If you have hit the pipe with a sledge hammer and it didn't break it is probably ductile iron pipe. You can cut it with a sawzall but it will take a while and more than on blade. Ductile iron is lined with concrete on the inside of the pipe so a chop saw with an abbrasive blade is the beat way to cut it. You might want to take a piec to your scrap yard and see if they will take it before you go to a lot of work.
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