Most basic blade hardening steps

[me2]

Yep that's pretty much it. Heat really hot, 1400 to 2200 F depending on steel. Cool fast enough to harden, in brine, water, oil, or air. Then reheat to temper, from 325 to 1200 F, depending on steel an use. Quenching after tempering is good, but not typically necessary for knives.