What is Ductile Iron Pipe? Ductile iron pipe is a type of Ductile Cast Iron Pipe that is widely used for the transmission and distribution of potable water pipes. Similarly, the ductile iron used to make the water pipe is distinguished by the particles or nodular nature of the graphite contained within the iron. Also, If the house where you are living was built between the 50s-90s and still has its original sewer system, a part of that system is probably iron pipe. Also, older pipes installed were usually made of metals like lead, copper, and cast iron that experience varying degrees of corrosion. However, unless your home is at least 60 or 70 years old, it’s likely your cast-iron sewer pipe is in functional condition. Besides, eventually, cast iron pipes exposed to wastewater will become rusty and weak. Moreover, the rust can sometimes build up inside the pipe, blocking water from passing and causing many problems for homes. Similarly, there are various methods to repair severely rusted cast iron pipes and make them work like new again.