Knowledge about butt welding flange

Knowledge about butt welding flange

　 Butt-welded stainless steel flanges are a kind of pipe fittings, which refer to flanges with necks and round pipe transitions and butt-welded to the pipe. They are widely used at present. The stainless steel butt welding flange is not easy to deform, has good sealing, and is widely used. It is suitable for pipelines with large fluctuations in pressure or temperature or high temperature, high pressure and low temperature pipelines. The advantage is that the price is relatively cheap, and the nominal pressure does not exceed 2.5MPa; it is also used for transportation On pipelines with expensive, flammable and explosive media, the nominal pressure is around PN16MPa.

The stainless steel butt weld ring loose flange is a movable flange piece, which is generally matched with water supply and drainage accessories. When the factory leaves the factory, there is a flange at each end of the expansion joint, which is directly connected to the pipeline and equipment in the project with bolts . Function The purpose of using butt welding ring loose flange is generally to save material. Its structure is divided into two parts. One end of the pipe is connected to the pipe and the other end is made of a butt welding ring. The flange is made of low-grade materials, and the pipe part uses the same material as the pipe to save material.

International stainless steel flange marking system:

　　 The American Iron and Steel Institute uses three digits to indicate various standard grades of forgeable stainless steel. Among them: Austenitic stainless steel large flanges are marked with 200 and 300 series numbers; ferritic and martensitic stainless steels use 400 series numbers. For example, some of the more popular austenitic stainless steels are marked with 201, 304, 316 and 310; ferritic stainless steels are marked with 430 and 446, and martensitic stainless steels are marked with 410 , 420 and 440C are the marking flags, duplex (austenite-ferrite); stainless steel, precipitation hardening stainless steel and high alloys with iron content less than 50% usually accept patent names or trademark names.

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