1. SCOPE AND FIELD OF APPLICATION
This EURONORM specifies a method for the spectrophotometric determination of nitrogen
in steels.
The method is primarily intended for the determination of total nitrogen in very low
nitrogen non-alloy steels. It may be used. however, for any low nitrogen ferrous alloy
that is soluble in hydrochloric acid provided that the acid-resistant form of silicon
nitride is not present. This highly resistant nitride has been found only in samples
of silicon steels manufactured without aluminium addition and then only in sheet material.
The method is applicable to nitrogen contents from 0.0005 to 0.005% (m/m).
NOTE — The method has also been successfully applied to a pure iron with a nitrogen content
of 0.0038% (m/m) - see Annex.