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Thread: test report for high nitrogen steel---HNS Yushu

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    Red face test report for high nitrogen steel---HNS Yushu


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    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 : Yushu_withwind@hotmail.com

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





















    Last edited by Yushu_withwind; 06-06-2012 at 07:56 AM.

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    but ,how to paste the phots?????




































    Last edited by Yushu_withwind; 06-06-2012 at 08:05 AM.

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    Send me a mail at kicksaddiction@gmail.com and i will show you how to do it.

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    What is the chemistry (composition)?
    - Thank you

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    Quote Originally Posted by JayGoliath View Post
    Send me a mail at kicksaddiction@gmail.com and i will show you how to do it.
    Thank you very much.
    I solve the problem with the aid of a friend

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    Quote Originally Posted by Troop View Post
    What is the chemistry (composition)?
    - Thank you
    C:0.38%
    N:0.40%
    Cr:16.2%
    Mo:1.3%
    Ni:0.54%
    Si:0.64%
    Mn:0.75%

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    Am I the only only one who thinks that carbon looks a bit low?

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    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

    looks interesting!
    Change is the only constant...
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    Quote Originally Posted by thegeek574 View Post
    Am I the only only one who thinks that carbon looks a bit low?
    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?

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    Ok, but I would love to see performance tests.

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    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.

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    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.

  13. #13
    Quote Originally Posted by thegeek574 View Post
    Am I the only only one who thinks that carbon looks a bit low?
    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.

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    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.

  15. #15
    Quote Originally Posted by Maddogg774 View Post
    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.
    So, nitrogen is the key ingredient that allows for such high hardness with such low carbon?
    Thank you very much.

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    Here is a comparison of 5 nitrogen steels:



    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.

  17. #17
    Thanks, Chuck.

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    INFI is relatively low on carbon, too.
    http://zknives.com/knives/steels/infi.shtml

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    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

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    Quote Originally Posted by Troop View Post
    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.

    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.

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