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I know in commecial building work cast and ductile iron is a commonly used material, I believe they use the chain device to cut cast and I used to cut the ductile iron watermain with a demo saw that had a metal blade, like was mentioned though, the old material might be unpredictable when trying to make a clean cut, safest bet would be to score it with a reciprocal saw, it is not too hard of a material. A grinder with a cutting wheel, which is thin, may work better, but a grinding wheel will make a lot more sparks and is much thicker, chiseling is risky, but at some point you still have to get it done somehow, maybe there is another means not yeat mentioned.
If you use a grinder or anything that creates heat and sparks, be sure to wet/soak the surrounding area thoroughly, try to contain the sparks if at all possible, do it early in the morning, that way you have all day to monitor the area in case something did start to smolder. Used to work at a lumber yard years ago, hardware store was an old brownstone type building and they were doing something similar on a friday late afternoon, later that night the place went up and it erupted into an inferno with flames 100' high. Old wood is very dry and it don't take much to make it smolder. I think in this case the contractor was very careless, to the point it may have been intentional, the owner was filthy rich, something did not add up, but I never forgot what I saw and the fire later, flames over 100 feet high, engulfed all the adjoinining buildings, including the pine shed stocked full of finished pine, what a waste, no one including firefighters were injured at least.
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