i have recently started to get into the knife hobby. like said before my comment, before you go spend time and money on learning to heat treat, try finding old saw blades. Key points to looking for saw blades is to make sure the blade is one solid piece, not a piece of steel with hardened blade tips. i recently used a few of these on a few knifes. works amazing!! the steel is so hard i had to buy carbide bits and they hold a great edge. any old farm tools are going to be hard steel. also flea markets often have the old long 2 person saws, those are hard steel as weel and can make a dozen r so blades. the only downfall to this is the thickness of the blade wont be very great, but excellent results with a good handle and a good grind. saw blades are much harder then lawnmower blades. plus this can help u see if knife making is something you really want to get into