Cast iron pipe is a pipe which has had historic use as a pressure pipe for transmission of water, gas and sewage, and as a water drainage pipe during the 17th, 18th, 19th and 20th centuries. It comprises predominantly a gray cast iron tube and was frequently used uncoated, although later coatings and linings reduced corrosion and improved hydraulics. In cast iron pipe, the graphite forms flakes during the casting process, when examined under a microscope. Cast iron pipe was superseded by ductile iron pipe, which is a direct development, with most existing manufacturing plants transitioning to the new material during the 1970s and 1980s. Ductile iron pipe is different than cast iron, because the introduction of magnesium during the casting process causes the graphite to form spheres (graphite nodules) rather than flakes. While this allows the material to remain castable, the end product is much tougher than cast iron, and allows elastic behavior at lower stress levels.Little cast iron pipe is currently manufactured, since ductile iron pipe is widely accepted as a superior product. Many public utilities, municipalities, and private industries still have functional cast iron pipe in service to this day

Strength

Cast iron has higher strength at reduced costs. They also have higher strength and ductility and are stiffer than pure iron. The strength of cast iron is what makes it a workable material for various industries. It has a low melting point and greater fluidity.

Castability

Cast iron is used in an array of industries because of the ease of its castability. The cast iron can be molded into various shapes and sizes based on the industrial needs. The cost of production and the minimal usage of tools make it a viable manufacturing material.

Machinability

Cast iron can be easily machined into final products. The properties of a metal like hardness, tensile strength and microstructure alter its machinability. Hence, it can be used in a number of industries for manufacturing numerous products.

Low cost and durability

Cast iron saves tons of money in the long term. It requires little or no maintenance for a long time coming. Using cast iron in industries can eliminate unnecessary replacement. Further, cast iron products can be integrated into existing systems, thereby minimizing the cost of replacement. Cast iron is also more malleable than other metals.