Applications of stainless steel in acetic acid and formic acid

Austenitic stainless steel in acetic acid usually have good corrosion resistant force, but cannot be used in martensite and ferrite stainless steel containing acetic acid, in most cases the austenitic stainless steel is completely at room temperature for hangzhou all the concentration of acetic acid corrosion. At higher temperatures, 316L stainless steel, 317L stainless steel is more resistant to acid corrosion than other austenitic stainless steel.

304 stainless steel and 347 stainless steel are used for equipment such as acetators, pipes, pumps, valves, etc., but the fractionating tower material is the best use of 316L stainless steel, which is also used for cold treatment of glacial acetic acid. No stainless steel can adapt to the corrosion of ice acetic acid at the boiling temperature and the temperature of the superheated steam.

The reductant, such as the formic acid, occurs in the form of impurities in acetic acid, causing further corrosion of stainless steel, especially in high temperature. On these occasions, the use of molybdenum stainless steel is the most widely used. The presence of ionized halogens in acetic acid is also harmful.

The formic acid is a good reducing agent, and it is very serious at any temperature against martensitic and ferrite stainless steel. At room temperature, any austenitic stainless steel container can safely store the formic acid. At higher temperatures usually need to use 316 stainless steel and 316l stainless steel, these two kinds of stainless steel has been used for fast curing device and a separate formic acid distillation unit or formic acid distillation unit of mixed with other organic substances.

Source: China Pipe Fittings Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)

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