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 Post subject: anyone use chef with cpm 20cv steel ?
PostPosted: Wed Oct 22, 2014 5:00 pm 

Joined: Wed Sep 04, 2013 3:16 pm
Posts: 128
Location: Oxford,MA
This is a stainless tool steel.
1.9% carbon
20% chromium
4% Vanadium

It is similiar to M390 and Carpenter CTS 204P

Anyone use knives of these steels? I am considering experimenting with some 20cv



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Tim Johnson
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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Wed Oct 22, 2014 5:42 pm 
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Joined: Thu Apr 26, 2012 5:13 pm
Posts: 2925
Location: CT
It may be really really difficult to grind, especially after HT if you don't have a variable speed grinder. I would check some other knifemaking forums and see how those guys are grinding it and their comments. Butch Harner uses some exotic steels from Carpenter, so he may have some insight about these steels. Last super steel I tried was M390; I thinned out a few M390 Artifex and it was a PITA to do. Thin blades flex a lot and are harder to grind, but thin steel and very wear resistant steels that flex are a royal PITA. Not sure how this steel stacks up to the others. If you try it out, do a couple small utility/hunting/petty type knives and see how it is.


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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Wed Oct 22, 2014 5:57 pm 

Joined: Wed Sep 04, 2013 3:16 pm
Posts: 128
Location: Oxford,MA
Ohh cool, I did not know there were some M390 artifex's about. Wonder how the owners like them? The 20cv is pretty much identical to M390 but lots cheaper. I am primarily interested in performance as a line knife or other hard used knife. From a makers standpoint , yes there are challenges as you point out. definitely a PITA steel but being air hardening I think you could finish 90% or more before heat treat.



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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Wed Oct 22, 2014 6:46 pm 
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I remember from the early days of S30V, CPM 10V, etc, some steels you needed variable speed to finish them after HT. The mantra was to get them pretty much done, HT, then remove the scale and clean them up.

Mark did a run of M390 knives thru Lamson; they were a PITA for Lamson to grind, even with computer controlled equipment. Randy Haas has worked with some of the K390 and other Super Steels, he may be able to give you some hands on advice, too!


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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Wed Oct 22, 2014 8:26 pm 

Joined: Sat Aug 24, 2013 2:42 am
Posts: 250
I have an M390 Artifex 210mm gyuto and it was way too thick.

Sent it to Ken who thinned it out while keeping the logo - pretty cool.

Sharpens like any super wear resistant steel & I like the edge retention but didn't care for the Artifex geometry in that steel. Seemed to be thicker than the ones in AEB-L.

Douglas


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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Wed Oct 22, 2014 9:16 pm 

Joined: Sun Aug 26, 2012 5:24 am
Posts: 379
Sharp Knives wrote: Sharpens like any super wear resistant steel & I like the edge retention but didn't care for the Artifex geometry in that steel. Seemed to be thicker than the ones in AEB-L.


Wow, thats saying something. The AEB-L ones are pretty damn thick.


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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Thu Oct 23, 2014 2:27 pm 

Joined: Wed Sep 04, 2013 3:16 pm
Posts: 128
Location: Oxford,MA
Thanks for the input guys. I am definately gonna test some of this out.



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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Thu Oct 23, 2014 3:55 pm 
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Lamson had some issues grinding them. The blades were thin enough to flex during grinding and when the steel is flexing away from the grinding apparatus, they don't get ground as thinly.

And the Artifex were designed as an entry level line knife with a thicker edge to withstand more use/abuse.


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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Thu Oct 23, 2014 4:57 pm 

Joined: Wed Sep 04, 2013 3:16 pm
Posts: 128
Location: Oxford,MA
Check out Don's WIP on the blades he recently completed. I think his method would work pretty good for this stuff. I myself will just go real slow and careful free hand and even up with sandpaper/backing board. Tim maybe this can be a collaboration blade?! Feel like doing a Wa on it when Im done? Wont be till december though.



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 Post subject: Re: anyone use chef with cpm 20cv steel ?
PostPosted: Thu Oct 23, 2014 5:02 pm 
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Sandpaper/backing board may be tough with these types of steels? What do you have for equipment Tim?


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