Brief introduction: 

 Flanges are also known as blind flanges and blind flanges. It is a flange without a hole in the middle, which is used to seal the pipe plug. The function is the same as that of the welding cap and the wire buckle tube cap, but the blind plate flange and the wire buckle tube cap can be removed at any time, but the welding cap cannot. 

 Production materials: 

 Carbon steel (carbon steel): ASTM A105,20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F 56. F60, F65, F70; 

 Stainless steel (stainless steel): ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8; 

 Alloy steel (alloy steel): ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2M O1, A335P22, St45.8/III; 

 Production standards: HG/T20592-2009, HG/T20615-2009, GB/T9123.1-2000, GB/T9123.2-2000, GB/T9123.3-2000, GB/T9123.4-2000. 

 Detailed introduction: 

 Flanged cover (BL) sealing surface: plane (FF), protrusion surface (RF), convex surface (MFM), tenon groove surface (TG) ring, connection surface (RJ) Production materials: carbon steel, stainless steel, alloy steel. 

 Specification: 1/2′′～80′′(10-2000) Pressure level: 0.6Mpa～32Mpa, 150Lb～2500Lb, PN0.25-PN42.0 Material: 20#, 304, 304L, 321, 316, 316L, 310 Common standards for various materials such as S: 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, 20K (PL, SO, BL, WN, TH, S W) German standard: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543 Flange connections are important connection methods for pipeline construction. 

 Flange connection is to fix two pipes, fittings or equipment on a flange plate first. Between the two flange plates, add a flange pad, and tighten them together with bolts to complete the connection. Some pipes and equipment have their own flange plates, which also belong to the flange connection. 

 The flange is divided into thread connection (thread connection) flange and welding flange. Low-pressure small-diameter has wire flanges, and high-pressure and low-pressure large-diameter welding flanges are used. The thickness of the flange of different pressures and the diameter and number of connecting bolts are different. 

 According to different levels of pressure, flange mats also have different materials, from low-pressure asbestos mats, rubber mats, high-pressure asbestos mats to metal mats. 

 The flange connection is easy to use and can withstand greater pressure. 

 In industrial pipelines, flange connections are widely used.