A welding neck flange (“WN”)features a long tapered hub that can be welded with a pipe.
焊接颈法兰（“WN”）具有一个可与管道焊接的长锥形轮毂。

This flange type is used, normally, in high-pressure and high/low temperatures applications that require an unrestricted flow of the fluid conveyed by the piping system (the bore of the flange matches with the bore of the pipe).
这种凸棱类型通常用于需要管道系统输送的流体不受限制流动的高压和高/低温应用中（凸棱的孔径与导管的孔径匹配）。

The absence of pressure drops prevents negative effects as turbulence and erosion/corrosion of the metals in the proximity of the flanged joints.
无压强可防止法兰接头附近金属的湍流和侵蚀/腐蚀等负面影响。

The tapered hub allows a smooth distribution of the mechanical stress between the pipe and the weld neck flange and facilitates the execution of radiographic inspections to detect possible leakages and welding defects.
锥形角皮凸允许在导管和焊颈凸棱之间平滑分布机械应力，并有助于执行射线照相检查，以检测可能的泄漏和焊接缺陷。

The dimension of the flange (NPS and the pipe schedule) shall match the dimension of the connecting pipe.
凸棱的量纲（北极星序和导管一览表）应与连接导管的量纲匹配。

Weld Neck Flange Specification:

Size/尺寸	1/2" (15 NB) to 48" (1200NB)
Class/压力等级	150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
Flange Face Type/密封面形式	American Series: Flat Face(FF), Raised Face(RF), Tongue(T), Groove(G), Female(F), Male(M), Ring Joints Face(RJ) European Series: Type A(Flat Face), Type B(Raised Face), Type C(Tongue), Type D(Groove), Type E(Spigot), Type F(Recess), Type G(O-Ring Spigot), Type H (O-Ring Groove)
Surface Treatment/表面处理	Antirust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized 防锈漆，油黑漆，黄色透明，镀锌，冷热浸镀锌
Materal/材质	Stainless Steel, Alloy Steel, Duplex, Nickel Alloys, Low temperature Steel, Carbon Steel, Cupro Nickel 不锈钢，合金钢，双相，镍合金，低温钢，碳素钢，铜镍合金
Manufacturing process/制造工艺	Cutting, Heat treatment, Die Forging/Free Forging, CNC Machining 锯切、热处理、模锻/自由锻、CNC机加工
Manufacturing Standards/制造标准	ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673 BS4504 , BS4504, BS1560, BS10 HG/T20592-2015、HG/T20615-2015、GB/T9115.1-2000—GB/T9115.4-200、GB/T9115.1-2000、GB/T9115.4-2000

Weld Neck Flange Material Grades:

Stainless Steel/不锈钢	ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Duplex & Super Duplex Steel/双相钢	ASTM A 182 – F51, F53, F55, S31803, S32205, S32550, S31254, SMO254, S32750, S32760, S32950.
Carbon Steel/碳钢	ASTM/ ASME A 105, ASTM/ ASME A 350 LF 2, 20#, Q235, 16Mn
Alloy Steel/合金钢	ASTM / ASME A 182, ASTM / ASME F5, F9, F11,F22, F 91
Copper Alloy Steel/铜合金	Copper Alloy Steel Forged Threaded 90 Deg Elbow : ASTM / ASME SB 111 UNS NO. C 10100 , C 10200 , C 10300 , C 10800 , C 12000, C 12200, C 70600 C 71500, ASTM / ASME SB 466 UNS NO. C 70600 ( CU -NI- 90/10) , C 71500 ( CU -NI- 70/30)
Nickel Alloy/镍合金	ASTM / ASME SB 336, ASTM / ASME SB 564 / 160 / 163 / 472, UNS 2200 (NICKEL 200) , UNS 2201 (NICKEL 201 ) , UNS 4400 (MONEL 400 ) , UNS 8020 ( ALLOY 20 / 20 CB 3 ) , UNS 8825 INCONEL (825) , UNS 6600 (INCONEL 600 ) , UNS 6601 (INCONEL 601) , UNS 6625 (INCONEL 625) , UNS 10276 (HASTELLOY C 276)