Thank you sir.I would recommend Parks AAA. I have been told that temperature is not critical for this oil.
ThanksIf you can only invest in one quench oil, use steels that it was designed for to get best results. As said above, Parks #50 for 10XX series, W1/W2 and 15n20. AAA for 80CrV2 and 52100.
If you keep making knives, you'll eventually want both oils, and in a decent amount. I'm in the process of getting a larger tank for my AAA, as I can only quench 2-3 blades of 80CrV2 at a time before it gets too warm and I start losing some hardness.
ThanksI would use parks 50 for any 10xx, w1/w2 and 15n20 and pattern welded steel made with any of those.
I would not use parks 50 for 80CrV2 or 52100. For that I'd use a slower/medium speed oil.