Bending brass angle into a circle.

[Raygers]

I have some 1/2" x 1/2" x 1/8" brass angle I need to bend into a 6" circle, it will be silver soldered at the join. I have tried bending it around a form without much success It twists and the worst part is that the 90 degree angle decreases by several degrees, this is not good for what I need.
Does anyone have tips or ideas for me? Even if I could anneal it, I don't have a suitable amount of heat to do that, I think that the 90 degree angle will change.
I don't have the resources to build a roller which may or may not work.

Any ideas would be very appreciated.
Ray

 

[Jasonb]

Faced with needing similar shapes in the past I have resorted to fabrication, cut an oversize disc, roll or bend flat stock into a circle. Lay circle onto disc and silver solder the two together. Then tidy up the disc to size

At that diameter with 1/2" leg even rolling will be difficult as there is a lot of metal that needs shrinking and extruded angle usually comes in one of the harder brasses that don't bend well