Corrosion-resistant stainless steel pumps are corrosion-resistant pumps made of stainless steel stamped with flow parts, and are mainly used for the transportation of corrosive liquids. However, many variable factors represent the characteristics of the corrosive medium, that is, the chemical product and its concentration, atmospheric state, temperature, and time. Therefore, if the correct nature of the medium is not understood, it is difficult to use and select materials. However, the following can be used as a guide for selection:
Type 304 widely used material. It can withstand general rust in the building, resist the erosion of food processing media (but corrosion may occur in high-temperature conditions containing concentrated acids and chlorides), and resist organic compounds, dyes and a wide variety of inorganic compounds. Type 304l (low carbon), good resistance to nitric acid, and durable for medium temperature and concentration of sulfuric acid, widely used as liquid gas storage tanks, used as low-temperature equipment (304n), appliances and other consumer products, kitchen equipment, hospital equipment, transportation Tools, wastewater treatment equipment.
Type 316 contains slightly more nickel than type 304, and contains 2%-3% molybdenum. It has better corrosion resistance than type 304, especially in the chloride medium that tends to cause pitting corrosion. Type 316 has been developed as a sulfite pulp machine because it is durable in sulfuric acid compounds. Moreover, its use has expanded to handle many chemicals in the processing industry.
Type 317 contains 3%-4% molybdenum (the higher level obtained in this series), and contains more chromium than Type 316, which has higher resistance to pitting and crevice corrosion.
Type 430 has a lower content of alloy than type 304, and is used for high-polishing decoration purposes in a mild atmosphere. It can also be used as nitric acid and food processing equipment.
Type 410 has the lowest alloy content among the three general purpose stainless steels. It is the choice of high-load bearing parts that require strength and corrosion resistance, such as solid parts. Type 410 is resistant to corrosion in mild atmosphere, water vapor and many mild chemical products.
Type 2205 is superior to Type 304 and Type 316 because it has high resistance to chloride stress corrosion cracking and has approximately twice the strength.
