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ASTM A182 F304 WN Flanges ASME B16.5 Forged Flanges

WN flanges is the most popular type of flanges.ASTM A182 F304 is a American standard grade of stainless steel.The other popular grade is A182 F316.ASME B16.5 forged flanges inculding WN flange,SO flange,SW flange,THD flange,LAPJ flange,BL flange.All types of flanges have pressures:150#,300#,600#,900#,1500#,2500#.

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ASTM A182 F304 WN flanges are very popular all over the word,beacuse weld neck flange is the normalest type of flanges.ASME B16.5 forged flanges are flanges manufactured according to American Standard which is used in many countries worldwide.ASTM A182 F304 is as popular as A182 F316,because this grade also has excellent functions.


A weld neck flange (also named as a high-hub flange or tapered hub flange) is a type of flange. Weld Neck Flange is easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.


A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has numerous holes drilled into it that enables the flanged to be attached to a bolted flange. This design is far better because of the structural valve.



Standard: used with butt weld fittings

Long: used on vessels, columns or barrels, matching vessel nozzles and equipment.



Flat Face Full Face (FF), Raised Face (RF), Male Face(M), Female Face (FM), Tongue Face(T), Groove Face (G), Ring Joint Face ( RTJ/ RJ ).



  1. Unrestricted product flow
  2. Prevents turbulence at the joint and reduces erosion



Shape Weld Neck Flange ( WN)
Size Range 1/2″ – 48″/ DN15 – DN1200
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Standard ASME B16.5, ASME B16.47 Series A/B, EN 1092-1, API 605, MSS SP-44, DIN 2627, DIN 2527, DIN 2558, DIN 2576, DIN 2641, DIN 2655, DIN 2656, DIN2573
Carbon Steel ASTM A105 / A105N, ASTM A350 LF2/LF3, ASTM A694 F42 / 46 / 56 / 60 / 65, P235GH, P265GH, P280GH, P355GH
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 321, 310S, 317,347,904L, 1.4404, 1.4437.
Duplex Stainless Steel ASTM A182 F51, F53, F44




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