hi you said the pipe is steel etc but if the piece that needs to be cut is plastic you can cut it with a chain saw, with long enough bar etc.... i worked construction for several yrs and we cut all the plastic culverts we put in road crossings to the length we needed with a chain saw it works good and is quick and easy.if that wont do you mite try a gas power chop saw thats designed to cut steel , concrete etc just use the the right saw wheel , the saw looks like a chainsaw with a saw wheel designed to cut steel etc... depending on the type of wheel you install. i hope this is of some help to you