Pressure American Series: CL _ASS 150, CL ASS 300, CL ASS 400, CLASS 600, CL ASS 900, CLASS 1500 European Series. PN 6,PN 10,PN 16,PN 25, PN 40,PN 63,PN 100 Flange Facing Types American Series: Raised Face(RF), Tongue(T), Groove(G), Female(F), Male(M), Ring Joints Face(RJ) European Series: Type B(Raised Face), Type C(Tongue), Type D(Groove), Type E(Spigot), Type F(Recess), Type G(O- Ring Spigot), Type H (O-Ring Groove) Materials Carbon Steel: ASTMIASME A105, ASTMIASME A516 Grade 55-60-65-70 Alloy Steel: ASTMIASME A182 F1-F12-F11-F22-F5-F9-F91-F911-F92 Stainless Steel: ASTMIASME A182 F304-F304H-F304L -F304N-F304LN F316-F316H-F316L -F316N-F316LN F321-F321H F347-F347H, ASTM/ASME A182 F51-F52-F53-F54-F55-F60-F61 Low-Temperature Steel: ASTMIASME A522. ASTMIASME A707 Grade L1-L2-L3-L4-L5-L6-L7-L8 High-Strength Steel: ASTMIASME A694 F42-F46-F48-F50-F52-F56-F60-F65-F70 Standards ASME B16.5-2013 EN 1092-1-2007, EN 1759-1-2004 ISO 7005-1-1992 GB/T 9112-2010, GB/T 9117-2010 HG/T 20592-2009, HG/T 20615-2009 SH/T 3406-2013 GOST- AFNOR- BS- DIN Industrial Processes Die forging, Machining Industries Served Power generation, petroleum, natural gas, chemical, shipbuilding, heating, papemaking, metallurgy As a foremost socket weld flange manufacturer in China, we at Ahad adopt a strict quality control system to ensure good quality. Our industrial flanges have been certified by ISO 9000, Pressure Equipment Directive 97/23/EC (PED 97/23/EC), AD2000 Merkblatt WO, and API. They are widely used in many countries, for example Italy, Germany, Spain, France, Russia, the United States, Brazil, Iran, India, and so on. For a complete list of industry pipe fttings, please see our product page!