I thought it was because they used an iron bowl as a trophy, but apparently it is a reference to Birmingham's steel industry.
Stashed in: Football, Football, Favorites, Alabama
Then... Shouldn't it be the STEEL BOWL?
Best Iron Bowl ever:
Fan Rushes on Field and Takes Ball from Brett Favre in Bengals Packers Game
Leigh Steinberg, former super agent and inspiration for 'Jerry Maguire,' seeks Hollywood-like comeback from alcoholism
Budweiser Clydesdale Superbowl Ad 2013