
Staged preheat before austenitizing?
I'm about to heat treat some Zapp Z-Max and the data sheet from zapp strongly recommends 3 equalization temps before reaching austenitizing temp. I normally just preheat my oven (leave at austenitize temp for an hour before putting knives in) rather than preheating my knives because my oven is 120v so it's pretty slow. Even at max ramp rate if I were to do this 3 stage equalization heat treat, my knives would be in the oven for several hours. The austenitize time for Z max is only 10-25 mins. Wouldn't this several hour process cause crazy grain growth?