carbon steel flange ISO Ctification Standards:ANSI,DIN,JIS,GB,BS special design available size:10~6000mm carbon steel square flangeSTANDARDS:. ANSI B16.5 ... 5K, 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 ... contact us, I'll reply you in 24 hours stainless steel wn flange