I've done a lot of work in brass bronze silver gold and platinum. Especially in copper. I've never touched Ferrous metals, I just don't have the strength for them. Ferrous can be air cooled, water cooled or oil cooled, depending on the type. My experience is small metalsmithing for the art trade, and also jewelry (bench certified). What might be fun is to add the artsy bit by reticulating the metal for that nice textured look.