Originally Posted by JBS
Correct but remember that the substrate metal on a part like that can/will displace and you end up with a cracked surface over a dent or groove. I would suggest temper harden the part all the way though.
Not enough carbon in a nail to heat treat properly. I've hardened an awful lot of gun parts with Kasenit in the last 50 years and never cracked one or had any trouble with it. I'll try that first, if I ever need to make that part at all.