Welding Neck Flange is kind of Flanges. The neck of flange is for welding to connect the other pipelines.We have many kinds of flat welding flanges, such as ASME B16.5, ASME B16.47, DIN 2634, DIN 2635, DIN 2630, DIN 2636, DIN2631 and DIN 2637 etc. Carbon steel flange is the part for connecting pipe and pipe at pipe end. There are drilling holes on the flange, use bolt to connect two flanges, and use gasket to seal two flanges. Because of its good overall performance, Flange is widely used in such basic projects as chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, freezing, sanitary, plumbing, fire protection, electricity, aerospace and shipbuilding. Standard: DIN2630 to DIN2635 Sizes: According to the standard Pressure: PN2.5 to PN64 Material: Carbon steel or other required material Surface: Original Color, Galvanizing or Paiting as clients requirements. Packing: Wooden Cases