Although butt-welded flange products have been widely used in our production and life, the standardized manufacture of butt-welded flange started late in China The current situation of butt welded flanges in China is that not only the varieties and specifications are relatively small, but also the production scale is relatively small and the circulation is not smooth

Production and application characteristics of butt welded flange: butt welded flange is easy to connect and can bear relatively large pressure Butt welded flange varies according to different materials of pressure grade From low pressure asbestos pad to high pressure asbestos pad to metal pad In the actual production and development of butt-welded flanges, different methods and processes are adopted to manufacture and follow the process methods and principles, which can produce important values and functions for different aspects Adding some elements in actual production increases the characteristics and value of carbon steel flange, which shows good use characteristics and value Butt welded flange connection is widely used in industrial pipeline Small pipe diameter and low pressure at home can't see the connection of butt welded flange

If you are in the boiler room or production site, there are flanged pipes and equipment products everywhere In the actual production process of butt welded flange, certain technical parameters and requirements are adopted for production and application to ensure correct use and popularization according to certain methods and principles Colleagues adopt certain technological methods and principles for production and welding to ensure the reliable quality of butt welded flanges in use

The product grade and technical requirements of butt welded flange shall conform to the relevant requirements in JB4726-4728 Forgings of carbon steel or austenitic stainless steel with a specified nominal pressure of 0.25 MPa-1. 0 MPa are allowed to be made of Class I forgings Forgings with nominal pressure between 1.6 MPa and 6.3 MPa shall meet the requirements of Class II or above For flange forgings with nominal pressure not less than 10.0 MPa, chromium molybdenum steel forgings with nominal pressure greater than 4.0 MPa, ferritic steel forgings with nominal pressure greater than 1.6 MPa and working temperature not greater than-20 degrees Celsius, such flat welded flange forgings need to meet the relevant requirements of class forgings Butt welded flanges are usually manufactured by forging or forging technology These requirements need to be met if steel plate or section steel is used for manufacturing

Butt welded flanges shall not be delaminated after ultrasonic flaw detection It is necessary to cut the steel into strips along the rolling direction and butt weld them into rings by bending process, and at the same time, the surface of the steel forms an annular cylindrical surface It is impossible to process steel plates into butt welded flanges with necks Full penetration weld should be adopted for butt weld of ring Heat treatment shall be carried out after welding of butt weld of ring, and radiographic or ultrasonic flaw detection shall be carried out at the same time The results of radiographic inspection shall meet the requirements of Class II in JB4730. The ultrasonic inspection results of welded flanges shall meet the requirements of Class I in JB4730