ductile iron

Ductile iron is one type of cast iron. It was invented in 1942 by Keith Millismoderncasting.com.A typical chemical analysis of this material is:

Carbon 3.3 to 3.8%

Silicon 2.2 to 2.8%

Manganese 0.1 to 0.5%

Sulfur 0.005 to 0.02%

Phosphorus 0.005 to 0.04%

Magnesium 0.03 to 0.05%Other elements such as copper may be added intentionally to increase tensile and yield strength while simulaneously reducing elongation.The unique characteristic of ductile iron is that the graphite forms into a spherespherical shape. Sometimes this is referred to as a "nodular" shape. Ductile iron may also be called "nodular iron".The metal is often used in water and sewer lines, as it is resistant to corrosion and does not crush or break as easily as PVC. As it is more expensive than PVC and is less mallible, it is often used only under difficult terrain.

The Ductile Iron Society
Society to promote the production and application of ductile iron castings.
http://www.ductile.org/

American Cast Iron Pipe Company
Products include: ductile iron pipe and fittings; fire hydrants, valves and pumps for fire trucks; centrifugally cast steel tubes, static castings and fabricated assemblies; and electric resistance welded steel pipe.
http://www.acipco.com/

Bullmastiffs of Opalguard Australia
Dedicated, successful breeders and exhibitors of Australian and International Champion Bullmastiffs for the show ring and for loving family companions. Established 1989. Please visit our website for photos, pedigrees and more information about our dogs and the Bullmastiff breed in general.
http://www.angelfire.com/nb/opalguard/index.html