Are you putting a radius on this just because you want to be different? Or is this where you are getting your drop over the steps? Or is it the stairs curve to the left or right?
I've used a tubing roller on lighter stuff, channel, decorative tubing even. I had to get a custom die made but rolled 100 feet of decorative tube for a condo I did rail at and had to have this on the inside of the guardrail for handrail. If you had a tubing roller doing 9-10 feet would be a breeze. Use a common size so the dies are easier to get. Most pipe rail I build is a schedule 40 pipe but I suppose you could use a 1.5" tube which or something. A 12 ton bender would work just have to go slow and easy a little at a time. Make a template of what your radius is like and bend your pipe little by little and keep checking it against the template. Takes time but it works and cheaper than paying a guy with a roll machine, plus you can get it more accurate to what you actually have. Most concrete that I have had to make templates of are no radius at all, just some concrete guy throwing up a piece of ply and standing back then saying, "looks good".
The stuff I did looked great over a distance but it had long steps, each step had a slightly different radius than the other but they were all connected over a 30 foot length. I know this sounds weird but rolling out one continuing radius of 20 feet for example and it would not have worked on these stairs. I had to tweak and work it over the entire length to match the templates. Not hard or hard to figure out, just takes patience.
Hope this is what you were looking for.
Shawn
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