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Originally Posted by Maytime
When nitrogen is heated, it combines directly with lithium, magnesium, and calcium, and when mixed with oxygen, it forms nitric acid then nitrogen dioxide. I believe large quantities of nitrogen are used to anneal stainless steel IIRC.
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To the best of my knowledge there is no lithium, magnesium, calcium or oxygen in the melt when making the CPM steel that Nitrogen is used in.