1. Welcome to the New & Improved BladeForums. New software info here. Please report problems in Tech Support, and read existing threads before posting! - Spark
  2. I've changed the default forum style to Flat Awesome based on feedback. Don't like it? Click here to change how the forums look Feedback on this is welcome here.

test report for high nitrogen steel---HNS Yushu

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Yushu_withwind, Jun 6, 2012.

  1. Yushu_withwind

    Yushu_withwind

    26
    Jun 5, 2012
    Hi everybody,I'm new here and this is my first post.
    Recently, we successfully trial-produced a high nitrogen steel(HNS) and we named it Yushu.
    Yushu was produced by electroslag remelting under pressure protection of nitrogen and we did some
    tests.....

    Welcome to contact me, and I hope more exchanges,my emailis : [email protected]

    Please look at the phots,thank you for your attention!

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
    Last edited: Jun 6, 2012
  2. Yushu_withwind

    Yushu_withwind

    26
    Jun 5, 2012
    but ,how to paste the phots?????


    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
    Last edited: Jun 6, 2012
  3. Troop

    Troop KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Oct 26, 2006
    What is the chemistry (composition)?
    - Thank you
     
  4. Yushu_withwind

    Yushu_withwind

    26
    Jun 5, 2012
    C:0.38%
    N:0.40%
    Cr:16.2%
    Mo:1.3%
    Ni:0.54%
    Si:0.64%
    Mn:0.75%
     
  5. thegeek574

    thegeek574

    Sep 3, 2010
    Am I the only only one who thinks that carbon looks a bit low?
     
  6. sloth357

    sloth357 Platinum m0f0 Platinum Member

    Jan 5, 2011
    subscribed.. is this actually something that would work for knives.. so its apparently a stainless/corrosive res. steel?

    will there be testing on knives made of this soon? edge retention is KEY :D

    looks interesting!
     
  7. Bo T

    Bo T

    Feb 12, 2011
    It doesn't matter as long as the hardness/toughness is there. Higher carbon tends to equate with higher corrosion.

    Does the N replace the C in the crystal? What is the primary crystalline structure in the tempered steel?
     
  8. thegeek574

    thegeek574

    Sep 3, 2010
    Ok, but I would love to see performance tests.
     
  9. Bo T

    Bo T

    Feb 12, 2011
    How does this steel compare to other air hardening steels (i.e. A2)? One strength this steel has is the quench and heat treat. Also, the chromium nitride that might be formed could help give a very durable edge.
     
  10. stevomiller

    stevomiller

    May 4, 2001
    Guys, this steel is going to be more along the lines of H1 like Spyderco uses. Comparing it to non-stainless tool steel is an apples to oranges at best.
    Yushu, thanks for sharing your progress and all the info.
     
  11. Troop

    Troop KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Oct 26, 2006
    I was thinking the exact same thing. I just don't see how it can get to a possible 60 HRc with such low carbon content. I thought it was a typo.
     
  12. Maddogg774

    Maddogg774

    Sep 19, 2011
    Carbon cage to trap the nitrogen in low temp. Cooling and less carbon is needed and increasses flexibility, toughness and hardness according to the research. Crucibles website has a more in-depth explanation.
     
  13. Troop

    Troop KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Oct 26, 2006
    So, nitrogen is the key ingredient that allows for such high hardness with such low carbon?
    Thank you very much.
     
  14. Alpha Knife Supply

    Alpha Knife Supply Always Innovating Basic Member Dealer / Materials Provider

    Oct 14, 1998
    Here is a comparison of 5 nitrogen steels:

    [​IMG][​IMG][​IMG][​IMG][​IMG][​IMG]

    Yushu is close to Bohler N360.

    The nitrogen steels are making a big impact in the knife community. Spyderco has been using H1 for years. Benchmade uses N680. I like both steels but prefer N680 because I think it holds an edge better.

    We've been using Vanax at HRC 59 for about two years and we are very impressed with the edge holding. It compares with S30V but it is much easier to sharpen.
     
  15. Troop

    Troop KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Oct 26, 2006
    Thanks, Chuck. :thumbup:
     
  16. Maddogg774

    Maddogg774

    Sep 19, 2011
  17. stevomiller

    stevomiller

    May 4, 2001
    Chuck, thanks for throwing up that chart of various nitrogen steels, and for sharing your personal experience. Yushu, in reviewing the spectro-analysis it appears that there is sufficient boron and manganese to be aiding the hardenability of the alloy, even though you do not show it in your final summary. I imagine that removal of these two items will cause your alloy to behave much differently.
    Best,
    Steve
     
  18. Yushu_withwind

    Yushu_withwind

    26
    Jun 5, 2012

    It is not a typo,:)
    Carbon and nitrogen are clearance solution strengthening elements, they has similar strengthening effect.In Yushu, C+N is about 0.78%,so geting highhardness.

    As everyone knows, The nitrogen can improve the anti-corrosion ,but people ignore the nitrogen enhance the toughness of the steel. under the conditiong of high content of carbon, it easy to form large primary eutectic carbide during the solidification ,thess carbide significantly reduce the toughness.Secondly,nitrides is stable and can restrain the growth of carbide.That is, high nitrogen steel possesses good fracture toughness and excellent corrosion.
     

Share This Page