Since the modern metal of choice is steel, ironworkers are sometimes referred to as steelworkers, but both terms mean the same thing. However, there are two different types of ironworkers or steelworkers: *Structural iron and steel workers place, erect, and join steel girders, columns, and other pieces to form structural frameworks. *Reinforcing iron and rebar workers secure and position steel bars or mesh in concrete forms for purposes of reinforcement.