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I have had some success over the years using discarded power hacksaw blades, (or broken ones which is more the case), for making knives. Some of the smaller older Pop and Son machine shops still use power hacksaws. The are already hard and in the case of worn out ones rather than broken ones, work hardened as well. They don't loose shape after tempering as some bi metals may either. The BUT is they require a lot of filing with a good file when shaping and the handle end usually needs annealing prior to drilling.
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