Application and structural characteristics of the valve expansion joint

Application and structural characteristics of the valve expansion joint
Valve expansion joint is not sprayed, basically has produced the consensus. After spraying, it is likely to be confused with galvanized steel pipe or galvanized steel pipe sub. Stainless steel plate is stainless steel plate, spraying mainly because of rust resistance, corrosion, leaching, etc., carbon steel and some other materials to paint. Valve expansion joint with excellent resistance to air oxidation, acid salt, heat-resistant characteristics, heat-resistant seamless steel pipe is commonly used in the production of electric heater tube and other places.
Valve expansion joint to enhance the composition of carbon, because of its solid solution strengthening effect to enhance the strength, valve expansion joint composition characteristics of chromium, nickel as the basic increase of molybdenum, tungsten, niobium and titanium and other elements, because its structure for the body of the core structure, so at high temperatures under the high hardness and stress relaxation compressive strength. Valve expansion joint and other raw materials, process performance key involves the following 3 levels: solubility point, specific heat, heat transfer coefficient and thermal expansion coefficient and other thermal properties, resistance, electrical conductivity and permeability and other electromagnetic field theoretical properties, and its Chen elastic mold, stiffness index and other physical properties.
Acidic water is much more acidic and alkaline than the usual body of water, this kind of water with magnesium hydroxide for the valve expansion joint corrosion hazard is particularly high. Salt moisture water in the corresponding level above causing damage to the surface passivation treatment film of the valve expansion joint, thus causing the leaching of the valve expansion joint. Pin acid is mainly harmful to the valve expansion joint internal intergranular structure, higher ambient temperature and higher concentration of nitric acid for the valve expansion joint corrosion is very obvious.