CPM 125v

gine

gine

Joined
Sep 2, 2007
Messages
1,169
This steel is the american answer to zdp-189.I wonder who the first company
will ani-up and use this steel.(sal)?:cool::thumbup:.Its the new super steel but it's a pain to grind.We will probibly have to wait till next year anyways to see it:( since there are already such new steels interduced such as zdp and s90v:thumbup:, which I am very happy with.If cpm 125 v is used I would love to see it in the police model and maybe the chinook 4.Or in a new model:D.Do all you steel junkies agree.:):thumbup:
 
gine--- Man, yer chomp'n at the bit. Yes, it will be interesting with the S125V steel and others like M-4, that you forgot to mention! I would like to see a A-2 tool steel blade on a folder, done right, on a Sprint Run also. I am very content with the ZDP and the CPM steels that I'm using now.
 
Don't get your hopes up.
Sal wanted to do a sprint run with the Native model a long time ago, unfortunately there is no way to manufacture knives with this material (until better methods are devised).

Sorry to be the bearer of bad news.

Phil Wilson is the only custom maker I've heard of that is willing to work with the steel, you might want to contact him if you want some.
 
Joshua J. said:
Don't get your hopes up.
Sal wanted to do a sprint run with the Native model a long time ago, unfortunately there is no way to manufacture knives with this material (until better methods are devised).

Sorry to be the bearer of bad news.

Phil Wilson is the only custom maker I've heard of that is willing to work with the steel, you might want to contact him if you want some.
Click to expand...

what is it about 125v that makes it so difficult/impossible to work with?
 
it has a ton of vanadium carbide. it's more wear resistant than S60V (440V), and Spyderco had new grinding wheels developed to machine that steel. Vassili has posted that it is 8 times more wear resistant than S30V.

edit-Bad memory, the 8 times is actually S90V. This link claims 25-50% more wear resistance of S90V over S60V (420V & 440V) http://www.plasticservices.com/ScrewsBarrels/bmat.htm
 
so, even if the rockwell hardness does not exceed the hardness of the wheel, the carbides are harder, thus making the grinding difficult?
 
That's how I understand it, Dr. Morimotom. Wait for the Techies to chime in.
 
MORIMOTOM said:
so, even if the rockwell hardness does not exceed the hardness of the wheel, the carbides are harder, thus making the grinding difficult?
Click to expand...
I think the carbide volume for S125V is somewhere around 25%. A sizable amount of the knife edge is going to be carbide, including vanadium carbide-which is about as hard as aluminum oxide and silicon carbide-india/crystolon/wet or dry paper/grinding wheels/etc.
 
Lycosa said:
BD---I have a feeling. It's gonna happen---M-4!! Now, grab a napkin.
Click to expand...

What's so good about cpm m-4??
It's a step back from cpm s30v according to
steel chart.cpm s30v has more carbon chromium more vandium
more molyebdenum ect.:confused::confused:
 
gine said:
What's so good about cpm m-4??
It's a step back from cpm s30v according to
steel chart.cpm s30v has more carbon chromium more vandium
more molyebdenum ect.:confused::confused:
Click to expand...

CPM M4 is tougher with more wear resistance than S30V. They have virtually identical Carbon and Vanadium amounts, but M4 has more Moly and a good amount of tungsten. In my use it takes a better edge and holds a really sharp edge for longer, without chipping. M4 also can be heat treated to higher hardness. M4 is not stainless however, so you do have to wipe it down.

Check out the chart at the bottom of page 10 here for relative wear resistance and toughness: http://www.crucibleservice.com/datash/PlasticsBrochure.pdf?CFID=1743244&CFTOKEN=16836795

The steel compositions are a few pages back.

Mike
 
The big reason I like CPM M-4 is the high hardness, with high wear resistance, and a fine grain structure.
All the ingredients for a long lasting razor edge.

And it should be tougher than stainless steel types of similar performance.
 
gunmike1 said:
CPM M4 is tougher with more wear resistance than S30V. They have virtually identical Carbon and Vanadium amounts, but M4 has more Moly and a good amount of tungsten. In my use it takes a better edge and holds a really sharp edge for longer, without chipping. M4 also can be heat treated to higher hardness. M4 is not stainless however, so you do have to wipe it down.

Check out the chart at the bottom of page 10 here for relative wear resistance and toughness: http://www.crucibleservice.com/datash/PlasticsBrochure.pdf?CFID=1743244&CFTOKEN=16836795

The steel compositions are a few pages back.

Mike
Click to expand...

How would you compare it to cpm d2?
D2 has a high hardness as well. m-4 has more vandium and tungsten.
d2 is also more stain resistant because it has higher chromium.
what does m-4 rockwell at cpm d2 is 62hrc is it higher then that.If it is rockwelled higher then 62 then I can see why it's favored.:D It would be tougher then d2 obously but I use my knives to cut not chop and pry.:thumbup:

thx gine.
 
That's why A2 tool steel would be a good choice for a slicer. I really like some of the stainless steels but not one has cut as long as my A2 blade.
 
CPM M-4 is usually run at Rc 63-64, according to Crucibles documentation.
While being harder than D-2 (Rc 60), it is also more than twice as wear resistant, and significantly tougher (20-30%).

Comparing to CPM D-2 might close the gap in toughness, and a little on hardness, but it still wouldn't come close in wear resistance.

I just like the overall package offered with CPM M-4.

Here's the charts for the two steel types.
D-2 (regular, not the CPM variant)
http://www.crucibleservice.com/datash/ACFC3C.pdf?CFID=1744037&CFTOKEN=58209911

CPM M-4
http://www.crucibleservice.com/datash/dsM4v8.pdf?CFID=1744037&CFTOKEN=58209911
 
Lycosa said:
That's why A2 tool steel would be a good choice for a slicer. I really like some of the stainless steels but not one has cut as long as my A2 blade.
Click to expand...

zdp -189 cpm-s90v cpm125v and cpm m-4 would all have better edge life then a2.A2 would be tougher then all exept m-4.
 
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