But then you have Brian's reasoning on this...
"brianbrazealblacksmith20 Jun 2012
I don't harden hot cuts, and I don't know why others do. I used to because I assummed it was necessary, but that was a totally incorrect assumption. I can cut 2" and under 4140 in one heat with a hand hammer with a hot cut made out of the same material and so can anyone else if they have the right tools. I will harden and temper hand chisels, fullers, and punches that I use to lay out cold material like you would with a center punch, but there is no reason or need for haredening and tempering punches and chisels that you do hot work with, and you would only lose the temper when doing large work. If you are going to cut cold then you need to heat treat. I would like to hear some reasons why others would harden such a tool and not just the same old excuse that I had of doing what I thought I had to do or what I was told to do."
Maybe another good debate...?