1.Type:Carbon Steel 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, PED20MainMaterialStainless steel,Carbon steel,Alloy steelWN/BL/PL/SO/SW/THANSIANSI B16.5 B16.47 API-605,6A,6B,MSS Sp44, AWWA S207DINDIN2527,DIN2566,DIN2573,DIN2576,DIN2641,DIN2642, ...