The heavy welding neck flanges

　　The heavy welding neck flanges are also named heavy WN flanges, which are hot formed from a circular section of steel plate having a very small co-axial hole in the flange center. The steel around the hole is shear-formed downward and outward by a tapered die plug which is forced by the small hole forming an integral neck on the weld neck flange. A supporting ring die is radiused at its inner corner to form a suitable fillet radius at the junction of the neck with the flange proper. A suitable pre-forming or post-forming operation may be required to compensate for any deflection in the work piece out of planar configuration.

　　We have adopted advanced production equipment and technologies to manufacture our Blind flange stainless steel, which can not only improve product quality, but also save raw materials. Our products have high strength, good toughness and resistance to corrosion.