Metal ring gasket by forging and heat treatment and then made of mechanical processing, is a kind of used in oil and gas pipe flanges, pressure vessels, high-speed joint surface, high temperature and high pressure valve cover metal sealing gasket, especially pressure, temperature fluctuations of the occasion, can still maintain good sealing. The commonly used R type is divided into oval type or octagonal type according to cross section. The standard R type ring gasket is manufactured according to API6A and ASMEB16.20 standard size, and the maximum service pressure is 10000PSI. Octagonal pads are interchangeable with elliptical pads in trapezoidal slot flanges. The RX type is suitable for pressure-enhanced standard R-type ring gaskets and is suitable for R-type flange groove sealing surfaces. Type BX is suitable for pressure enhancement and is designed for applications up to 15000PSI pressure systems. There are a variety of materials and forms suitable for different design and operation requirements. Product type octagonal HS8581 oval HS8582 Performance parameters metal ring pad material maximum hardness code maximum use temperature (℃) steel standard HBSHR B pure iron GB/T 9971 9056D54010GB/T 69912068S5401Cr5MoJB 472613072 F56500Cr13JB 4726GB/T pure iron chemical composition CSiMnPS ≤ 0.05%≤ 0.40%≤ 0.60%≤ 0.035%≤ 0.040% use temperature 540 over ℃ negotiated with manufacturer.