Nitrogen-Alloyed Knife Steels

another great article!!! some of this stuff gets too technical for me and truthfully seems more like witchcraft than anything else with some old guy and a big iron vat mixing molten steel with a magical rod adding a little of this and a little of that . But what a great educational read and it gives me at the least a basic understanding of the steels I like and use. The testing and experimentation with steels/ingrediants and formulas to come to these current day supersteels must have been long and painstaking with lots of failure and frustration along the way .

thanx again for taking time to put these articles together for us!!
 
Cool stuff as always. As a metal caster, ESR, VAR, etc. have always fascinated me.

Looking forward to the H1 article. :)
 
great article. been waiting for you to chime in on these steels. thank you Sir.
 
Great read.

Your past two articles keep reaffirming my love for 14c28n as an all around edc steel for my purposes. High toughness and corrosion resistance, uniform grain structure, good abrasion resistance, and easy to sharpen.

Really looking forward to your H1 discussion.

Thanks again for your work on these articles.
 
I am at work & don't have time read your article yet. Do talk about nitrogen embrittelment? How it does or doesn't effect the steel?
 
Interesting, I only learned about nitrogen-alloyed steel relatively recently and was wondering how they actually added it to the steel.
 
ponykid said:
...and truthfully seems more like witchcraft than anything else with some old guy and a big iron vat mixing molten steel with a magical rod adding a little of this and a little of that....
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Haha! some eye of newt, toe of frog, hemlock root...
 
LG&M said:
I am at work & don't have time read your article yet. Do talk about nitrogen embrittelment? How it does or doesn't effect the steel?
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No talk about nitrogen embrittlement. Maybe you can give me a reference.
 
LG&M said:
At work we had some hardware that suffered hydrogen embrittelment, trying to understand that I heard of the potential of nitrogen embrittelment.
I don’t know alot but I suspect it might not be as much of a problem in knives with the lower amount involved.
https://link.springer.com/article/10.1007/BF02645939
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I'm familiar with hydrogen embrittlement but not nitrogen embrittlement. The article you linked to is about embrittlement from nitrides in the same way that carbides lead to embrittlement.
 
Bigfattyt said:
No mention of Busse INFI steel in the article.
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1) Last I knew there was still not an "official" composition for INFI.
2) I've gotten in trouble for talking about INFI before.
 
Larrin said:
1) Last I knew there was still not an "official" composition for INFI.
2) I've gotten in trouble for talking about INFI before.
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They are also pretty mum on their heat treat protocols etc .

I seem to remember seeing a post where some one had lab tested the steel, and had a suggested compositional makeup. The steel is a nitrogen infused steel. I do see what you are saying about being a proprietary steel, so it has had at least 1 change and run at different standard hardness (ie INFI is what they say it is).
Its been very tough and stain resistant for me. Also have tried it at the higher hardness, which had an improvement at edge retention.
 
Larrin said:
I'm familiar with hydrogen embrittlement but not nitrogen embrittlement. The article you linked to is about embrittlement from nitrides in the same way that carbides lead to embrittlement.
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So not the same thing?
I guess I don't know the difference. It talks about nitrides from nitrogen .
 
LG&M said:
So not the same thing?
I guess I don't know the difference. It talks about nitrides from nitrogen .
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Nitrides and carbides reduce toughness, and can be called "embrittlement" in some cases such as at grain boundaries, tempered martensite embrittlement, etc. But I'm not aware of anything specific to nitrides that is different than the typical carbides. Hydrogen embrittlement happens by different mechanisms.
 
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