When you put steel wool in HCl, the solution will turn pale green which indicates Fe(II) but if you leave it out (uncovered) for a couple hours, the Fe(II) readily converts to Fe(III) (turns yellow-brown) because of the air.
I don't think you'll get Fe(III) directly from Fe instantly. Interestingly, you can reverse it by adding more steel wool to get back Fe(II).
Also, I believe iron rust in HCl will form Fe3+.