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My metal chop saw uses 14" blades, plus the RPM on the wood saw may not match up with the metal blade. I would get a cheap harbor freight metal chop saw before trying it.
I have used metal cutting blades in my chop saw for years. The only issue that you may have is in the blade guard/sawdust collector. The first one I used had a plastic tube that melted when the hot metal chips came in contact with it. I did break down and buy a Makita circular saw that is built specifically for metal...nothing melting and the rate of rotation is correct for metal.
Go get a cheap HF chop saw. I tried that with my skill saw and it didn't work very well. It may be ok on thinner tubing but anything thick it will be difficult, or at least that was my experience. It only costs some time and a cutting wheel so try it out but my HF heavy duty chop saw has worked well for a few years now and it cost me less than a $100 with a coupon. Definitely well worth the cost.
Just use an abrasive cutting wheel, not a metal tooth one, and you will be fine. If you are going to do a lot of metal cutting do as suggested and buy a cheap HF one (or some other chinese brand).
IMO anytime you use a tool for any other purposes than what the tool was intended for there is a risk involved whether it be injury or premature wear down of the tool. My rule of thumb is once twice OK but anymore I buy the correct tool for the job