Cangzhou flange | Hebei Cathay | Cathay Pacific plane flange provided by Hebei. Flange Hubei, Hebei and Cathay Pacific, Cathay best quality flanges Pipeline Equipment Co., Hebei (www.hbgtgd.com) 2013 upgrade been newly launched welding and butt welding flange means and pipe connection of flat welding Just one-sided welding is not required when welding flanges welded pipes and flanged mouth, butt welding flange installation requires a double-sided welding flanges. So welded flange generally used for low and medium pressure pipe, welded flange for connection to the high-pressure pipe, welded flange is generally at least PN2.5MPa, using the butt is to reduce stress concentration, the general mostly welded flange with neck flange also called nipple flange. So welded flange mounting costs, labor costs and auxiliary fees are high flange, because more than one process. Forged Flanges and flange cast flange cast out, the rough shape and size accurately, processing a small amount of flat flange, low cost, but there are casting defects (pores cracks inclusions.); Casting streamlined internal organization of the poor (if it is cut pieces, streamlined worse); forged flanges generally lower than the carbon rust cast flanges, forgings sleek good, relatively dense tissue mechanical properties superior to casting flange; forging process large grains also appear improper or uneven welded flange, material hardening crack phenomenon guaranteed flanges, forged costs than casting flange. Forging than casting can withstand higher shear and tensile forces. The advantage is that you can come up with the casting complex shape, relatively low cost; forgings advantage that even within the organization, there is no casting porosity, inclusions and other harmful defects;