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By certification 
Weld-Neck flanges or welding-neck flanges can be differentiated from all other types of flange by their long tapered hub.
The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.
The welding neck flange is the best designed butt-welded flange of those currently available because of its inherent structural value.
JIS Weld Neck Flange Specification:
Size |
1/2" (15 NB) to 48" (1200NB) |
|
Class |
5K,10K,16K,20K,30K,40K |
|
Flange Face Type |
Flat Face(FF), Raised Face(RF) |
|
Surface Treatment |
Antirust Paint, Oil Black Paint, Yellow Transparent, Hot Dip Galvanized |
|
Materal |
Stainless Steel, Alloy Steel,Carbon Steel |
|
Manufacturing process |
Cutting, Heat treatment, Die Forging/Free Forging, CNC Machining |
|
Manufacturing Standards |
JIS B2220 |
|
1. Standards:
JIS B2220
2. Material Specification:
SS400, SF440 , ASTM A182 F304/F304L, F316/F316L,321, 347
A182 F11, F22,F5,F9,F91,F1
3. Pressure Ratings:
5K, 10K, 16K, 20K, 30K,40K
4. Size Range:
1/2" (15 NB) to 48" (1200NB)
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