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Heat vs blade temper

Joined
Jul 16, 2005
Messages
1,772
Hi,
I would like to ask: I have knife from 5160, and I was trying to adjust plastic sheath insert to knife itself. I tried boiling water (knife in the insert).
Then I tried heating the plastic above gas-cooker. (knife was in plastic insert), to the point when plastic started to be soft. When I touched the plastic it felt almost exactly same as hot wax. (I repeated it to this temperature few times). The blade (.25" thick) was hot to touch (couldn't keep finger on it, but not hot enough to burn skin).

Thing is: I heard temperature required to affect temper is about 200 to 300 degrees of celsius. What I am concerned about is edge - is it possible that the blade near edge would heat enough (as it is quite thin) to affect the temper? (I didn't touch the flame I held it atleast 5cm above the flame in the air)
(I used smallest hotplate on lowest output but still...)

(it cuts as before, but I haven't tried it on any harder (e.g. wood) materials yet)

What do you think?
 
If the edge did not change color (purple, blue) then you are OK. At around 400F is when the steel will start showing color.
 
There was no color change.
Thanks for reply
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