The will definitely work on steel. What they won't detect is everything else I seem to hit. rocks, glass, ceramics, and even a lump of concrete I found in eh middle of a of a branch union.
I started out in 2007 with a little home made alaskan (max 24" Bar) and when I made my bigger all Ally mill that could take a 42" bar I thought I'd never use the small alaskan again but I have still used it quite a bit for smaller logs. It's a bit more portable and I can use it in my inner city (we're 1 mile from the CBD) pocket handkerchief back garden. I do this during working hours when everyone else is at work. Short logs have very short cut times so its not like it goes on-and-on-and-on. So far no complaints from anyone. I was expecting a complaint from an ornery artist type who lives a few houses away as we have had run ins with him before over dod barking issues but nit a peep.
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