You need the right blade and need to go very slowly but, yes.
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It can be done with the proper cutting blade/wheel.
Just keep in mind that you aren’t cutting wood so you may need to go slower than you normally would, and I would use a clamp to the hold the work piece.
Might be worthwhile to try some practice cuts as well.
My saw has a built-in clamp, but it's fairly cheap. I'd feel better using a proper clamp for sure.
Take all the safety precautions (clamp it, safety goggles, hearing protection, double condom, mother on speed dial) until you understand how it behaves and use a metal cutting blade. Also use some cutting oil.
Don’t do what I saw one home improvement professional idiot doing - repeatedly slamming the blade into the workpiece until the blade stalls. It was painful to watch.
Oil's a good call that I hadn't seen mentioned yet.
One thing that is overlooked here by the other posts is that the blade speed on a wood miter saw is too fast for the metal cutting blade. If you look at the fein slugger or evolution rages, they operate at lower rpms. It might work but you need to make sure you don't overspeed the blade.
I believe my saw is locked to 5000 rpm.
I know that chop saws and cold saws usually used for metal run a lot slower, but you can buy metal-cutting blades for regular circular saws. I understand that I would have to move very slowly compared to cutting wood, but I can't slow down the blade itself.
Do you have an angle grinder? If you don't need perfectly clean cuts, that might be a better option (and doesn't take as much space)