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What are Nitrogen binding elements in steel ?

 
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Natacha_Segeivna
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SEFI Member


Joined: 10 Sep 2017
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PostPosted: Sun Sep 10, 2017 10:07 am    Post subject: What are Nitrogen binding elements in steel ? Reply with quote

Hello to everyone.
I hope you are well.

I am actually working with steel rebar, under standard BS4449:2005. There are chemical specification, mentioning that nitrogen should not have higher levels than 0.014% of mass.

Furthermore, Nitrogen is the only chemical compound on which it is said that : "Higher Nitrogen contents are permissible if sufficient quantities of nitrogen binding elements are present".

The problem is that nothing more is said concerning this last sentence. Despite many search on the internet, i did not find any hint concerning these binding elements, and on what extent they do allow higher nitrogen contents.

Also, when chemical testing is done on the product, i was wondering if it is total Nitrogen content that is being measured, or just free Nitrogen.

I would be grateful if you could help me on these questions, and give me a clearer view concerning the Nitrogen issue in this standard.

Kind regards,
Natacha.
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