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Weld Neck Flange

Weld neck flange features high deformation resistance, great sealing performance, wide application range, good rigidity, resilience and reasonable thinning transition for butt welding. Distant from the welding seam, the adjoining face won’t deform due to high welding temperature. Hence, the flange is suitable for pipelines with large change of pressure and temperature or tubes with high temperature, high pressure or low temperature. Generally, the product is used for connection between pipes with valves where the working pressure is larger than 2.5Mpa. It is also applied on pipelines for transportation of expensive, inflammable and explosive matter. Produced by unique production process, our flange has long neck, which leads to high price. However, it can be used in high-pressure situations. During butt welding, the tensile stress that the neck or the concentrator imposes on the hub plays an important role of strengthening the flange. The flange hole can perfectly match with corresponding pipe hole, thus alleviating turbulence and erosion.

Available Sizes
3/8"~160",  DN10~DN4000

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
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
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
JIS B2220-2004

Raw Materials
Carbon steel: A105
Alloy steel: A182 F 1-F 2-F 5-F 9-F 10-F 91-F 92-F 122-F 911-F 11-F 12-F 21-F 22
Stainless steel: A182 304-304H-304L-304N-304LN 316-316H-316L-316N-316LN 321-321H 347-347H
High-temperature steel: A522 A707 Grade L 1-L 2-L 3-L 4-L 5-L 6-L 7-L 8
High-performance steel: A694 F 42-F 46-F 48-F 50-F 52-F 56-F 60-F 65-F 70

Pressure Grade
American System: CLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900, CLASS 1500
European System: PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100

Flange Facing
American System: Flat Face (FF), Raised Face (RF). Tongue Face (T), Groove Face (G), Female Face (F), Male Face (M), Ring Joints Face (RJ)
European System: Flat Face, Raised Face, Tongue Face, Groove Face, Female Face, Male Face, Ring Joints Face.

Producing Process
Cutting of Raw Material --- Die Forging --- Machining

The flange is widely used in many areas such as power generation plant, petroleum industry, natural gas system, chemical industry, shipbuilding industry, heating system, paper-making industry, metallurgy industry, etc.

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