Stainless steel flanges are mainly parts that connect pipes to each other. According to structural types, there are integral flanges, loose flanges, and threaded flanges. Common integral flanges include flat welding flanges and butt welding flanges. Flange fittings refer to fittings with flanges (flanges or flanges). It can be cast, threaded or welded. Flange connection refers to a pair of flanges, a gasket, and several bolts and nuts. The gasket is placed between the two flange sealing surfaces. After tightening the nut, the specific pressure on the gasket surface reaches a certain value and deforms, filling the uneven areas on the sealing surface to ensure a tight and leak free connection. Flange connection is a detachable connection. There are holes on the flange that can be threaded with bolts to tightly connect the two flanges, and gaskets are used to seal between the flanges. According to the connected components, it can be divided into container flanges and pipe flanges.

Flange production standards: National standard: GB/T9112-2000 (GB9113.1-2000~GB9123 • 4-2000) American standard: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW) Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW) German standard: DIN2573、2572、2631、2576、2632、2633、2543、2634、2545（PL、SO、WN、BL、TH） Ministry of Chemical Industry standards: HG5010-52~HG5028-58, HGJ44-91~HGJ65-91, HG20592-97 series, HG20615-97 series. Ministry of Machinery standards: JB81-59~JB86-59, JB/T79-94~JB/T86-94, JB/T74-1994 Pressure Vessel standards: JB1157-82～JB1160-82、JB4700-2000～JB4707-2000 B16.47A/B B16.39 B16.48