Iron,steel and alloy—Determination of nitrogen content—Indophenol blue spectrophotometric method after distillation separation
全国钢标准化技术委员会(SAC/TC 183)
GB/T 223的本部分规定了用蒸馏分离靛酚蓝分光光度法测定钢铁及合金中氮含量的方法。本部分适用于低合金钢中质量分数在0.000 6%~0.050%范围内和高合金钢中质量分数在0.010%~0.050%范围内氮含量的测定。本部分不适用于含氮化硅或硅含量超过0.6%的钢铁及合金中氮含量的测定。
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