There are three types of carbon steel flange sealing surface, which are:
1, tenon sealing surface: suitable for flammable, explosive, toxic media and high pressure occasions.
2, plane sealing surface: suitable for pressure is not high, non-toxic medium occasions.
3, concave and convex sealing surface: suitable for slightly higher pressure occasions.

Carbon steel flange gasket is a kind of ring which can produce plastic deformation and has certain strength. Most of the gaskets are cut down from non-metallic sheets, or manufactured by professional factories in accordance with the regular scale, the data are asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc.; Also useful thin metal plate (iron sheet, stainless steel) asbestos and other non-metallic materials wrapped up made of metal gasket; There is also a kind of wraparound gasket made of thin steel belt and asbestos belt together. General rubber gasket is suitable for the occasion of temperature below 120℃; Asbestos rubber gasket is suitable for the water vapor temperature is less than 450℃, the oil temperature is less than 350℃, the pressure is less than 5MPa occasions, about the general corrosive medium, commonly used is acid resistant asbestos plate. In the high pressure equipment and pipeline, the choice of copper, aluminum, no. 10 steel, stainless steel made of lens type or other shape of metal gaskets. The touch width of high-pressure gasket and sealing surface is very narrow (line touch), and the processing finish of sealing surface and gasket is high.
Carbon steel flange in order to avoid the appearance of rust, cracks, etc., the general situation will be in the appearance of carbon steel flange coating (yellow zinc, white zinc, etc.), or brush anti-rust oil and spraying anti-rust paint processing.