The choice of gasket material mainly depends on the following three factors: temperature pressure medium
1. Metal gasket material
1. Carbon steel: recommended maximum working temperature does not exceed 538 ℃, especially when the medium with oxidizing.High quality thin carbon steel is not suitable for manufacturing inorganic acid, neutral or acidic salt solutions. If the carbon steel is subjected to stress, the equipment accident rate under hot water conditions is very high.Carbon steel gaskets are commonly used in high concentrations of acid and many alkali solutions.Brinell hardness is about 120.
2. 18-8-304 stainless steel, nickel chromium (18-20% 8-10%), the recommended maximum working temperature does not exceed 760 ℃.- 196 ~ 538 ℃ in the temperature range, prone to stress corrosion and intercrystalline corrosion.Brinell hardness 160.
3.The carbon content of 304L stainless steel does not exceed 0.03%.Recommended maximum working temperature does not exceed 760 ℃.Corrosion resistance is similar to 304 stainless steel.Low carbon content reduces the carbon from crystal lattice, and the corrosion resistance of grain boundary is higher than 304 stainless steel.Brinell hardness is about 140.
4.316 stainless steel 18-12 (chromium 18%, nickel 12%), increased about 2% molybdenum in 304 stainless steel when the temperature increased its strength and corrosion resistance.The creep resistance of stainless steel is higher when the temperature is raised.Recommended maximum working temperature does not exceed 760 ℃.Brinell hardness is about 160.
5.316 l stainless steel is recommended maximum continuous working temperature does not exceed 760 ℃ ~ 815 ℃.The carbon content does not exceed that of 316 stainless steel with better stress resistance and grain boundary corrosion.Brinell hardness is 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 ℃.Especially suitable for manufacturing sulphuric acid corrosion resistant equipment, brinell hardness about 160.
7.Aluminium and aluminium (content not less than 99%).Aluminum has excellent corrosion resistance and processing properties and is suitable for manufacturing double - clamp gasket.Brinell hardness about 35.Recommended maximum continuous working temperature does not exceed 426 ℃.