Re: EMT conduit handlebars?
I would think twice about using less than 4130 steel or bike shop bars. If your bar brakes your up a creek fast without a boat. If they look like there too easy to bend they probably are. there is a lot of force applied to the bars every time you start a happy time or when you hit a bump.
I have a pair of bars on my motor bicycle that I had now for over twenty years. They have gone on at least six bikes I have put together(motored and pedaled) and if I am lucky they will last another twenty years. Be conservative in your materials and you wont be disappointed.