Toolmakers Vise Material

How does A2 compare to O1?
I'd like to harden it but don't know if it is necessary.

If the A2 has been normalized, (the way you bought it) it should be easy to work. I've not had the privilege of using it so I'm not sure. The major difference between the two is the hardening process. O1 hardens when quenched in oil. A2 hardens when removed from the heat source and waved about in the air. (air hardening) Both should be ground after tempering, (raising to about 500º F and letting cool naturally. Grinding is necessary because they swell slightly when hardened.
 
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