Introduction to the standard and application scope of plate flat welding flange

Plate flat welding flange is a commonly used flange, which is characterized by convenient materials, simple manufacture, low cost and wide use. The following editor shares the standard and scope of application of plate flat welding flange

Standard for plate flat welding flange:

　　 National standard flange English (National standard flange) refers to the flange sheet produced in accordance with the national standard of the People's Republic of China "GB/T 9112~9124-2010 Steel Pipe Flange". The national standard flange standard was jointly issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the National Standardization Administration of the People's Republic of China on 2011-01-10. It is a recommended standard implemented from 2011-10-01. GB/T 9112~9124-2010 includes the following 13 standards: It replaces the national standard GB/T9112-2000; GB/T10745-1989 standard

　　 GB/T 9112-2010 steel pipe flange types and parameters

　　 GB/T 9113-2010 integral steel pipe flange

　　 GB/T 9114-2010 threaded steel pipe flange with neck

　　 GB/T 9115-2010 butt welding steel pipe flange

　　 GB/T 9116-2010 flat welded steel pipe flange with neck

　　 GB/T 9117-2010 Socket welded steel pipe flange with neck

　　 GB/T 9118-2010 Butt welded ring neck loose sleeve steel pipe flange GB/T 9119-2010 Plate flat welded steel pipe flange

　　 GB/T 9120-2010 Butt weld ring plate loose steel pipe flange

　　 GB/T 9121-2010 Flat welded ring plate loose steel pipe flange

　　 GB/T 9122-2010 Flanged ring plate loose steel pipe flange

　　 GB/T 9123-2010 steel pipe flange cover

　　 GB/T 9124-2010 steel pipe flange

　　Technical conditions The pressure marks specified in this standard are divided into PN marks and Class marks.

PN marked with 12 pressure levels: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400 Class marked with 6 pressure levels: Class 150; Class 300; Class 600; Class 900; Class 1500; Class 2500 The other meaning of the national standard flange is: flanges produced in accordance with the size and tolerance range required by national standards, which are also called flanges that are not produced according to standard sizes Second-standard flanges (someone call non-standard flanges is incorrect), usually some unscrupulous businesses will reduce the flange thickness and outer diameter to save materials, and use waste steel or scrap steel processing method Lan, usually this kind of steel is waste material whose chemical composition and mechanical properties are not up to standard. What's more, the flanges are produced by private steelmaking in black steel plants. The old steelmaking technology used in this private steelmaking cannot guarantee the mechanical properties and welding performance. , It may not be able to be welded to the steel pipe during use, or the steel itself may leak after welding with cracks, pores, etc. Therefore, try to use the national standard flange when purchasing the flange. If you have limited funds to choose the second standard flange, you must carefully observe and measure the flange size to avoid being fooled.

　　Plate flat welding flange application range:

　　Plate flat welding flange has good comprehensive performance, so it is widely used in basic projects such as chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire fighting, electric power, aerospace, shipbuilding and so on.