I've started making slot punches and chisels from H-13. amazing stuff. It's important to remember that air hard tooling is most likely as hard if not harder than your favorite hammer. You can put all kinds of dings in the hammer face you spent an hour dressing and polishing . Have a 'consumable' hammer that you don't care about to use on air hard punches and drifts. The consumable hammer should be tempered way soft or annealed to keep from chipping.
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