CPM 420V or D2 ? Which would you choose and why?

[jbmonkey]

Yeah, it is a zombie thread alright.

Crucible has brought back CPM S60V/440V after it being discontinued for almost decade or so.

good. a great steel that never should have left cutlery.

to the reanimator......yep 16 year old thread to say you like d2 and its easy for you to get sharp. wow. least we learned 440v/s60v is back in production, so for that thanks.

 

[Mo2]

420V is s90v iirc. I'd choose that over d2 any day. D2 is great when heat treatment is properly done and sharpened. But s90v has far longer edge retention and is overall better. Both can rust but s90v takes the edge of being more stain resistant. Both take a long time to sharpen. Highly recommend diamonds or cbn for sharpening.

D2 is tougher than s90v at higher hardness but I wouldn't use these to baton or chop with. Leave that to 3v or other high toughness steels.

https://www.crucible.com/eselector/prodbyapp/plastics/s90vp.html

Also what type of D2 is the maker using? D2, cpm d2, psf27, etc? There are about 50+ different compositions of D2.

I like D-2. I can put a wicked edge on it, and it holds up to what ever I throw at it. A good "old school" steel.

WTF this thread is from 2002. So many d2 threads since then. Why not make a new thread or bump a newer thread instead?

 

[scottyj]

420V is s90v iirc. I'd choose that over d2 any day. D2 is great when heat treatment is properly done and sharpened. But s90v has far longer edge retention and is overall better. Both can rust but s90v takes the edge of being more stain resistant. Both take a long time to sharpen. Highly recommend diamonds or cbn for sharpening.

D2 is tougher than s90v at higher hardness but I wouldn't use these to baton or chop with. Leave that to 3v or other high toughness steels.

https://www.crucible.com/eselector/prodbyapp/plastics/s90vp.html

Also what type of D2 is the maker using? D2, cpm d2, psf27, etc? There are about 50+ different compositions of D2.



WTF this thread is from 2002. So many d2 threads since then. Why not make a new thread or bump a newer thread instead?

Lol. I was bored on here, so out of curiosity I went to the oldest page, and looked up the oldest thread. It was about D-2 steel. I can sharpen it pretty good so I mentioned it. Plus I like the year 2002.....my kid was born that year.

 

[David Martin]

OK, I've got a question regarding the "need" for diamond for sharpening 420V, or any high-vanadium-content steel: WHY? It is said that because the vanadium carbides are so hard (80+ at least?), you need diamond to cut them. However, I don't understand this, when it would seem that the size of the diamond particles would be something like an order of magnitude larger than the vanadium carbides. Wouldn't that be sort-of like trying to shape, say, plastic marbles with a stone wall? Could someone please explain? Or am I totally screwed up on the relative sizes?

No, this is totally correct. In order to affect the vanadium carbides because of their size one has to go to the XX fine diamond plate. If your
not going to sharpen to this level then use a SiC stone and take it to 3-400 grit like Jim Ankerson. He gets great results. I have knives in D2, s60v & s90v and sharpen them on SiC and diamond. Up to 500 grit on SiC and my fine diamond goes to 600. This grit is too large to do much in shaping the VC. Still, the blades get sharp and I use them. For a long time. Yes, this is an old topic. DM

 

[emjay4248]

According to Crucible 420v is S90V:
CPM® S90V (420V)
(AISI 420 modified with high vanadium)
If that is really the case then sharpening it will be a bitch and if that is the case I would splurge and get a knife in M390. So far I thing it is absolutely the best combination of characteristics of any steel that I have owned. D2 is a really good steel but you have to remember that it is not as stain resistant as the others and needs to be oiled occasionally. If your choice is only your 2 choices I would decide what I am doing with it. if it is going to be an EDC knife then I vote D2, If it's an occasional user then you can go for the 420. As I said before if you want a blade that will hold it's edge for a long time that is easy to sharpen get M390

 

[navman]

hopefully he was able to find what he was looking for over the last 16 years

Geode , which did you decide on?