Large amounts of Agricultural Steel is made from 1080 carbon steel - especially stuff like plow shares, harrow disks, cultivator/chisel points. Those old dumprake teeth (3/8 inch round stock)are closer to 1095 carbon steel - more like springs. And the modern hayrake teeth (1/4 inch round stock) are also close to 1095.
So they are all ... in the same neighborhood.
The rest is just a matter of hitting it the right way. As Frank Turley told John Teslow during one of his blacksmithing classes: "You're a blacksmith. Move the metal where you need it!" Um ... yeah ... easier to say than to do sometimes.
Nice simple classic knife.
Mikey - yee ol' grumpy German blacksmith out in the Hinterlands