Hand Tools

Subject:
These get a trip to the freezer...

David Weaver
..anything that creates a lower terminal temperature (after quench) increases final hardness (and thus range), but does lower toughness just a little. I have a freezer that's about -10F, which does about a third to a half of what liquid nitrogen would do.

I don't think it's critical but it makes sure that everything ends at the same point (if the parks 50 is starting to get warm or if the steel gets a bit too warm before quench) and I can see why old schoolers would finish the job with an ice bath.

There's a metallurgist here in Pittsburgh who posts a whole lot of hard data and trial results (thus the third to half comment from above - ice bath being about the same). Glad to have gotten into hardening and tempering things before reading much about it, though, as there's a lot of static in the info out there that may not apply and a lot of people willing to say "you won't get good results with it".

Curious what the micarta was used for on iowa class battleships - control panels? I'm not much for any specific war history, but a big fan of battleships post 1900 through WWII - the machine and repair shops on the battleships are otherworldly - better than most land based shops until you get to a really big operation.

Messages In This Thread

52100 experimentation continues *PIC*
same chisels. *PIC*
Re: same chisels.
The reason for the choice...
Re: The reason for the choice...
Better than O1
relying on the charts...
caveat on my sharpening perceptions..
Re: caveat on my sharpening perceptions..
Re: caveat on my sharpening perceptions..
Thanks!
for the non-metal folks..
"through hardening"...
Re: same chisels.
Re: same chisels.
Re: 52100 experimentation continues
These get a trip to the freezer...
Re: These get a trip to the freezer...
if it's like the machine areas...
Maybe toughness *isn't* .....
Re: Maybe toughness *isn't* .....
A stake in the ground is needed
Re: A stake in the ground is needed
There's an absolute property..
optimizing hardness and toughness
Discussion and personal value
now I am confused more
Re: now I am confused more
Re: optimizing hardness and toughness
Thank you for the search results
Testing three chisels..
re-do with one of the (52100) chisels
question
Re: question
26c3 mule...
For those like me unfamiliar with 26c3
Re: For those like me unfamiliar with 26c3
Re: 26c3 mule...
Re: 26c3 mule...
Pictures
pics... *PIC*
(looking back at those four pictures...
When work pressure lets up some,
It'll look the same...
Re: pics...
Re: pics...
Deflecting vs. letting go
I think that's pretty much it...
Re: Deflecting vs. letting go
Re: Deflecting vs. letting go
I didn't check with a metallurgist..
26c3 pictures vs. ward later...
not that much later...the 26c3 *PIC*
Tempered to 380F? *NM*
Re: Tempered to 380F?
and the ward *PIC*
Request
Sure...
Temper temperature...
too much?
Re: Sure... *PIC*
Re: Sure...
David's knife
Re: David's knife
short follow up thought....
Re: short follow up thought....
Re: short follow up thought....
Re: Sure...
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