Weld neck flange also called WN flange, is a flange with a neck butt welded to the pipe. Weld neck flange is not easy to be deformed, well sealed, and widely used. Weld neck flange is suitable for pipelines with large fluctuations in pressure or temperature or pipelines with high temperature, high pressure≤25.0Mpa and low temperature. It is also used for conveying expensive, flammable and explosive media on the pipeline with nominal pressure around PN16MPa. The sealing surface of weld neck flange is RF, MFM and TG.

As the professional weld neck flange, We can produce the speical size weld neck flanges according to customers’drawings or designs.

The description of weld neck flange as below:

1. Weld Neck Flange Size: 1/2″-60″(DN10-DN1500)

2. Weld Neck Flange Material:

Carbon steel: ASTM A105/SA105N; ASTM A350 LF1; LF2; CL1/CL2, CT20;16MN;RST37.2;S235JR;P245GH;P250GH;P250GHM; C22.8;Q235;15CrMo

Stainless steel: ASTM A182, SS303; SS304/304L; SS316/316L; F321; F347; 316Ti; A182F317/317L; SS400;SF440

Alloy Steel:ASTM A182 A182 F12,F11,F22,F5,F9,F91,F51,F53,F55,F60,F44,F304H,F316H,F317H,F321H,F347H,INCONEL 600,625,825,etc.

3. Weld Neck Flange Wall Thickness: Sch5, Sch10, Sch20 , Sch30, STD, Sch40, XS,Sch80, Sch100, Sch120, Sch140, XXS, Sch160;

4. Weld Neck Flange Pressure Rating:

ANSI B16.5: Class 150 Flanges-Class 2500 Flanges;

DIN: 6Bar 10Bar 16Bar 25Bar 40Bar 63Bar

JIS: 5K Flanges-30K Flanges

EN1092-1: 6Bar 10Bar 16Bar 25Bar 40Bar 63Bar 100Bar

5. Weld Neck Flange Surface treatment: Anti-rust oil, black / yellow / transparent / electric galvanized / hot galvanized.

6. Weld Neck Flange Standard:

  •  ANSI B16.5, A105 150LB / 300LB / 600LB / 900LB / 1500LB / 2500LB
  •  DIN 2573 PN6 / DIN 2576 PN10 / DIN2502 PN16 / DIN2503 P25-40 / DIN2566 PN16 / DIN2631-2635 RST37.2 OR C22.8
  • JIS SS400 OR SF440 5K / 10K / 16K / 20K / 30K
  • UNI 2276 / 2277 / 2278 / 6084 / 6089 / 6090 / 2544 / 2282 / 6091-6093
  • EN1092 PN6 / PN10 / PN16 / PN25 / PN40 / TYPE1 TYPE2 TYPE 5 TYPE 12 TYPE 13
  • BS4504 SANI1123 1000/3, 1600/3, 2500/3, T/D, T/E, T/F carbon steel flange
  • AS2129 TABLE D / TABLE H / TABLE E carbon steel flange
  • GOST 12820-80 / 12821-80 carbon steel flange

7. Weld Neck Flange Tolerance: according to the standard.

8. Weld Neck Flange Package: Plywood pallet or case.

9. Weld Neck Flange Delivery time: At the earliest ,within the period required by customer.

Class : 15030060090015002500

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