definitely agricultural I would say, but I couldn't tell you what it is! I doubt its anything other than mild steel, but if it is then it could be a medium carbon spring steel. A spark test is the quickest way to tell, but it can be a bit subjective especially if you aren't used to reading them.
Cut a slither (5mm thick) off the end, get it red hot and plunge it into oil. Place it in a vice and smack it with a hammer. If it snaps then it is good enough to take an edge, if it bounces then you've got a low end medium carbon steel which will most likely be ok for axes, if it bends then its just mild. I say to try this because if you harden in oil and then temper, you don't know how hard it got if any; if you harden in water and it preferred oil it could shatter; if it bounces with oil quench then try water and see if it then snaps; if you harden and then try the file then the surface may be behaving differently to the inside (en45 for example is a great spring steel but the outer 0.5-1mm often doesnt harden).
If it is mild then i'm sure you'll find a use for it. If it is spring steel then it would take a bit of work to change the size to something useful for axes by hand, but doable. If all else fails you could still make an axe by folding it around and firewelding a higher carbon edge into it