As the “invisible guardian” in the field of high-pressure sealing, metal ring gaskets not only have common high-temperature and high-pressure resistance characteristics, but also many details that are easily overlooked are worth exploring.
For example, there are corresponding rules for material selection:
1. Hardness matching
The material hardness of the octagonal gasket must be 15-20HB lower than the flange surface, otherwise it will scratch the flange groove during installation and damage the sealing performance. For example, stainless steel flanges are usually paired with soft iron or low-carbon steel gaskets, while titanium alloy flanges require customized low hardness coatings (such as nickel based transition layer+ceramic surface layer) to avoid galvanic corrosion and ensure fit.
2. Protection in Extreme Environments
Ultra low temperature scenario: In liquid oxygen and liquid nitrogen equipment, aluminum gaskets can maintain elasticity at -196 ℃ due to their high coefficient of thermal expansion, while stainless steel gaskets may fail due to cold brittleness.
Strong corrosive medium: 316 stainless steel gaskets containing molybdenum can resist hydrochloric acid corrosion, while titanium alloy gaskets need to be equipped with insulation coatings (such as Al ₂ O3/TiO ₂ composite coatings) to prevent galvanic corrosion with copper alloys and carbon steel flanges.
There are many types of RTJ gaskets, including R Gasket,RX Gasket,BX Gasket, SBX Gasket,IX Gasket,flange connections,and various customized products.We will do more sharing about ring joint gasket.