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well, part of the problem is warpage, but the steel expands and contracts in all directions so even a mold/jig wouldn't be able to stop the wild lengthwise fluctuations along the edge of the blade. ...

This situation isn't really feasible, heat treating a blade that is fresh from a mould can go one of two ways:

1. the fresh from the mold blade is close to the final thickness at the edge to...