This steel weld neck flanges is circumferentially welded into the system at its neck which means that the integrity of the butt welded area can be easily examined by radiography.

The bores of both pipe and flange match, which reduces turbulence and erosion inside the pipeline. The weld neck is therefore favoured in critical applications. The various types of steel weld neck flanges are:

Weld Neck Flat Face Flanges

Raised Face Weld Neck Flanges

ANSI B 16.5 Class 150 ANSI B 16.5 Class 300 ANSI B 16.5 Class 600
ANSI B 16.5 Class 900 ANSI B 16.5 Class 1500 ANSI B 16.5 Class 2500

Stainless Steel ASTM A 182, A 240 Grade F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L, Duplex stainless steel UNS S31803, 2205, Super Duplex stainless steel UNS S32750 Carbon Steel ASTM A 105, ASTM A 181 Alloy Steel ASTM A 182, GR F1, F11, F22, F5, F9, F91 Nickel Alloys Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276 Copper Alloys Copper, Brass & Gunmetal Size 1/8" NB TO 48"NB. Class 150#, 300#,400 #,600#,900#, 1500# & 2500 #. Standard ANSI ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 DIN DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673 B.S BS4504 , BS4504, BS1560, BS10