Forged Long Welding Neck Flanges (Forged LWN Flanges) are high-performance flanges manufactured through a forging process and designed with an extended tapered neck.
They are primarily used in high-pressure, high-temperature, and critical service applications, especially in pressure vessels, reactors, and heavy industrial systems. The long neck provides reinforcement and ensures smooth stress transition between the flange and the connected equipment.
Compared to plate or fabricated flanges, forged LWN flanges offer superior mechanical properties, structural integrity, and reliability.
Forged Long Welding Neck Flanges
Flanges types:
Long Welding Neck Flanges
Material:
Carbon steel : A105, A36, Rst37.2, St37.2, C22.8, SA350 LF2/LF1, Q235, Q345, SS400,
Stainless steel: 304,304L,316,316L,F321,F347,F310F44F51,A276 S31803, A182, F43, A276 S32750,A705 631,632,A961, A484,
Alloy steel: SF45, S235GRJ2,ASTM A694 F42,F46,F52,F56,F60,F65,F70, A182 F12,F11,F22,F5,F9,F91,F1ECT
Surface treatment:
Antirust oil, yellow, epoxy coating, nylon surface,hot galvanized,electrical galvanized
Making type:
Forged
Standard:
ANSIB16.5/B16.47/B16.48/B16.36, ASME,MSS SP44, AWWA C207,DIN2527, DIN2566, DIN2573,DIN2576,DIN2641,DIN2642, DIN2655, DIN2656, DIN2627, DIN2628,DIN2629, DIN 2631, DIN2632,DIN2633,DIN2634,DIN2635,DIN2636, DIN2637, DIN2638, DIN2673 BS4504/10, JIS, EN 1092, NF, API590 FIG.8, GB, etc.
Pressure grade:
ASTM B16.5: 150LBS, 300LBS,400LBS, 600LBS, 900LBS, 1500LBS, 2500LBS
DIN: 6Bar, 10Bar, 16Bar, 25Bar, 40Bar
JIS: 5K,10K, 16K, 20K, 30K
BS4504: PN2.5-PN40
BS10: Table D, E, F, H
