Thanks Ken! I'll check out the other thread.Randy, here's a thread where I purchased 10 liter dewar and much is discussed there. How long will LN last in the dewar? All depends, I think I've still got enough LN to treat a few more blades and it's been a tad over 8 wks now since filling. Which is most cost effective? "IF" you factor in the $200 (plus taxes) for the dewar and you only do a few blades, dry ice slurry. Also depends on cost of LN in your area. That you'll have to check around, as I said my local cost varied from 50 cents/liter to $6/liter depending where I got it. Usually LN is available at a welding supply house.
Also depends on cost of dry ice in your area. https://knifedogs.com/threads/ln-dewar.51471/
The one I'm looking at in the picture above is about 5 gallons with a 4 inch neck.Randy - The size of the tank makes a difference. When I looked, it ranged from a couple of liters up to hundreds of liters. More important was the size of the opening. Most of the dewars had an opening less that 2 inches. It was hard to locate one with a bigger sized neck opening.
5 gallon? That's what, 20 liters, roughly anyway. 20 liters will hold longer than my 10 liter, but the 4" opening will hurt some on holding time. The 50mm opening will take what's called a 2" wide blade, well, it'll like .040" or so. Only if you plan to do a lot of wider blades would I consider the 4" opening, unless of course you're getting a really good price on it.The one I'm looking at in the picture above is about 5 gallons with a 4 inch neck.
You’re right. After looking at the ad closer it only holds 3 liters. I want one with a capacity of at least 10 liters.So I don't know much about dewars, but that is maybe 1/4 of the capacity of the shell. It's like an old coffee thermos with a pretty big outside shell and not a very big inside.
Send `em to Randy.I have been playing with heat treating AEB-L. I bought -100 degree camper antifreeze $25.67, I bought a 7lb block of Dry Ice from Publix for $12.71, I can get the dry ice any day of the week. I never priced LN here in my area. I figure if I am going to do a batch of AEB-L knives I will send them out to be done.
That’s kinda what I’m thinking too Todd. Do a batch of 10-15 blades ready to grind whenever I need one. The next question is what is the real benefit of cryo on AEB-L? Is it worth the extra effort?I think that a lower volume guy like most of us could get by with a couple fills a year, and do our heat treating in batches and have profiled, hardened blanks ready to grind and finish when it was time to do so.
I started to say yes that cryo treatment is worth the extra effort, but then I started to read Cryogenic Processing of Steel on KnifeSteelNerds.com.That’s kinda what I’m thinking too Todd. Do a batch of 10-15 blades ready to grind whenever I need one. The next question is what is the real benefit of cryo on AEB-L? Is it worth the extra effort?
That's the impression I got. You summed it up better than I did. ThanksLarrin's 3 articles on cryo treatment is well worth reading, and all 3 articles need to be read. My take on reading them was..... you can find a study to support most any claim you make about most anything. Larrin does a good job of gathering many different studies together, and does some tests himself. Also, from reading the articles it seems that different steels react to cryo differently, so a series of tests needs to be done on many different steels.