What exactly is the difference between....

i am assuming that s30v is a brand name of CPM's so it's impossible for someone else to make s30v and call it that.
 
S30V is made only by CPM. CPM also makes steels that are more common with their powder metallurgy method. These are denoted as CPM154 (their version of 154CM) and CPM D2 (their version of D2)
 
They have their own proprietary particle technique (powdered mix) with which they make the steel, making for better grain structure from what I've been told. I'm not an expert or a knife maker, but I believe I've heard that that's why people like the "CPM" steels better than non CPM.
 
res1cue said:
S30V is made only by CPM. CPM also makes steels that are more common with their powder metallurgy method. These are denoted as CPM154 (their version of 154CM) and CPM D2 (their version of D2)
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All 154CM is CPM 154CM
 
I thought the CPM was "Crucible Powdered Metallurgy", meaning that it is a powdered steel... Crucible Materials Corporation is the company.
 
docbp87 said:
I thought the CPM was "Crucible Powdered Metallurgy", meaning that it is a powdered steel... Crucible Materials Corporation is the company.
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You are correct. The CPM part is the process by which the steel is alloyed/made.

As ar as CPM-154CM, that does not exist. It's a typo made across the board on specs on knives. It's either 154CM or CPM-154.
 
Crucible makes both an ingot 154CM and a powdered metal version called CPM 154. Although the alloy is the same in both cases, the grain structure of the powdered version is finer which confers benefits that make it superior to the ingot form. S30V, on the other hand, is only made by the powdered process, and only by Crucible under that name, although Carpenter makes a very similar alloy, also via the particle process.
 
RevDevil said:
You are correct. The CPM part is the process by which the steel is alloyed/made.

As ar as CPM-154CM, that does not exist. It's a typo made across the board on specs on knives. It's either 154CM or CPM-154.
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I assume the "CM" on the end of "154CM" stands for "Crucible Materials", so in their minds it's probably just "that steel designated by the number 154" which is why they didn't bother keeping the "CM" when they made "CPM154".

(I just got that straightened out in my head, that name has been confusing me for years.)
 
RevDevil said:
You are correct. The CPM part is the process by which the steel is alloyed/made.

As ar as CPM-154CM, that does not exist. It's a typo made across the board on specs on knives. It's either 154CM or CPM-154.
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I won't even buy a knife or anything else from a maker or store that labels CPM 154 as CPM 154CM... ;)
 
Are you sure? I was under the impression that the CM meant CroMoly. Hitachi allegedly copied it and called it ATS-34. If Crucible's charts are to be believed, the particle metallurgy version CPM 154CM is supposed to be superior by a fair margin, especially in impact resistance. Small grain size will do that for you. I have seen it show up in a fair number of "hard use" knives. IIRC, Jerry Hossom told me that another good thing about CPM 154 is that it seems to polish up a lot better than some of the other PM "super steels"
Joshua J. said:
I assume the "CM" on the end of "154CM" stands for "Crucible Materials", so in their minds it's probably just "that steel designated by the number 154" which is why they didn't bother keeping the "CM" when they made "CPM154".

(I just got that straightened out in my head, that name has been confusing me for years.)
Click to expand...
 
correct me if i'm wrong but a PM steel is slightly lighter than an ingot steel of the same components (due to air?)
 
Ankerson said:
I won't even buy a knife or anything else from a maker or store that labels CPM 154 as CPM 154CM... ;)
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I've noticed that a ton of online shops have made that mistake, specifically with customs. Not sure if they just print what the makers give them as the spec sheets, but it would appear so.
 
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