Take a close look at your chain wrench, what you probabbly have is a glass tube cutter for gage glasses. See if the chain sections have a little wheel in the center. I have one of the gage glass cutters that is a clone of the one in the picture. Of course you could use it as the chain wrench on really small and light duty piping.
Been there, probably broke it, doing that!
I am not a lawyer, and never played one on TV!
All the usual and standard disclaimers apply. Do not try this at home, use only as directed, No warranties express or implied, for the intended use or the suggested uses, Wear safety glasses, closed course, professionals only