxide, even in high concentrations and at heats. The very same grades exposed to more powerful bases such as sodium hydroxide at high concentrations and heats will likely experience some etching and splitting.

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Organics [edit] All grades withstand damage from aldehydes and amines, though in the latter case Type 316 is more effective to Type 304; cellulose acetate damages Type 304 unless the temperature level is kept low. Fats and fats just impact Type 304 at temperatures above 150 C (302 F) and Type 316 SS above 260 C (500 F), while Type 317 SS is untouched at all temperatures.