Pika is right about steel stock. So here is the compromise: buy a sawzall blade that you like, carefully heat it until it loses its magnetism (cherry) and let it cool off slowly. (insulated). Then work it into your shape but don't fully sharpen the cutting surface or it will burn and chip. Heat it until it looses its magnetism and quench it in automatic transmission fluid diluted with a little solvent. Be careful because the smoke can flash fire, use long tongs and gloves. Then put the rough blank in the oven @ 350-400 for an hour. You can always experiment with scrap to find a hard AND flexible heat treatment. Forging with a torch isn't too hard either. The tool most used is a belt sander. It's easy and fun, pretty soon you get to reading a lot and buying flat stock on ebay.
Live to tell.