... JIS,GB,BS special design available size:10~6000mm carbon steel square flangeSTANDARDS:. ANSI B16.5/MSS.SP 44,JIS ... 10K, 16K and 20KMaterials:Carbon steel, Stainless steel and Alloy steel etc.Flangethreaded flange,industrial flange,Carbon steel flanges)JIS B 2220Weld neckflange ... standard, JIS B 2220-2004(Steel pipe flanges Use:widely used in Petroleum, Chemical industry, ...