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Weld Neck Flange


Weld Neck Flange

Weld-neck flange is the most popular flange type for piping system, it is widely used for oil and gas, ship building, chemical engineering, LNG, offshore etc. With a protruding rim around the circumference and the same SCH with pipe, weld neck flange can be welding connect with a stainless steel tubings straightly. Also there is a long type weld neck flange, it is unsuitable for pipes and is used in process plant.

Kaysuns supply both regular type and long type welding neck flange for piping system and energy industries. Stainless steel, duplex steel, nickel based alloy, copper alloy… we are ability to provide various materials to match the different requirement.

Specification of Weld Neck Flange:

Product: Weld Neck Flange
Dimension Range: 1/2” to 72” (DN15 ~DN1800)
Rates/SCH: 150#—2500#,API2000PSI-20000PSI
  • Stainless Steel: ASTM A182 F304, F304L, F304/304L, F316, F316L, F316/FP316L, F317L, F321, F321H, F347, F347H, F51(Duplex Steel), N08904etc.
  • Nickel-based Alloy: Monel 400,Inconel 600,Incoloy 800/H,Alloy 20,Hastelloy C276,C22,B2, Cu70Ni30,Cu90Ni10,Titanium etc.
  • Alloy Steel: ASTM A105, ASTM A182 F11, F12, F22, F5, F91, A350 LF2,LF3, A694 F42, F46, F48, F50, F52,
Standards: ANSI B16.15, ANSI B16.47, MSS SP-44, API6A, API 17D, Manufacturer Standard etc.
Our Strength
  • Fast Delivery
  • Various Materials
  • Full set of swivel ring flange, including gaskets and bolts
  • Customized fabrication available
  • Package supplying of piping materials
  • Overlay process
  • Third party inspection available

① Equivalent from EN/DIN is available for above.
②. The material above is for your reference only. The actual inquiry will consider order quantity and delivery time.
③. If didn’t find your material here, you are kindly requested to make a specific enquiry to [email protected] .


  • Offshore
  • Chemical Engineering
  • Onshore Oil&Gas
  • Paper Plants
  • Fertilizer
  • Environment Engineering
  • Power Project
  • Mining
  • Shipyard
  • Mechanical Manufacture
  • Food & Pharmacy

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