Pros/cons of CPM 420V versus 440V

rdangerer

rdangerer

Joined
May 26, 2000
Messages
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Would like to hear from users or custom makers who have used both CPM 420V and CPM 440V.

Does 440V have any real benefits vs. 420V still, e.g. some mild corrosion resistance benefits? Anything else?

Comments on optimal hardness for edge holding while staying below the brittle range?

From a Sal Glesser post:
"Crucible has changed the designation (name?) of the Stainless CPM materials.
CPM-440V is now called CPM-S60V
CPM-420V is now called CPM-S90V
The "S" signifies Stainless Steel
The 60V refers to the almost 6% vanadium in 440V
The 90V refers to the almost 9% vanadium in 420V"

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rdangerer@home.com
 
Just to the right and under the 'post a reply' site is another wonderful site. It is called the 'search' site. Enter '440V' in the search engine, and you will get forty seven (47) threads concerning CPM440V.

Hope this helps, Walt
 
Thanks for sharing. MT LCC DA shoud have blade of S90V. I have wondered what is this S90V - now I know.
 
Rdangerer, I have asked the same question. Based on what I have read my impression is that S90V is supposed to be at least as tough or tougher, at least as corrosion resistant or more and definately more wear resistant than S60V. So basically it is a direct improvement in regards to being a blade steel. I have however seen no direct comparison between the two in use to confirm this.

-Cliff
 
I don't have a lot of direct comparison experience to relate, but with 440V, there are some concerns about toughness that are expressed by people from time to time, especially in thin blades or fine edges.

I have never heard or experienced anything negative about 420V. It seems extremely tough, and seems to hold an edge forever.

The original rumor was that 420V was to make 440V obsolete, but they decided to keep making both for some reason. Perhaps the greater corrosion resistance in 440V.
 
personal experience.....420V is considerably tougher than 440V....HOWEVER!!!!! because both are very hard and take a super nice thin edge, from what i have seen (SO FAR) they are BOTH brittle.....440v moreso.... just the facts maam. I might add that this has been a surprise, but I havent made a lot of 420V blades so far....brittle is a relative term....brittle as compared to ATS for example, the very edge is brittle, it can chip, even if very slightly, as so I judge it as brittle....it sure cuts well.

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http://www.mayoknives.com




[This message has been edited by tom mayo (edited 06-19-2000).]
 
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