... rough to the finished product, then spray, strictly control from material to finished goods indenpendently.Flange for pipe work ... neck”, slip-on”, “boss””lap joint”, “ socket weld”, “threaded” and also “blind”.We export to America, Canada, Germany, Spain,nertherland ... , Japan, South Korea and Taiwan,so on.And we won praise and trust from customers. We can also manufacture special application flanges ...