Ray Rogers Handcrafted Knives
The Nitrogen Dewar
This is a nitrogen dewar for liquid nitrogen. Basically, they are
oversized thermos bottles designed to hold super cold (minus 300 degrees)
liquid nitrogen. Part of the heat treating process is the cryogenic quench.
That's where these guys get used - just put your blades in there, very carefully
and slowly.
You do it carefully because even a room temperature piece of steel causes the
super cold liquid to boil. If you drop the blade in the tank and splash yourself
it's possible to be seriously injured. Also, there's the problem of not getting
that blade back anytime soon.
You do it slowly because lowering the warm steel into the tank too fast can cause the
blade to crack. I'm sure you've seen the classic experiment where a fresh rose is lowered
into super cold liquid and then withdrawn and shattered against a table. Think about it
before you get careless with this stuff.
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Ray Rogers Handcrafted Knives
