Weld Neck Flange

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N-STEEL provides weld neck flanges in all material grades, specifications and sizes. The size ranges from 3/8" to 160" (DN10~DN4000). This welding neck flange is mainly used for attaching to pipe by welding the pipe to the neck of it. This allows stress transfer from the pipe fitting to the pipe itself, thus reducing high pressure on the neck.

Our weld neck flange features reasonable structure as well as large strength and rigidity that enable it to withstand high temperature, high pressure, alternating bending and temperature fluctuation. In addition, this weld neck pipe flange can produce a reliable sealing effect.

Pressure Rating of Weld Neck Flange
American series: CLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900 and CLASS 1500
European series: PN 6, PN 10, PN 16, PN 25, PN 40, PN 63 and PN 100

Types of Flange Face
American Series: Flat Face (FF), Raised Face (RF), Tongue (T), Groove (G), Female (F), Male (M), Ring Joints Face (RJ)
European Series: Type A (Flat Face), 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)

Available Materials of Weld Neck Flange
Carbon steel: A105
Alloy steel: A182 F1-F2-F5-F9-F91-F1-F12-F22
Stainless steel: A182 304-304H-304L-304N-316-316H-316L-316N-316N-321-321H 347-347H
Low temperature steel: A350 LF2-LF3-LF8
High performance steel: A694 F42-F46-F52-F56-F60-F65-F70

Standards of Weld Neck Flange
GB/T9112-2000,GB/T9115.1-2000, GB/T9115.2-2000, GB/T9115.3-2000, GB/T9115.4-2000, GB/T9124-2000, GB/T13402-1992
SH/T3406-1996
GD2000 GD87-1101
JB/T74-1994, JB/T75-1994, JB/T82.1-1994, JB/T82.2-1994, JB/T82.3-1994, JB/T82.4-1994
HG/T20592-2009, HG/T20614-2009, HG/T20615-2009, HG/T20623-2009, HG/T20635-2009
ASME B16.5-2009, ASME B16.47-2006
API605-1988
MSS SP 44-2006
CSA Z245.12-05-2005
EN1092-1-2007, EN1759-1-2004
DIN2630, DIN2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638
BS1560-3.1-1989, BS4504-3.1-1989
AFNOR NF E29-200-1-2007
ISO7005-1-1992
AS2129-2000
JIS B2220-2004