GOST Weld Neck Flange

specification:

FLANGE WELD NECK

PN6,PN10,PN16,PN25,PN40,PN63,PN100,PN200

DN15-DN1600

FLANGE GOST-12821-80

Type:Welding neck(WN)

Material:CT20,16Mn,stainless steel 304/316/316L,Q235

Processing technic:Forging

Surface treatment:Rust-preventative oil

Butt welding flange is two large diameter pipe connection device, usually two flange and number of the bolt, its plastic strength is low, after adding suitable amount of carbon becomes hard, plastic lower strength enhanced.Connection it may need to bear very high tensile, compression, torsion and shear strength.Butt welding flange conveniently, manufacture simple, low cost, widely used, but with poor rigidity, therefore shall not be used for supply and demand, flammable, explosive and high vacuum degree requirements of the chemical process piping systems and height, extremely dangerous situations.Sealing surface type plane and surface.Butt welding flange welding electrode consumption is much, can not stand high temperature, high pressure, repeated bending and temperature fluctuations.