... Flange 2.Material:Carbon steel 3.Certification:ISO9001:2008,TUV 2010, PED20 Weld Neck Carbon Steel Flange:1.Type:Carbon Steel Flange2. ... Material:Carbon steel3.Certification:ISO9001:2008,TUV 2010, ... PED20 MainMaterialStainless steel,Carbon steel,Alloy steelWN/BL/PL/SO/SW/THANSIANSI B16. ...