During production and operation, mechanical equipment will often be exposed to acidic or weakly alkaline chemicals, and even some chemicals that are acids or bases themselves, such as acetic acid, citric acid, malic acid, tartaric acid, lactic acid, butyric acid, fatty acid, hydrochloric acid, soda ash, baking soda, etc. these materials have corrosive effect on many metal materials, while ordinary salt, non acid and non alkali, It also has a corrosive effect on many metals. At the same time, when microorganisms grow and reproduce, they will produce corrosive metabolites.
Stainless steel has high corrosion stability, high mechanical properties, high plasticity and weldability. Therefore, in the mechanical equipment of food and beverage, textile printing and dyeing, environmental protection equipment, refrigeration and other industries, not only the equipment itself is required to be made of stainless steel, but also the corresponding connectors, pipes and containers need to be made of stainless steel. The selected stainless steel materials will vary according to the use environment of mechanical equipment. Generally, austenitic stainless steel is used, such as 304 (L) and 316 (L).