Weld Neck Flange supplier High neck flange is also called butt welding flange, it is different from flat welding flange and pipe welding to flange plate has a long and inclined high neck, the wall thickness of the high neck along the height direction gradually transition to the thickness of the pipe wall, improve the stress discontinuity, thus increasing the strength of the flange. High-neck flanges are mainly used in harsh conditions, such as piping thermal expansion or other loads so that the stress at the flange is large or the stress changes repeatedly, the pressure and temperature of the pipeline or high temperature, high pressure and sub-zero low temperature of the pipeline. High neck flange is not easy to deform, good sealing, widely used. High neck flange according to the type of sealing surface can be divided into: plane high neck flange, protruding high neck flange, concave and convex high neck flange, tenon groove surface flange, ring joint surface high neck flange. Weld Neck Flange Specification: Size1/2" (15 NB) to 48" (1200NB) Surface TreatmentAntirust Paint, Oil Black Paint, Yellow Transparent, Hot Dip Galvanized MateralStainless Steel, Alloy Steel, Carbon Steel Manufacturing processCutting, Heat treatment, Die Forging/Free Forging, CNC Machining Manufacturing StandardsGOST 12821-80 Material Grades: Stainless SteelA 182F 304, 304L, 304H, 316, 316L, 316Ti, 321, 321H, 347, 347H Carbon SteelA 105, A 350 LF 2,A694F52,F60,F65,F70 Alloy SteelA 182 F5, F9, F11,F22, F 91 Weld Neck Flanges in three types of paintings: 鈾?Anti-Rust Oil Painting 鈾?Yellow Golden Painting 鈾?Black PaintingWeld Neck Flange supplier website:http://www.goldenoceanflange.com/weld-neck-flange/