I want to know sth. about Cast Iron Pipes

Cast iron pipe can be replaced by plastic pipe, but that plastic is a bit different from plastic in our daily life, it may be some high density PU or something like that which will not rupture easily and thus only need to replace only after a very long time (very much longer than that of cast iron pipe) and the total cost will be much lower.

Cast iron pipe is made of cast iron. Cast iron's another name is pig iron, which is harder and resist to corrosion

Cast Iron has, for hundreds of years, been the preferred piping material throughout the world for drain, waste, and vent plumbing applications and water distribution. Gray iron can be cast in the form of pipe at low cost and has excellent strength properties. Unique corrosion resistance characteristics make cast iron soil pipe ideally suited for plumbing applications.

Cast iron and steel corrode; however, because of the free graphite content of cast iron (3% - 4% by weight or about 10% by volume), an insoluble graphitic layer of corrosion products is left behind in the process of corrosion. These corrosion products are very dense, adherent, have considerable strength, and form a barrier against further corrosion. Because of the absence of free graphite in steel, the corrosion products have little or no strength or adherence and flake off as they are formed, thus presenting fresh surfaces for further corrosion. In tests of severely corroded cast iron pipe, the graphitic corrosion products have withstood pressures of several hundred pounds per square inch although corrosion had actually penetrated the pipe wall.

First, cast iron is relatively resistant to corrosion because of its microstructure component compounds-graphite and phosphide eutectic. These compounds are not present in steel, which explains why the two materials corrode in different manners. Second, cast iron can be cast into virtually any shape that is required for structural or decorative purposes. To form complex shapes and structural systems, these castings were designed with flanges that made it possible to bolt the component parts together. This prefabricated style of construction facilitated the erection of lighthouses in a timely, economical manner.

Cast iron is an iron-carbon alloy with a high carbon content. It is easily poured while molten into molds, making possible numerous decorative and structural uses. Cast iron is too hard and brittle, however, to be shaped by hammering, rolling, or pressing. Cast iron contains in its microstructure several relatively corrosion resistant components which are mostly absent from the microstructure of steel. Because of this, the two materials corrode in different manners. It is more rigid (highly resistant to buckling) than other forms of iron and can withstand great compressive loads, which helps account for its ubiquitous use for lighthouse tower structure components such as wall plates, columns, sockets, struts, deck plates, etc. Cast iron does have some drawbacks. There is the potential for inherent flaws in cast pieces such as trapped air pockets or foreign material such as casting sand or slag trapped in the iron during the casting process. These flaws can be avoided if the castings are thoroughly inspected and the casting process is performed to accepted industry tolerances.

I hope this can help your understanding. =)

Iron pipe is manufactured by ironworks (An ironworks or iron works is a building or site where iron is smelted and where heavy iron and/or steel products are made. The term is both singular and plural, i.e. the plural of ironworks is ironworks.)

'Cast iron pipe' is the action of picking up a piece of iron tubing and cast it to the floor. Just like cast spell, you can cast it well if you are trained properly.

If you use plastic to replace for iron, that will be 'cast plastic pipe'. There are very many different materials in the world, so 'cast xxx pipe' is also possible.