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Iron is not in itself ductile. It's ductile when it is in alloy to make steel. Cast iron is usually pretty brittle. I think we are talking about, in the context, possibly, "forgings" which being made of steel would be suitably ductile.
Although maybe these days you can get ductile cast iron. So "ductile castings" would seem to be right.
Adam Thomson Local time: 04:41 Native speaker of: English PRO pts in pair: 133