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Yes, O1 and 52100 HT about the same. I can't really think of anything that differs between the 2 heat treatments. Normalizing temp is about the same, too. Even the quench oil. Both use medium speed oils. Temper temps are about the same, but as always, verify yourself.
Dan, I know exactly where you're coming from. My kiln is a modified glass kiln, I have a slot cut in the side to insert/retrieve knives. My temp goes down maybe 20 degrees for about 20 seconds after inserting a blade. The higher the aus temp (A2 for example), and the larger the mass of the blade, the more the temp drops and longer it takes to rebound.
I found that a blade, in my kiln, will be AT target temp in just a few minutes. I DO INDEED ADD a couple minutes to my soak time. If I want a 10 minute soak, I set the timer for 12 minutes immediately after inserting the blade. Like Jim said, and Kevin pointed out above, grain growth is a non issue IF you have good temp control.
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