Pictures of Kershaw knives

Blur S60V Stone-Washed.
Click on picture for larger view.






Special Thanks Goes Out to Thomas W.
 
IMG_0076.jpg


IMG_0079.jpg


IMG_0080.jpg


IMG_0084.jpg


IMG_0088.jpg
 
Experiment with gloves...

Kershaw-ZT302-024.jpg


Kershaw-ZT302-025.jpg


Kershaw_Tyrade_007.jpg


Kershaw_Tyrade_006.jpg


I think I did better job straitening Tyrade then ZT302...

Thanks, Vassili.
 
topspeclt said:
I must say you have a lot of courage to sharpen and change the shape of those expensive knives!
Click to expand...

Well, now that you bring it up...

Boazeroedgefar.jpg


Boazeroedgeclose.jpg


This is my first attempt at combining the edge bevel with the primary grind, otherwise known as a "zero edge". Unfortunately CPM S60V is the wrong steel type for that kind of edge (too soft, it would bend instead of cut).

With a ten degree per side micro bevel the knife works wonderfully, and the opening slot I made out of the decorative holes works pretty well too.
 
Joshua J. said:
Well, now that you bring it up...

This is my first attempt at combining the edge bevel with the primary grind, otherwise known as a "zero edge". Unfortunately CPM S60V is the wrong steel type for that kind of edge (too soft, it would bend instead of cut).

With a ten degree per side micro bevel the knife works wonderfully, and the opening slot I made out of the decorative holes works pretty well too.
Click to expand...

I didn't realise that S60V was 'soft' - does that mean it's edge retention isn't as good as S30V or even 440C?

I made a zero edge with my survival knife, I found that it became a little too vunerable to bending (the edge).

Is there anyway you can get the black coating on again?
 
First off, I'm learning that almost any steel type currently available isn't hard enough to sharpen at those angles, ZDP-189 is still too flexible when it's that thin.
As for the black coating, it's gone, and I'm fine with that.
I gave it an ok mirror polish, at least it's shiny.
 
topspeclt said:
I didn't realise that S60V was 'soft' - does that mean it's edge retention isn't as good as S30V or even 440C?
Click to expand...

I had never heard that before either. S60V has more Carbon (2.15% vs. 1.45%), more Chromium (17% vs. 14%), more Vanadium (5.5% vs. 4%), and less Molybdenum (0.4% vs. 2%) than S30V. It is generally considered to have greater wear resistance than S30V, but S30V is tougher. Based on this recipe, I wouldn't have thought it would behave as described.

ETA: Most reports I have seen indicate that S60V is more prone to chip out, but this may be a function of the specific heat treat.
 
Last edited:
rbmcmjr said:
I had never heard that before either. S60V has more Carbon (2.15% vs. 1.45%), more Chromium (17% vs. 14%), more Vanadium (5.5% vs. 4%), and less Molybdenum (0.4% vs. 2%) than S30V. It is generally considered to have greater wear resistance than S30V, but S30V is tougher. Based on this recipe, I wouldn't have thought it would behave as described.

ETA: Most reports I have seen indicate that S60V is more prone to chip out, but this may be a function of the specific heat treat.
Click to expand...

Thanks for that insight into the S30V and S60V steels.

I think what Joshua originally meant is that the edge angle is so small even SX0V is too soft to hold the edge properly.
 
Allow me to elaborate, Generally CPM S60V is heat treated to Rc55-57, compared to Rc60 which is what you usually aim for with high end steel (or higher with some steel types).

At Rc60 CPM S60V was known to chip out, so the solution was to lower hardness. It still has exceptional wear resistance, however in some applications hardness is more important, like keeping an extremely shallow edge angle.

I'm waiting for something in the Rc70 range to try again.
 
Joshua J. said:
Allow me to elaborate, Generally CPM S60V is heat treated to Rc55-57, compared to Rc60 which is what you usually aim for with high end steel (or higher with some steel types).

At Rc60 CPM S60V was known to chip out, so the solution was to lower hardness. It still has exceptional wear resistance, however in some applications hardness is more important, like keeping an extremely shallow edge angle.

I'm waiting for something in the Rc70 range to try again.
Click to expand...

I should add that CPM S60V 6 times more wear resistant then CPM S30V. I have number of CPM S60V and CPM S30V knives - CPM S30V chips more then CPM S60V especially on low angles. Also CPM S60V shows better results on my Manila rope Edge holding test:

http://playground.sun.com/~vasya/Manila-Rope-Results.html

CPM S30V is only better in Price for manufacturers and Easy to Grind for manufacturers.

I hope this trend to use more profitable steels will ended in US - abroad everybody using better steel and Italian start producing CPM S125V knives now.

Kershaw is different and always try to be on the front line of knife technologies, but US knife industry I guess pulling even Kershaw back... I hope they will start using CPM S90V as well as CPM S125V.

Thanks, Vassili.
 
nozh2002 said:
[...] abroad everybody using better steel and Italian start producing CPM S125V knives now. [...]
Click to expand...
Really? "Everybody?" Do they not offer any of these super knives for sale on the Internet? A Google search for S125V yielded 356 hits; not a single hit was linked to anything for sale.

A search for S90V resulted in 18,500 hits, with 43 knives for sale. (They were ALL for the Spyderco Military C36CF90. :rolleyes: )
 
S60V is also no longer available as Crucibles determined S30V was an all around
better steel. Not my statement, Crucibles.

Spiderco's tests show that ZDP189 and S90V are basically identical in cut tests.
Not my tests, Spiderco's.

S125V is not available on any production knife that I can find. Although Thomas
stated that they have played around with it and it's not been kicked off the table
for possible use latter.
 
nozh2002 said:
I should add that CPM S60V 6 times more wear resistant then CPM S30V. I have number of CPM S60V and CPM S30V knives - CPM S30V chips more then CPM S60V especially on low angles. Also CPM S60V shows better results on my Manila rope Edge holding test:

http://playground.sun.com/~vasya/Manila-Rope-Results.html

CPM S30V is only better in Price for manufacturers and Easy to Grind for manufacturers.

I hope this trend to use more profitable steels will ended in US - abroad everybody using better steel and Italian start producing CPM S125V knives now.

Kershaw is different and always try to be on the front line of knife technologies, but US knife industry I guess pulling even Kershaw back... I hope they will start using CPM S90V as well as CPM S125V.

Thanks, Vassili.
Click to expand...

And I hope the above trend to always express personal opinion as fact by some posters in these forums will soon end...:rolleyes:

Also, IMO any knife manufacturer that plans to stay in business for the long haul is not making their steel choices based on the preferences of a small subset of users but on the basis of the overall market and the very real need to turn a profit...

Ray :)
 
You must log in or register to reply here.
Back
Top