... 3.Certification:ISO9001:2008,TUV 2010, PED20 Carbon Steel Forged HDPE Flange:1.Type:Alloy flange2.Material:Alloy steel3.Certification:ISO9001 ... ,PN1.0,PN1.6,PN2.5,PN4.0,PN6.3,PN10.0,PN16.0Mpa,PN2.0,PN5.0,PN11.0,PN15 ... . Forging 5. Heat Treatment 6.Cutting7. Inspection Carbon Steel Forged HDPE Flange