D2 project

CPM D2 is even used in at least one production knife by Spyderco. So it's available ,give Crucible a call.
 
Steven Penner said:
I believe CPM is trademark for Crucible Products
although i don't specifically see CPM D2 on their website
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Thanks Steven, I've been to their site and couldn't find mention of it either.

mete said:
CPM D2 is even used in at least one production knife by Spyderco. So it's available ,give Crucible a call.
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I've heard good things about this knife mete.

I think a call to Crucible is the only way to find out for sure whether or not it is indeed available to custom knifemakers in small quantities.

Stay tuned ;)
 
ib2v4u said:
When I get 4 pieces of 3/16+" D2 that are 12 1/2" x 39 1/2" for $400 I take em with the mill scale. I am sure I can get rid of the scale one way or the other. I have no doubts that some kind of acid will take care of the scale.
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Sorry to get your discussion about mill scale off topic ib2v4u.

I think you're right, I would find a way to deal with the scale at that cost too ;)
 
I don't know man. D2 without big nasty carbides? That'd be like Europe without the French. Sure, it would be better in some ways. Certainly less obnoxious. But I like the French (they did invent modern democracy), and I like the big nasty carbides.

I would see CPM D2 having good application in injection molds, where it is currently not practical to achieve a good SPI A1 finish with D2, due to an orange peel effect from the carbides (I believe). David would probably know more about this than anyone.



Steven Penner said:
Nathan

Cool photo - that's just good marketing.

What is the folder blade being cut?
Chinese - 420 ???
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Yeah, that would be good marketing. And like much marketing, it is a bit disingenuous. It leads the viewer to believe that the D2 blade cut the other blade in half (S&W 440, most likely 440A). It didn't. The harder D2, with a compressive yield point at a very impressive 320KSI managed to cut through the softer 440 (probably in the neighborhood of 250KSI YP) until it got up to the thicker part of the main bevel. At that point, the thin edge of the D2 met its match against the thickening cross section of the weak, but tough, softer steel. At that point the edge on the D2 began to yield, and an instant later the entire blade broke. Those big nasty carbides do nothing in this application except perhaps to act as stress risers. And any steel, at HRC62 is going to cut another steel at probably 56. Made a fun pict, though it proves nothing.

But now I'm hijacking this thread again...
 
The hijacks are fine. I am learning some interesting stuff here and thats the point. I do have a couple questions for the resident D2 guy though. LOL. Yes, you Nathan. I figured out I need to get my finish farther at least to just 400 grit scratches. What do I use on this stuff after it is done with its HT. Best belts for hard D2. Also. I put it in a envelopes of SS foil and did dbl folds on all the seam, had a small oiece of cardboard in each envelope. It comes out of the HT bluish gray. Is this normal? When highly polished I can see like a web all over the blade. Is this some kind of alloy banding, the carbides or what. Thanks Jim
 
mete said:
CPM D2 is even used in at least one production knife by Spyderco. So it's available ,give Crucible a call.
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Kershaw also uses it in their composite blades, its sandwiched between Sandvik 13C26 or 154CM San Mai style.
 
ib2v4u said:
The hijacks are fine. I am learning some interesting stuff here and thats the point. I do have a couple questions for the resident D2 guy though. LOL. Yes, you Nathan. I figured out I need to get my finish farther at least to just 400 grit scratches. What do I use on this stuff after it is done with its HT. Best belts for hard D2. Also. I put it in a envelopes of SS foil and did dbl folds on all the seam, had a small oiece of cardboard in each envelope. It comes out of the HT bluish gray. Is this normal? When highly polished I can see like a web all over the blade. Is this some kind of alloy banding, the carbides or what. Thanks Jim
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Oh, I'm not a resident D2 expert, LOL. More like an egg spurt. Ask me a question about CNC...

I believe D2 is something like 15% carbide by volume. Does that sound right mete? Yeah, that really fine swirly* looking stuff is normal, and becomes visible at higher finishes. It will look like wootz if you etch it.

I don't use anything inside my envelope. It comes out light grey with a couple colored spots.

I'm not a belt grinder expert by any means. I've been taking D2 to a 600 grit finish, then applying a green scotchbrite belt. I like this finish. I've done a few with hand rub finish to 600 with good results too. Butch gets good finishes on D2 off his grinder, perhaps he could chime in here?

I'd suggest you talk to Pop about your best belt choices.
 
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Yes , some where close to 15 % carbides....You'll never get all the oxygen out of the envelope and things in the cardboard may react with the steel also.Typically you'll get some oxidation as discolorization. Easily removed.
 
jll346 said:
I ordered a couple hundred dollars of 1080 and it had the mill scale on it. After about two blanks...I sold all of it. I will never buy steel again unless it is surface ground. What a pain in the ***!
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I hear ya on that brother... I hate that stuff....

I've just started with Crucible as a dealer and I have some CPM-D2 on order. I intend to make a few knives out of it as soon as it comes in. D2 is a great all around steel. I think the CPM process will take it even further. I'm excited about giving the stuff a try.
 
fitzo said:
Chuck Bybee has it, David.
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Had it ;) I got his update notification and all of the CPM D2 was gone by the time I checked :grumpy: .....and that was the same day I got notification. I've never been what you would call.... "quick on the draw" :)


tmickley said:
I've just started with Crucible as a dealer and I have some CPM-D2 on order.
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I want some ! Put me down, seriously Tracy. I'll be in touch :thumbup:

Nathan the Machinist said:
I don't use anything inside my envelope. It comes out light grey with a couple colored spots.
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I don't either, and they always come out great ! In fact, I never had issues until I tried some paper inside the envelope. I tried it a couple times and then went back to nothing but air inside the envelope, that and the blade ;)

And Nathan, I never used much D2 when making molds. Most of the cavity was made using H13, in fact, I can't remember using anything but
 
Ahhh, sweet...

batch1002b.jpg
 
David Wesner said:
I really want to get some of this CPM D2. BAD ! Any recommendations as to where to get it ?
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since you live in michigan you can use the same guy I am going to use. I am in contact with the guy incharge of getting knife makers the steel they want. He works at the crucible plant here in Grand rapids he is a great guy, I have talked with him and he can get you the cpm steel you want cheaper than anywhere else because he cuts out the middle man. if your interested just PM me and I'll give you his E-mail.
 
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