For CPM154, you'll need some sort of protection for your steel because of high temps and long soaks. I use stainless heat treating foil and crimp air-tight packets. I bring the oven up to 1400 for a while to heat soak the oven, then put the packet/blade in to equalize to that temp. Then I ramp to 1925 for a 30 minute hold. I plate quench between 1" aluminum plates. As quenched I usually get around 61RC. You can get another point or so by following quench with a cryo treatment in LN. I temper a minimum of 400F for 2 rounds of 2 hours which yields around 59RC.