How do you add N in steel
How do you add N in steel
(OP)
Dear all,
How do you add Nitrogen in Steel/Stainless steels?
I have found a paper
http://www.springerlink.com/content/mt834u5562168827/
That talks about adding nitrided manganese MnN2
or Caclium Cyanamide A.
What's the effect of the properties? I know this is a vague question so to narrow down, what's the effect on stainless?
I know that in duplex it stabilizes the austenite.
How do you add Nitrogen in Steel/Stainless steels?
I have found a paper
http://www.springerlink.com/content/mt834u5562168827/
That talks about adding nitrided manganese MnN2
or Caclium Cyanamide A.
What's the effect of the properties? I know this is a vague question so to narrow down, what's the effect on stainless?
I know that in duplex it stabilizes the austenite.





RE: How do you add N in steel
Nitrogen is soluble in austenite up to about 0.25% depending on the manganese level. Manganese increases the solubility. It has essentially no solubility in ferrite at room temperature.
In solution in austenite nitrogen does three important things. It stabilizes austenite. It increases resistance to pitting corrosion. It causes significant solid-solution strengthening. All of these effects are well quantified and available in the literature.
Nitrogen can also be added to solid steel by various processes which involve diffusing it in from a nitrogen-rich environment, but this is done only to produce surface layers enriched in nitrogen.
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: How do you add N in steel
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: How do you add N in steel
Please read this book:
http://www.amazon.com/High-Nitrogen-Steels-Manufacture-Applications/dp/3540664114
It may have what your looking for.
MH
RE: How do you add N in steel
Bob
RE: How do you add N in steel
RE: How do you add N in steel
High N SS will be significantly stronger than the non-N version (though it will not have much higher creep strength).
Even when we melted small heats we bubbled N through the molten steel. We controlled N levels by mixing N and Ar.
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Plymouth Tube
RE: How do you add N in steel
Or, is it as simple as induction melt in ambient environment, pour casting, and end up with the exact same N content?
Phrased as a more relevant question: How would you get N out of steel (other than diluting with raw material that did not contain N.)
This is a difficult thing to search for.
RE: How do you add N in steel
Yes you will lose some nitrogen. Nitrogen in solid solution will definitely outgas in a melt. In fact, I've heat treated nitrided surfaces, which resulted in a thin depletion layer near the surface. Nitrogen will also react with oxygen to form NO, which makes it more volatile. The fact is that nitrogen is metastable inside iron.
MH
RE: How do you add N in steel
RE: How do you add N in steel
FeCrN
FeMnN
Si3N4
Both the Cr and Mn methods show good and consistent recovery, Si3N4 is somewhat more variable.