The Stainless Steel Flange Has Poor Corrosion Resistance in The Acid-base Environment

The stainless steel flange has poor corrosion resistance in the acid-base environment For the connection form of containers and process pipes, mainly to stainless steel flange connection, however, in order to manufacturers always want to reduce production costs, so the use of stainless steel flange is very careful. Because of the process requirements of flange connection to consider the convenience of manufacturing, transportation, installation and maintenance, the connection of containers and process pipes often adopts removable structure, namely stainless steel flange connection, it has good connection strength and tightness, and a wide range of applicable sizes. Therefore, the stainless steel flange connection is widely used. However, stainless steel flanges are not irreplaceable. For example, in the strong corrosive container or pipe connection, if the use of stainless steel flange it is poor corrosion resistance, not suitable for strong acid and alkali environment, so we must use a more appropriate flange connection, that is the carbon steel flange. Because stainless steel flange has obvious deficiencies compared with carbon steel flange, here to share with you: in the vacuum salt making enterprises, because the medium in the container and pipeline is sodium chloride solution (i. e., brine), has a strong corrosive. Although the carbon steel flange has high strength and good plasticity and toughness, but the corrosion resistance is poor, generally used after a month will appear a large area of corrosion phenomenon, six months after a large area of perforation, resulting in medium leakage. If using stainless steel flange ① is more expensive, stainless steel flat welding flange is about 3~5 times the carbon steel flange; ② is welding technology is relatively demanding. If the welding is not good, easy to cause weld crack; ③ is currently used stainless steel flange because the presence of titanium carbide in steel will reduce the material plasticity, toughness and stamping performance, the use is not easy to cause flange fracture. Therefore, for how to choose what flange connection, to combine the situation at that time, the purpose is to correctly use flange connection correctly, ensure production cost and service life, so that reflect the advantages of stainless steel flange.