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The abbreviation of SO flange is flat, or can be called take welding flanges. The first step of SO flange with the connection of pipelines is insert the pipe into the inner holes of flange to proper position, then take welding, its advantage the assembling of SO flangewill be more easy, and with cheaper price, thus SO flange has been widely used. The intensity of the internal pressure calculation of SO flange is about two thirds of the corresponding SO flange ,and the fatigue life is about one thirds of the corresponding SO flange So, SO flange only can apply to the circumstances of low pressure level, pressure fluctuations, vibration and shocks which are not serious piping system. SO flange can be divided into belt neck flat welding flanges and flat plate welding flange in detail. SO flange is the kind of flange that connects pipe and equipment through the fillet weld. It is suitable for nominal pressure that shall not exceed the carbon steel pipe connection 2.5 MPa. The sealing surface of SO flange can be made into3 kinds: smooth type, the concave-convex type and tongue and groove type. The characteristics of SO flange are beautiful shape, the smooth surface, acid and alkali resistant, corrosion resistant, strong texture performance. The using amount of smooth type SO flange is the biggest. It is used by media condition in mild conditions, such as low voltage the purification compressed air, low-pressure water circulating. Besides; the most prominent feature is the price of it is quite cheap.