Generally, CP is in the 1400's F, and CT is in the 1500's F. If I'm forge heat treating, I go to CP,
note the color and let the steel sit until the color is a LITTLE more to the orange side.
You can also see the recalescence/decalescence shadows pass across the steel as the carbon
enters/leaves solution. The shop should be pretty dark to see this well, but after you've seen
it once you won't miss it again.
I generally quench in Parks 50 oil for hardening, and temper oven is a gas grill with multiple thermometers.
Temper about an hour, let cool to room temp, 3 times. Most of my heat treating is done on