dewar question

D

drysideshooter

Joined
Dec 6, 2011
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244
I am looking for a Dewar. I am wondering if I should consider getting a larger, longer hold time dewar, and a smaller dewar large enough to treat a few blades at a time? My thinking is I could have the larger dewar filled and use it to fill the smaller dewar, and after treating pour any remaining LN back into the larger one. I am thinking a larger dewar with a tighter fitting lid and no holding wires and such protruding through may help the LN last longer? Also, I could get a larger dewar with a smaller neck since I wouln't need to worry about being able to get larger blades in it.

Any thoughts or advice would be most appreciated.

Also, what is current thinking on something like a 200deg snap temper prior to cryo for steels like cpm154 and aeb-l?

I assume most blades should be at room temperature or at least 125 or less prior to cryo, or does it matter?
 
Two Dewar flasks is always a good system.
The blades should be cooled to room temp at least. When I did my own cryo, I cooled in water, cleaned and dried off, and placed in the LN. I haven't seen a need for a snap temper in the steels and thicknesses we use for knives.


BTW, the Dewar lid does not fit tight.........unless you like the sound of "BANG".
 
Stacy, I was actually planning to send you a PM to thank you. I have read so many of your stickies and learned so much from those and your posts. I am genuinely grateful for the time you have taken to help educate others.

I did realize that the lid couldn't be tight due to pressure. That being said, there seems to be quite a few dewar's available that come without lids. I assume I could make a suitable lid out of something like blue DOW foam or something similar?

Does the entire blank need to be submerged in the LN, or just the blade portion? I only ask because I am seeing some dewar's that may not be deep/tall enough for something like a longer kitchen knife and was wondering if at least the blade was submerged and I had a slit in the lid for the handle to stick through if that would be okay, or would be not good?

Thanks again for all of the help Stacy.
 
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