Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Larrin, Dec 2, 2019.

  1. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    nsm, Storm W, bluntcut and 8 others like this.
  2. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013
    I really enjoyed this one, as these are steels I am quite interested in, and have a few to play with.

    Chuck is sending me some z-max to try. I think it’s very similar to Maxamet, so I’ll send some samples in for testing.

    I have a question on wear resistance. I see double the edge retention from W2 or 52100 compared to z-wear, at typical hardness levels. Maxamet to 440c seems a bit under represented in terms of improvement at 2.2. (Iirc.) Am I talking about something different?
     
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  3. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    Nope you are correct. W2 and 52100 have half the edge retention of 440C, so Z-Wear is probably at least twice as good.
     
  4. Natlek

    Natlek

    Jun 9, 2015
    Edge retention test /the way it is done /don t tell the whole story if you ask me ....AFTER retention test stop HSS blade will stay in THAT sharpness /if we continue test / for many times longer then say 440C .440C will go rapid in losing it s sharpness if test continue . HSS no...........
     
  5. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013
    ah, I forgot 440c has those big carbides.
     
    Nick Dunham likes this.
  6. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    We didn’t ask you.

    Hoss
     
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  7. Natlek

    Natlek

    Jun 9, 2015
    Funny guy :D Nor did I want your opinion on my post :p
     
  8. Natlek

    Natlek

    Jun 9, 2015
    So , WHO are We ?? Does that mean that www.bladeforums.com don t want me to post my opinion ?
     
  9. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    Your words “if you ask me”, I said we didn’t ask you.

    Hoss
     
    ten-six and Taqtaq like this.
  10. Natlek

    Natlek

    Jun 9, 2015
    Aha ..................I see it now , funny guy :thumbsdown:
     
  11. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    You rarely add anything useful to threads.

    Hoss
     
    ten-six and butcher_block like this.
  12. Natlek

    Natlek

    Jun 9, 2015
    What are persistent guy you are :eek: What are you here ? Judge ? You get boring , you know that ? If you have something on topic to add ..be mu guest .You can start with ...what si not correct in my IF YOU ASK ME post .If you have noting to add, you know ........... :D Or I need to press report button,Troll :D
     
  13. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    You have done no real testing of knives or edge holding but you gave your opinion which is useless.

    Hoss
     
    ten-six likes this.
  14. Natlek

    Natlek

    Jun 9, 2015
    And you got that information from this lady , I guess ? Can you ASK her for next lotto numbers , please :D And stop trolling this thread . . .

    [​IMG]
     
  15. Mecha

    Mecha Titanium Bladesmith Knifemaker / Craftsman / Service Provider

    Dec 27, 2013
    Nevermind.
     
    Last edited: Dec 2, 2019
  16. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    Show us your testing and your results.

    Hoss
     
    ten-six likes this.
  17. Thomas Linton

    Thomas Linton

    Jun 16, 2003
    Thank Spark for "Ignore."
     
    ten-six likes this.
  18. Randy3000

    Randy3000

    791
    Jun 3, 2017
    Beyond relative ease of heat treatment, is there any reason NOT to use one of these super hard steels for the vast majority of knives?
     
    Hengelo_77 likes this.
  19. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    High cost, low toughness, difficult to finish and sharpen, and low availability are some reasons. They are not for the average knife user.

    Hoss
     
  20. Richard Coyle

    Richard Coyle Gold Member Gold Member

    39
    Nov 12, 2019
    This is probably a super noobie question, but what does “high speed” mean. Why are they called “high speed” steels?
     

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