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Weld neck flange

Weld neck flange (WN flange) has a neck that can relocate the stress of the pipe, so to reduce the pressure that is gathered in the flange bottom. It is compatible with pipelines that work in high or low temperatures and bear high pressure. Especially for the pipe or the valves when PN is larger than 2.5 Mpa.
Product name: weld neck flange, welding neck flange, Long Weld Neck Flanges, weld neck flanges, weld neck reducing flanges, WN flanges, Weldoflange
Standard: ASME B16.5, ASME B16.47, EN1092-1, BS4504, GOST12820, DIN , AWWA C207 etc.
Specification: 1/2 "to 24"
Pressure: 150LB, 300LB, 600LB, 900LB, 1500LB, 2500LB;
Product Details

Weld neck flange material:

Carbon steel flange (CS) : ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70;

Stainless steel flange (SS) : ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;

Alloy flange (AS) : ASTM A182F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, ST45.8;

Application range of weld neck flange:

Weld neck flange has many features: not easy to deform, good sealing, wide application, have corresponding rigid, elastic demand and reasonable butt thinning transition, joint good distance away from the joint face the faying surface from welding deformation temperature, it take more complex syndromes beep form structure, suitable for pressure or temperature fluctuations of pipeline or high temperature, high pressure and low temperature pipes, Generally used for PN greater than 2.5mpa pipe and valve connection; It is also used to connect pipelines conveying expensive, flammable and explosive media. 

Standards, Dimensions & Weight of Welding Neck Flanges:

Standards, Dimensions & Weight of Welding Neck Flanges


weld neck flange feature:

Connection type: single side welding, double - sided nut connection. Product features:Good appearance, smooth surface, acid and alkali resistance, corrosion resistance, strong texture performance. Production process: oxygen furnace opening, overall forging or finished forging cutting molding. Processing mode: high precision CNC lathe turning, CNC rocker drilling.

Product quality control of weld neck flange:

1. The raw materials from well-known manufacturers such as Bao Steel and Baotou Iron and Steel are selected to ensure product performance. The raw materials are inspected once entering the factory, and the samples are produced before mass production.

2. Using the forging process, the round steel after forging will improve the mechanical properties of the metal, improve the internal organization of the metal.Therefore,the bearing capacity is stronger, and stability will be better.

3. CNC lathe processing, accurate size, with enough material.product surface will be bright without scratches.

4. Company name, specifications, furnace number and other information will be marked on each product, and every process of the product can be traced back.

Weld neck flange purchasing:

1: It is recommended to purchase from a regular and with a certain production scale manufacturer.

2: Flange manufacturers need to provide the material inspection report and other related materials;

3: Steel flange under ANSI B16.5 should be of corresponding specifications and models steel stamp and identification;

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