CPM154 Over S90V Laminate Blade ?

skyhorse

skyhorse

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Jan 30, 2010
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I was looking at the New Graham web site " Outstanding BF Dealer " this morning and saw this great looking sprint run of the Manix 2.
https://newgraham.com/Manix-2-Carbon-Fiber-with-CPM154-over-S90V-Laminate-Blade-SC101CFPE2/
I was lucky enough to get a super blue Stretch with the stainless VG10 laminate over carbon steel super blue for rust protection. I realize everything Sal & Eric does is painfully thought out down to the very last detail , what I'm wondering is why laminate one stainless with another ?The only reason I've come up with and I'm likely wrong here , is the thinner S90V core would be easier to sharpen to a screaming sharp edge ? If my budget wasn't blown by recent illness I'd be on this one like white on rice. Any thoughts on this ?
 
My thought on this was that they did it mostly because it is cool and an example of Spyderco's production capabilities, which is perfectly fine by me. Your guess though makes some sense, and you may be on to something here. Either way, I would love to have the knife, and if the success of the PM2 with the same steel combo is any indication, it will be a sought-after blade.
 
Thanks for your thoughts jstn. :):thumbsup: Doing a laminated blade must be expensive , so I know there's a very good reason. In this case I'm not sure what it is ? :confused:
 
The Super Blue Stretch did not have VG10 on the outside, it was 420j1. The Hap40 Stretch used a different laminate than that, it used SUS410. The recent Caly3 in HAP40 used 420J2. It is my understanding that the laminate chosen must cooperate with the heat treat of the core steel. It is quite possible that CPM154 was chosen because it will work with a similar heat treatment as S90V. Also, some makers are equipped to work with it and others are not. It has been reported that one maker uses laminated zdp because the blade blanks can be stamped and solid zdp cannot.

As far as why laminates are used, I have heard quite a few reasons. Corrosion resistance is one. It also makes grinding the blades easier and more affordable. It also often sandwiches a harder stronger steel between two layers of softer tougher steel and gives you a similar result as differential hardening which is a better edge without sacrificing toughness of the blade.
 
Makes sense bear. I forgot what the laminate was on the Super Blue Stretch, thanks. Wow that knife takes a screaming edge,wish I'd bought the Delica in that sprint run as well .
 
IIRC, Ed Schemp requested Crucible create this domestic(USA) laminate. I am not a metalurgist (and I arnt a speller either) but perhaps a strong 154CM that is easier to polish and less likely to scratch over a more brittle S90V??? Just guessing.....
 
skyhorse said:
Doing a laminated blade must be expensive , so I know there's a very good reason.
Click to expand...

One reason is to make a tougher blade. Put a thin layer of hard but brittle steel in the middle, put steel on the outside that is less brittle. Then when the blade is bent rather than fracturing it can resist the stress and return to straight, or even yield a little bit. (The bending stress in the brittle center layer is less than the bending stress in the outer more ductile layers.)
 
The main reason was that Crucible was able to do it. It's not really just a cored laminate, there is a chemical boding of the two steels at the interface. Not quite like splitting the atom, but up there. They were able to make it and we were able to make a blade out of it. High tech stuff!

sal
 
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