Ring joint gaskets are manufactured by solid materials through forging,heat treatment, high-precision processing by CNC lathe according to ASME B16.20 and API 6A standard,also can be produced by drawing and other special request . It is available in R,RX,BX styles, and R type can be manufactured into oval and octagonal cross section,it is primarily used in oil, gas and petrochemical, offshore oilfield industries,such as valve,flange,pipework assemblies,high integrity vessel joint and so on , applicable to a variety of high-temperature ,high pressure,corrosive work conditions.