That size can probably be bent around a wooden form cut to the desired radius, see the picture:
Black is a circle of wood screwed to a plywood base.
Blue is a block to hold one end of the bar.
Red is the length of bar.
Yellow is a piece of pipe to give leverage. Start with the pipe slid down close to the circle of wood, bend a little then pull it back slightly and bend some more. This keeps the bend tight against the wooden form.