I don't mind sharing what I know about it. I encountered ductile iron on a demolition project for a city water treatment plant. I was removing a 2 million gallon water tank that had 24 inch pipes feeding it. The pipes were cast iron which I thought would be easy to break. You could barely scratch one with a backhoe. I tried to torch them, but it would get it up to glowing red hot and never cut it. I ended up grabbing the end with an excavator and pulling up until it broke off a 20 foot section. When I got to the place where I needed to cap it, I had to cut it off with a demo saw with a diamond blade in it. I don't know how the scrap yard deals with that stuff.
Ductile iron, I found out is a different alloy and twice as strong as regular cast.
It looks like cast, but is very tough.
A lot of it is pipe or pipe related like flanges or valves.
There are probably others who know more about it than I do about it but that's my experience.
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