Everything is conductive. Metals are very conductive compared to non metals. Whats important is how much resistance to electrical flow a conductor produces. Sometimes this resistance is wanted and sometimes it's not. Gold, silver, copper and aluminum are considered good conductors, pretty much in that order although they're so close as not to matter.
Steel has a relatively high resistance.
You might be able to use a spool of steel tie wire, it might have a non conductive coating on it. Any spool of copper wire as long as the diameter and length are the same. A hardware store should have what you need. If your not using a meter then a battery and light bulb should show how the length of wire causes the bulb to get dimmer. Eventually the majority of the conduction is in the magnetic field generated by the flow of electricity and very little in the metal or conductor.