You will struggle to bend 3mm stainless to such a small diameter cold. You will most likely have to heat it up. If you can, make a small peg frame and try to bend I round that first. 100 x100 x10mm plate with a central pin threaded into it. Another pin, say 10 mm away to hold one end of the bar. Heat the bar then try pulling,wrapping the bar around the pin. You are going to have a tough time of it though.
Brian