球墨铸铁管的公称口径为80～2200毫米，与灰口铸铁管相比，强度大、韧性好、管壁薄、金属用量少、能承受较高的压力，有效长度有5米，6米及8米；按壁厚不同分P、G两级。是铸铁管材的发展方向。球墨铸铁管采用炼铁高炉生产的低磷、低硫的优质铸造铁水，按当前国际上先进的离心铸造、退火工艺，水冷金属型离心铸管机浇铸而成，经过退火、承插口修整、水压试验、内壁衬层水泥、水泥衬层养生、水磨水泥内衬、外壁涂敷沥青漆、沥青漆烘烤、承口防锈处理、喷唛头及包装等多道工序的精心处理，具有高强度、高延伸率、耐腐蚀的钢筋铁骨。
The nominal diameter of ductile iron pipe is 80-2200 mm. Compared with gray cast iron pipe, it has higher strength, better toughness, thinner pipe wall, less metal consumption, and can bear higher pressure. The effective length is 5 meters, 6 meters and 8 meters. According to the wall thickness, it can be divided into P and G grades. It is the development direction of cast iron pipe. Ductile iron pipe is made of low phosphorus and low sulfur high-quality molten iron produced by ironmaking blast furnace. It is cast by water-cooled metal mold centrifugal casting machine according to the current international advanced centrifugal casting and annealing process. It has been annealed, socket and spigot trimming, hydraulic test, inner wall lining cement, water mud lining curing, water mill cement lining, asphalt paint coating on outer wall, asphalt paint baking, and socket rust prevention It has high strength, high elongation and corrosion-resistant steel and iron skeleton through careful processing of processing, marking and packaging