Ductile iron pipe is the successor to the tried-and-true gray cast-iron pipe. It has been in use since the year 1455 in Germany and came to the United States in 1817. Over 600 utilities in the United States and Canada have used cast-iron mains for over 100 years.
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In the mid-1950s, ductile iron pipe was introduced to a more reliable means of moving fluids and chemicals. After more than four decades in use, it is now an industry standard for water and wastewater systems.
The chemical properties of ductile iron pipe are similar to those of cast iron. It is just as resistant to corrosion and equally machinable, but it’s even stronger and tougher. Advancements in casting, metallurgy and quality control produce a higher-quality pipe than ever before.
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The manufacturing process that produces ductile iron pipe changes the graphite in the iron from the flake form in cast iron to a nodular or spheroidal form. This is done by adding magnesium and other elements to the molten iron during the manufacturing. The spheroidal graphite nearly doubles the strength of the iron, which bears out in bursting, bending, beam and tensile-strength tests.
In 1921, U.S. Pipe introduced a new way to make pipe called centrifugal casting. They bought the rights from a French engineer in Brazil, Dimitri Sensaud deLavaud, and brought pipe making into the world of mass production.
Throughout the years U.S. Pipe grew through acquisitions and in the late 1960’s, they were acquired by Jim Walter Corporation and became part of a typical 1970’s conglomerate. The 1980’s gave way to “junk” bond takeover groups and U.S. Pipe was taken private by one of the biggest, Kohlberg Kravis Roberts (KKR). After the buyout, Jim Walter Corporation began selling off assets, but they retained the pipe division. In 1991, Jim Walter Corporation changed its name to Walter Industries and in 1997 the company became public again.
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