test report for high nitrogen steel---HNS Yushu

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Yushu_withwind

Joined
Jun 5, 2012
Messages
26
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!

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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 :D

looks interesting!
 
thegeek574 said:
Am I the only only one who thinks that carbon looks a bit low?
Click to expand...

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?
 
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.
 
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.
 
thegeek574 said:
Am I the only only one who thinks that carbon looks a bit low?
Click to expand...

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.
 
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.
 
Maddogg774 said:
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.
Click to expand...
So, nitrogen is the key ingredient that allows for such high hardness with such low carbon?
Thank you very much.
 
Here is a comparison of 5 nitrogen steels:

Tbl--Elements.gif
Tbl-H1.gif
Tbl-N360.gif
Tbl-N680.gif
Tbl-Vanax.gif
Tbl-Yushu.gif


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.
 
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
 
Troop said:
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.
Click to expand...


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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