本文件规定了测定钢中氮的分光光度法。本方法适用于测定低合金钢中0.06%～0.050%和高合金钢中0.01%～0.050%的氮质量分数。该方法不适用于含有氮化硅或硅含量高于0.6%的样品。

This document specifies a spectrophotometric method for the determination of nitrogen in steel. The method is applicable to the determination of nitrogen mass fraction between 0,000 6 % and 0,050 % in low alloy steels and between 0,010 % and 0,050 % in high alloy steels. The method does not apply to samples containing silicon nitrides or having silicon contents higher than 0,6 %.