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Saw blades are a good source of metal for knife making. Without seeing the blade it is hard to say how much the carbide will help. Carbide tips usually are wider than the blade itself so hand sawing with it might be a little tough due to drag. If you plan on batoning with the blade, the strikes from the mallet or stick will break the carbide off eventually. You might be better off just grinding serrations on a portion of the underside of the blade. That way if you are sawing something of descent size you can rest your off hand on the back of the blade for extra support. You can’t do that if the blade is facing up.