Product application of necked butt-welded steel pipe flange flat-welded flange 

 Applicable standards for butt-welded steel pipe flanges with neck: Ministry of Chemical Engineering HG20594-1997, national standard GB/T9116.1-2000-GB/T9116.4-2000, American standard ANSIB16.5, Ministry of Chemical Industry HG20616-1997, national standard GB/T91 16.1-2000—GB/T9116.4-2000. 

 Flange type: flat welding flange, butt welding flange, loose sleeve flange, plug-in welding flange, threaded flange 

 Sealing surface type: full plane, convex surface type, concave and convex surface type, tenon groove surface type, ring sealing surface type 

 Executive standards: national standard, American standard (ANIS), Japanese standard (JIS), British standard (BS), German standard (DIN), etc. 

 Product material: carbon steel, stainless steel, alloy steel 

 Product use: petroleum and gas pipeline engineering, natural gas pipeline engineering, chemical plants, power plants, shipyards, pharmaceuticals, dairy products, beer, beverages, water conservancy, etc. 

 Note: Carbon steel: 20#, A3, 20G, 16Mn, ASTM A234, ASTM A105, etc. Stainless steel: ASTMA403, 1Cr18Ni9Ti, 0Cr18Ni9, 00Cr19Ni10, 00Cr17Ni14Mo2, 304, 304L, 316, 316L, etc. 

 Alloy steel: 16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910, 15CrMo, 12Cr2Mo1, A335P22, St45.8/III, A10bB