Water-cooled metal mold centrifugal casting tube is also called the ward centrifugal method and its structure characteristic is to use an ever-flowing trough, pouring can be pouring trough mobile, mobile, also can be cast with special water-cooling device structure is complex, high cost.In addition, because the water chilling effect, often appears white cast pipe, need heat treatment, casting pipe production efficiency is high, generally used for mass production of small and medium-sized ball iron pipe diameter.The resin sand lined centrifugal cast pipeResin sand lined centrifugal process is characterized by hang a layer from the surface of metal type resin as binder sand line, metal mold, life can be enhanced greatly and can be obtained without white as-cast centrifugal tube, especially suitable for large diameter ball iron pipe production.