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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making. |
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#1
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Filing guide hardness
I made a file guide from O1. One of the two pieces snapped in half the first time I tried to use it. I'm making another one. The first one I left at full hardness with no temper whatsoever. Should I temper my new one? Of course I want it to be as hard as possible. I wonder if a quick tempering at a low temperature might help prevent cracking, but still leave it hard enough. Thoughts?
Thanks, Don |
#2
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Temper at 375? and you should be fine. Even 400? will not allow a file to cut it, if you achieved full hardness. A common file does not cut steel harder than 58/59 Rc.
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#3
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You should be able to "snap temper" the O1. That is, 300F for an hour or two. It will be as-quenched hardness without out the brittleness.
Where's 'mete' when you need him? =] Mike |
#4
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I'm right here Mike ! I'd go 350-400 F. That way you should get full hardness without any brittleness.
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#5
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'mete',
From your point of reference, what are the problems you see with HT-ing a filing jig at snap-temper? Not disagreement... looking to learn something. Mike |
#6
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First a comment to Don and others . Many don't appreciate that O-1 is not a simple steel as it has enough alloying elements to make a proper soak significant .That's the first step in getting full hardness.
I'd like to see a 'snap temper 'used to make cryo a bit safer .Other uses need a higher temper .After all they call it a snap temper not just a temper. In my early training 400 F was a common standard for tempering tool steels . One source gives 62 HRc at 300 F, 61 at 350 F and 59 at 400 F. Another point make sure it's polished - no machining marks ! |
#7
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Thanks guys! I temepred at 375. Seems to be OK so far, except I need to make a bigger one.
Don |
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