Call for Charpy toughness samples

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Larrin, Jan 26, 2018.

  1. rodriguez7

    rodriguez7 Gila wilderness knife works Knifemaker / Craftsman / Service Provider

    Feb 1, 2009
    I’m interested in the A8 results. Were these done with low temper? I’m pretty sure busse uses a higher temper, somewhere around 900 degrees. I would like to see both results just for the heck of it. Also did you ever send a lower hardness ztuff sample to Larrin? I’m curious about a sample at 58-59 with low temper.
     
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  2. Willie71

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

    Feb 23, 2013
    I will be doing high temper a8mod, and samples with the ramp that’s recommended too. Z-tuff lower hardness sample is in the batch coming up with s7 and 1v. I have to order some more z-tuff, as I’m making another knife out of my remaining supply. :rolleyes: I have enough for one, maybe two samples left.
     
  3. hugofeynman

    hugofeynman Gold Member Gold Member

    593
    Jan 18, 2011
    Any news from the gentleman who is grinding Ultrafort and NZ3, Warren?

    A8mod, S7, 1V, NZ3, Ultrafort and 58/59hrc Ztuff are all contenders for the toughest steel good for knifemaking. Let the party begin!:D
     
    Last edited: Jul 16, 2019
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  4. Willie71

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

    Feb 23, 2013
    Larrin contacted him about a month ago, I think. Not done yet.
     
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  5. hugofeynman

    hugofeynman Gold Member Gold Member

    593
    Jan 18, 2011
    Let’s hope he can arrange some time to grind those specimens, for the good of science.
     
    Willie71 likes this.
  6. Salival

    Salival

    72
    Apr 9, 2014
    Hey people!
    Any news? I have 2 custom blades in Ztuff incoming...with 2 diff hardness.
    The curiosity is even higher now!
     
  7. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    S30V, Nitro-V, 10V, and Maxamet were added to the toughness charts in the recent O1 article.
     
    kdnolin, Salival, Willie71 and 3 others like this.
  8. Willie71

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

    Feb 23, 2013
    We have two sets of samples awaiting grinding that have been out for months. If life is just too busy, please send them back to me or Larrin, so we can arrange grinding of these samples.

    I have another batch almost ready to send out, which includes a8mod, 440b, more M4, 1V, and s7.
     
  9. Salival

    Salival

    72
    Apr 9, 2014
    Cool guys.
    Have you already sent the Ztuff with lower hardness?
     
    rodriguez7 likes this.
  10. Jason Volkert

    Jason Volkert KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    243
    Nov 25, 2018
    That's crazy.
     
  11. Willie71

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

    Feb 23, 2013
    I did a range, but we will probably not be lower than Rc59. Cryo seems to bump hardness up a couple points from the datasheets. I have another stick on the way to try lower hardness samples, along with 1V, and S7.
     
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  12. hugofeynman

    hugofeynman Gold Member Gold Member

    593
    Jan 18, 2011
    Warren, you’re the man.:thumbsup:
     
    Last edited: Aug 31, 2019
    Tin.Man likes this.
  13. Willie71

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

    Feb 23, 2013
    My apologies. I did not mean to stir anything up. ALL volunteer participation is appreciated. I get it, life gets in the way sometimes. I meant no criticism towards anyone.
     
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  14. rodriguez7

    rodriguez7 Gila wilderness knife works Knifemaker / Craftsman / Service Provider

    Feb 1, 2009
    I’ll be sending you a stick of ztuff when I get a chance. We’ll be aiming for 58 rc with this one. And I’m guessing it will smoke that higher hardness sample. Hopefully I’ll get it sent this next week sometime.
     
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  15. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    I added a test for Caldie and replaced the original Elmax value with a couple new tests that were done with Warren's samples.
    elmax toughness addition.jpg
    Caldie toughness addition.jpg
     
    Last edited: Oct 1, 2019
  16. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    I got notice yesterday that a volunteer surface grinder ruined a set of specimens I heat treated. I don't know which steels he had yet, hopefully not too many of my rare steels. I'm going to see if I can salvage them.
     
  17. Willie71

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

    Feb 23, 2013
    Interesting that Elmax is less tough than Vanax and S35VN. 10V is as tough as cast cru-wear. I think I have to try a kitchen knife in 10v. I love my cru-wear kitchen knife. Callie is pretty tough too.

    Note to everyone: I haven’t spent too much time on samples recently. We are still waiting for grinding on many samples, so I haven’t prioritized samples lately.

    I’m saving up for a surface grinder.
     
    Last edited: Oct 1, 2019
  18. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    I agree surface grinding volunteers are still a bottleneck. I got my surface grinding attachment but it takes me about 3 hours to do 16-20 specimens. So I'm going to use it primarily for small batches that I want a quick turnaround time on.
     
  19. Willie71

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

    Feb 23, 2013
    I’m looking at the OBM surface grinder, but have had a lot of extra expenses lately. I’d like a stand alone grinder, but that isn’t in the budget right now.

    https://originblademaker.com/product/belt-grinder-2x72-attachment/
     
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  20. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    I have the OBM surface grinder. It is not perfect but can do the job if you are careful.
     
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