Hand Tools Archive

Subject:
You bet.

David Barnett
Sure, Dan. Lets look at O1. From Phil's chart, you'll see that when O1 is hardened and quenched, it will be 65 HRC (Rockwell 'C' hardness). When you temper it at 300 F, you'll end up with a hardness of 64 HRC, nice and hard, but with poor resistance to impact, as expressed in foot pounds required to notch it. What you want, of course, is a good hardness and higher toughness (and with diamond for honing, you may as well say the-higher-the-better); that is, resistance to impact, wear and chipping. The Charpy notch tests are comparative, so 30 ft lbs notch resistance at 62 HRC is much better than 14 ft lbs at the harder 64 HRC.

It's a balancing act. Generally, you'll be more satisfied with 62 HRC if it has sufficient toughness (30 ft lbs) than you would be with 64 HRC at half that toughness. That's a big difference in toughness, by the way -- a difference that really makes a difference.

Now look at CPM 3V. At 60 HRC this steel takes a whopping 70 ft lbs notched impact, double O1's toughness at that hardness. 3V at 62 HRC is still 1/3rd better than O1 at that same hardness. This is nothing to scoff at (also, Steve Elliot posted earlier today that there's some wiggle room for even higher hardnesses while retaining superior toughness). Consider the other advantages of 3V, such as the ability to take red grinding heat without drawing its temper, and you can readily see the attraction.

Read what Phil says about A2, and compare that to 3V, as well. Still, it's not just about the numbers. They're here because Warren requested them. With affordable diamond to hone them, these powder HS steels are proving themselves in hand tools, offering a viable and reliable upgrade to older steels. Again, if you don't need them, fine. But if you do, it's nice to know that toolmakers have learned to effectively use these steels, and that tools made from them are becoming easier to find and afford.

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 !
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Re: Sticks and stones... sounds like woodworking
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Re: Bravo!
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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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