What materials are used to manufacture auxiliary sealing rings under high pressure
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The aforementioned materials are only suitable as auxiliary sealing rings for use under normal operating conditions. Under high pressure, especially when high pressure and high temperature are present simultaneously, they are not suitable; in such cases, metal materials must be used for fabrication. Different metal materials are available for selection depending on the working conditions. Under high pressure, the common materials for metal \"O\"-rings are Cr18Ni9, Cr18Ni12Mo2Ti, 1Cr18Ni9Ti, and Cr18N11Nb, etc. For metal seals with a triangular cross-section, chromium steel such as 0Cr13 is commonly used. As for flat gaskets, copper or aluminum gaskets are frequently employed. Under high pressure and high temperature conditions (such as above 400°C), the strength and elastic modulus of the aforementioned materials decrease significantly; therefore, heat-resistant alloys such as Inconel or chromium-nickel-iron alloys type X should be used. In addition to the auxiliary sealing rings made of a single material discussed in the preceding sections, there are also sealing rings made of composite materials. For example, stainless steel coated with polytetrafluoroethylene, rubber coated with polytetrafluoroethylene, etc., have great potential for use due to their excellent sealing properties.
Common metal materials used for manufacturing auxiliary sealing rings under high pressure include Cr18Ni9, Cr18Ni12Mo2Ti, 1Cr18Ni9Ti, and Cr18Ni11Nb, among others. Metal sealing rings with a triangular cross-section are usually made of chromium steel such as 0Cr13, while flat gaskets are often made of red copper or aluminum. Under high pressure and high temperature conditions, heat-resistant alloys such as Inconel or chromium-nickel-iron alloy-X can be used. There are also sealing rings made from composite materials such as stainless steel coated with polytetrafluoroethylene, and rubber coated with polytetrafluoroethylene. .