Many factors, gasket installation and material selection

The choice of gasket material depends mainly on the following three factors: temperature, pressure, medium. I. Metal gasket material 1. Carbon steel: The recommended maximum working temperature does not exceed 538 ℃, especially when the medium is oxidized. High quality thin carbon steel is not suitable for use in plants that produce mineral acids, neutral or acidic salt solutions. Equipment suffering from hot water conditions has a very high accident rate if carbon steel is subjected to stresses. Carbon steel gaskets are commonly used for high concentrations of acids and many alkaline solutions. Brinell hardness of about 120. 2.304 stainless steel 18-8 (18-20% chromium, nickel 8-10%), the maximum recommended operating temperature does not exceed 760 ℃. In the temperature -196 ~ 538 ℃ range, prone to stress corrosion and grain boundary corrosion. Brinell hardness 160. 3.304l stainless steel carbon content of not more than 0.03%. Recommended maximum operating temperature does not exceed 760 ℃. Corrosion resistance similar to 304 stainless steel. Low carbon content reduces the precipitation of carbon from the crystal lattice, resistance to intergranular corrosion than 304 stainless steel. Brinell hardness of about 140. 4.316 Stainless steel 18-12 (18% chromium, 12% nickel) adds approximately 2% molybdenum to 304 stainless steel and increases its strength and corrosion resistance as the temperature increases. When the temperature is higher than other ordinary stainless steel creep resistance. Recommended maximum operating temperature does not exceed 760 ℃. Brinell hardness of about 160. 5.316l stainless steel recommended maximum continuous working temperature does not exceed 760 ℃ ~ 815 ℃. Carbon content does not exceed that of 316 stainless steel with better resistance to stress and grain boundary corrosion. Brinell hardness of about 140. 6.20 alloy 45% iron, 24% nickel, 20% chromium and a small amount of molybdenum and copper. Recommended maximum working temperature does not exceed 760 ℃ ~ 815 ℃. Particularly suitable for the manufacture of sulfuric acid corrosion-resistant equipment, Brinell hardness of about 160.