Hand Tools Archive

Subject:
Aim Hardness for 3V
Response To:
Good catch! *LINK* ()

Steve Elliott
For example, the usual recommended working hardness range of CPM 3V can be lower than some of the O1 hand tool blades in everyday use at 60-62 HRC; 58-60 HRC, say, for 3V, but the gain in edge toughness and resistance to brittleness and chipping greatly overtakes other steels in this respect.

I've tested CPM 3V blades at Rc 61 and Rc 59 and the harder blade had significantly better edge retention. For general use the manufacturer recommends an aim hardness of Rc 58-60 but high performance knife makers have found that a higher austenitizing temperature and final tempering at about 950 F give better performance for knives. I've found the same to be true for plane blades.

A few months ago I had an email exchange with a maker of violin knives who was testing 3V and using his own furnace to heat treat the blades. He wasn't able to get the blade hard enough to be satisfactory and ended up having excellent results hardening O1 blades to Rc 64.

Now that Paul Bos has retired I'll need to find a new heat treater for any blades I make. I have some notes from a conversation with Paul and will be glad to share heat treatment details with anyone interested.

Messages In This Thread

CPM 3V vs. CPM M4 ?
Aaaaaaaaaaahhhhhhhhhhhhh!!!!!!!!!!!!!!!!!!!!!!!!!!
Re: Aaaaaaaaaaahhhhhhhhhhhhh!!!!!!!!!!!!!!!!!!!!!!
Re: Aaaaaaaaaaahhhhhhhhhhhhh!!!!!!!!!!!!!!!!!!!!!!
Re:Length of thread
Re:Length of thread
How do you sharpen your nib,Marv? *NM*
Re: How do you sharpen your nib,Marv?
What good would a short answer do? :D *NM*
Yet another new metal (long)
Priceless
Way to go Bill !
(Message Deleted by Poster)
Re: Sticks and stones... sounds like woodworking
(Message Deleted by Poster)
Re: Bravo!
(Message Deleted by Poster)
Re: Bravo!
Christ all mighty...
Finally!
So...
Your moderator, reading this subthread... *NM* *PIC*
But Bee-wee,we wuv you...
Re: But Bee-wee,we wuv you...
"...but I know he does..."
We do what we can
Re: CPM 3V vs. CPM M4 ?
that is the problem
Re: CPM 3V vs. CPM M4 ?
Re: CPM 3V vs. CPM M4 ?
Re: CPM 3V vs. CPM M4 ?
Re: CPM 3V vs. CPM M4 ?
Re: CPM 3V vs. CPM M4 ?
Re: CPM 3V vs. CPM M4 ?
Re: CPM 3V vs. CPM M4 ?
to repeat a chisel dulling discussion
Re: to repeat a chisel dulling discussion
Re: CPM 3V vs. CPM M4 ?
I`m just happy...
Wait...
Metals
Re: Metals
must consider the whole process
Re: Metals
Re: Metals
As my dentist once said...
Bring on the Novocaine! A brief missive.
Cr-V question, then...
Re: Cr-V question, then...
realize significant gains???
View from the peanut gallery
In a nutshell (well, for me, anyway)
hardness, toughness
Re: hardness, toughness
could you explain the numbers?
You bet.
Re: You bet.
Re: You bet.
Re: You bet.
Re: You bet.
Where on earth? What on earth? Huh? Say whuh?
Since when has mass acceptance and ...
Re: Since when has mass acceptance and ...
Those are the numbers! *LINK*
Re: Those are the numbers!
I'm confused, Warren
Re: I'm confused, Warren
Re: Those are the numbers!
I'm impressed!
Re: I'm impressed!
"Sherman, set the Way Back machine for... "
Re: "Sherman, set the Way Back machine for... "
Why diamond wheels aren't used to grind steel
Re: diamond wheels - that's what I was after
Grinding Temperatures
Steve knows stuff.
Diamond wheels? Who brought up diamond wheels?
Re: Diamond wheels? Who brought up diamond wheels?
Your closing line reminds me of Dan O'Neill,
There I went again.
Re: There I went again.
Well, I was thinking about a diamond wheel. :) *NM*
Re: The diamond and HSS thing...
Re: The diamond and HSS thing...
Re: The diamond and HSS thing...
It's not so much a file protection thing as a... *LINK*
Just out of curiosity,
Re: Just out of curiosity,
Re: Just out of curiosity,
Re: "Sherman, set the Way Back machine for... "
Can you expand this thought Warren?
Good catch! *LINK*
Aim Hardness for 3V
Interesting and valuable *LINK*
3V Heat Treatment Schedule
Very helpful, Steve
Cryo
"How ya gonna keep 'em down on the farm... "
The good stuff
I like bacon. :@) *NM*
Re: I like bacon. :@)
Gotta agree Warren
Re: The good stuff
Re: The good stuff
Re: "How ya gonna keep 'em down on the farm... "
Heat treating -- the simple and not so simple
Re: Heat treating -- the simple and not so simple
Tom's right, Pam -- but wait! There's more! *LINK*
Re: Tom's right, Pam -- but wait! There's more!
Re: Tom's right, Pam -- but wait! There's more!
Re: Tom's right, Pam -- but wait! There's more!
Steps to completion
Thanks, Bob, understood. *NM*
Re: Tom's right, Pam -- but wait! There's more!
Work hardening?
Re: Work hardening?
Re: Tom's right, Pam -- but wait! There's more!
"All your base are belong to us"
Re: realize significant gains???
BTW #2
Re: BTW #2
Suggestions Larry? *NM*
Let he who is without sin...
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
A model for decision-making
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: realize significant gains???
Re: Bring on the Novocaine! A brief missive.
Hi, Andrew! (and a couple things I left out above)
Re: Hi, Andrew! How do they make ...
Here ya go, George. *LINK*
Re:Thanks David, now I know.... *NM*
Different worlds,different approaches
Re: As my dentist once said...
Tow truck? Who needs a tow truck? *LINK*
Re: Tow truck? Who needs a tow truck?
Oh, see? I handed you a straight line back :D *NM*
Re: Metals
Re: Metals
Re: Metals
Re: Metals
Re: CPM 3V vs. CPM M4 ?
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