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  • Long Welding Neck Flange
  • Long Welding Neck Flange
  • Long Welding Neck Flange
  • LWN Flange

Long Welding Neck LWN Flange

  • Type: LWN Flange
  • Class: 150#-2500#, 150LBS-2500LBS
  • Size: 1/2" (15 NB) to 24" (600NB)
  • Service: Welding, Fabricated, Customized

Long Weld Neck Flange LWNF

A Long Weld Neck Flange is an integral self-reinforcing Flange connection primarily for ASME Pressure Vessel applications. The neck height of the long weld neck flange is higher, which improves the rigidity and bearing capacity of the flange. Compared with butt-welded flanges, the welding workload is larger, the welding rod consumption is higher, and it cannot withstand high temperature and pressure, repeated bending and temperature fluctuations, but it is more convenient for on-site installation and can omit the process of welding seam scratching, which is more popular.long weld neck flange
We HT PIPE is the manufacture that provide all kinds of  steel flanges like Long Weld Neck Flanges, Plate flat Flanges, Weld Neck Flanges, Slip On Flanges, Socket Weld Flanges, and so on, and also other special flanges according to the client's requirement.
Long Weld Neck Flange LWN Specification:

Standard Type Class Size
ASME B16.5 WN/LWN/SO/Blind/Lap Joint 150#-2500# 1/2"-24"(Except Blind Flange 2500lb 1/2"-12")
Sealing Surface RF FF RTJ TF GF LF LM
Flange Face Finish Stock Finish/Spiral Serrated/Concentric Serrated/Smooth Finish(Ra 3.2 and 6.3 micrometers)
125-250 AARH(it is called smooth finish)
250-500 AARH(it is called stock finish)
Coating Vanish, yellow paint, anti-rust oil, galvanizing etc

LWN Flange Material Grades:

Carbon Steel ASTM /ASME A/SA105(N), A350 LF2/LF3, A694 F52, F56, F60, F65, F70
Alloy Steel ASTM/ASME A/SA 182  F5, F9, F11, F22, F91
Stainless Steel ASTM/ASME A/SA 182 F304, 304L, 304H, 310H, 316, 316H, 316L,
316Ti, 317, 317L, 321, 321H, 347, 347H, 904L
Duplex and
Super Duplex
ASTM/ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61,
S31803, S32205, S32550, S31254, SMO254, S32750, S32760, S32950
Nickel Alloy Steel ASTM/ASME B/SB 564 UNS N02200(NICKEL 200), UNS N04400, (MONEL 400),
UNS N08825( INCOLOY 825), UNS N06600(INCONEL 600), UNS N06601(INCONEL 601),
UNS N06625(INCONEL 625), UNS N10276(HASTELLOY C276)
ASTM/ASME B/SB160 UNS N02201(NICKEL 201),  ASTM B/SB472 UNS N08020(Alloy 20)
Copper Alloy ASTM/ASME B/SB151 UNS N07060, 71500, C70600(CuNi 90/10), C71500(CuNi 70/30)
Titanium ASTM/ASME B/SB381 Grade 2, Grade 5, Grade 7
Manufacturer, exporter & supplier of ASME/ANSI B16.5 Carbon steel Long Weld Neck Flanges, Alloy steel Long Weld Neck Flanges, Nickel alloy steel Long Weld Neck Flanges,  Stainless steel Long Weld Neck Flanges, Duplex steel Long Weld Neck Flanges, ASTM A105/105N, ASTM A350 Lf2, ASTM A694, ASTM A182, ASTM B564 Long Weld Neck Flanges manufaturer in Zhengzhou HT PIPE.

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