Not quite sure I understand the question. You want to use angle iron on the ends to drop/slip the stall wall board in? If so yes this can be used for this purpose. But 1 1/2" wide U-channel that is made for this purpose can be had and is cheaper and easier to install than buying two pieces of angle iron.
You don’t have to use either if you don’t want to. You can take an inexpensive 2X4 and rip/saw it down length wise to make a 1-1/2 by 1-1/2 “strips” Nail/screw it to the end walls to make a slip board channel. Simple and does the job. The 22 stalls in our barn were built that way years ago and they have stood the test of time just fine. Yes, the give “purchase” for horse to chew on. But horses will chew on lots of things in stalls. That’s what horses do. Wear and tear should be expected.