If you use lighter sheet steel it might roll with your hand, because the curves, all look quite gradual? You could always bond two layers together, if you were looking for thickness in the finished piece.
What does an auger look like before fabrication, I'm not sure?
Think an auger can be made using discs of sheet steel (large washer shape) cut in 1 place and stretched long ways over a pipe,
Probably not that clear but you might get what I mean