Are CPM 154 and CPM D2 worth the higher prices over 154cm and plain old D2?

Discussion in 'General Knife Discussion' started by AshesFall, Feb 10, 2020.

  1. AshesFall


    Jul 16, 2019
    I know there's a difference and that the CPM versions are finer grained in structure and are slightly superior in edge retention, but are they really worth the higher pricetag?
  2. Blues Bender

    Blues Bender Gold Member Gold Member

    Feb 27, 2014
    Yes, but I’m not sure where you’re seeing a huge price difference?
    Alberta Ed likes this.
  3. Lodd

    Lodd Gold Member Gold Member

    Jan 23, 2015
    Yes, but only if the maker / manufacturer knows what they're doing.
    tyyreaun likes this.
  4. tyyreaun

    tyyreaun Gold Member Gold Member

    Feb 26, 2017
    I think the main benefit of the finer structure is toughness, not edge retention. Someone more familiar with metallurgy can provide a better answer - I'm sure @Larrin has a link on the subject. In general, though, my understanding is that the smaller carbides in the PM version are less likely to chip out, letting you get sharper edges that are less prone to taking damage.

    Depending on the material you're cutting, that may or may not translate to longer edge retention, based on if the material is wearing away the steel itself, or knocking out carbide structures.
  5. hardheart


    Sep 19, 2001
    No. Changing edge angle, edge thickness, or hardness are much greater factors in initial sharpness and edge life. A direct comparison of 154CM & CPM154 showed this.
    TheEdge01, Eli Chaps and Larrin like this.
  6. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
  7. PirateSeulb

    PirateSeulb Gold Member Gold Member

    Jun 6, 2017
    The price difference in knives using A vs B is likely that higher end products are using the "nicer" CPM variants so they are more expensive in general.
    Blues Bender likes this.
  8. Zeunerite


    Dec 24, 2019
  9. dirc


    Jan 31, 2018
    the real answer, of course, depends on the situation:

    if you're going to spend many hours hand crafting the knife, the steel choice is a small % of the overall cost - and easily worth it (imho)

    if you're talking about a mass produced machine/automation setup, the steel choice is a much larger % (since other costs are much lower) - so, not really worth it

    ...some pm steel is much tougher (like double in some cases) than the non-pm version, read @Larrin 's blog/website
  10. superpog

    superpog Basic Member Basic Member

    Nov 9, 2019
    I will go with CPM154 on fixed blades, but for folders I don’t care.

    D2 is not for fixed blade to me, so don’t care on folders as well.
  11. TheEdge01


    Apr 3, 2015
    I doubt the person using the knife would tell much of a difference between them in an edc role. If the edge geometry, heat treat, etc were exactly the same, the CPM blades would probably hold up better if someone intentionally tried to dull the edge by pushing them to their limit in cardboard, carpet, or rope cutting tests. Like I said earlier, in an edc role, you shouldn’t have issues with any of them.
  12. TheTourist

    TheTourist Basic Member Basic Member

    Jun 23, 2019
    Yes, I prefer the finer grain idea. I polish my own edges and I've found that I can generate a mirror finish easier on the bevel--which translates into the same keen condition of the edge.

    For those who don't know, that name of "CPM" means the 'P' stands for 'particle.' I remeber when knife enthusiasts were taking quality cameras and photographing the edges of knives. These edges looked like a layer of broken glass.

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