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Weld Neck Flange:
Weld Neck Flange is flanges that designed to be joined to a piping system by butt welding. This kind of flange include lots of specification, This Flange is expensive because of its long neck and cost of people for contact WN flange with pipeline or fitting but is preferred for high stress applications. The necks, or hubs, transmits stresses to the pipeline.
The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the flange. The bore of Weld-Neck matches bore of the pipeline, reducing turbulen.
Material & Grades of Weld Neck Flanges:
Carbon Steel Weld Neck Flanges :
ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706 Low Temperature Carbon Steel Weld Neck Flanges : ASTM A350, LF2, LF3
Alloy Steel Weld Neck Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91 Copper Alloy Steel Weld Neck Flanges : ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200
Nickel Alloy Weld Neck Flanges :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020)