Standard No.:	GB 223.37-1989
English Name:	Methods for Chemical Analysis of Iron, Steel and Alloy - the Indophenol Blue Photometric Method for the Determination of Nitrogen Content after Distillation Separation
Chinese Name:	钢铁及合金化学分析方法 蒸馏分离-靛酚蓝光度法测定氮量
Chinese Classification:	H11    Steel and iron alloy analysis method
Professional Classification:	GB    National Standard
Issued by:	the Ministry of Metallurgical Industry
Issued on:	1989-02-21
Implemented on:	1990-7-1
Status:	superseded
Superseded by:	GB/T 223.37-2020 Iron, steel and alloy—Determination of nitrogen content—Indophenol blue spectrophotometric method after distillation separation
Superseded on:	2021-1-1
Superseding:	GB 223.37-1985
Language:	English
File Format:	PDF
Word Count:	3000 words
Price(USD):	60.00
Delivery:	via email in 1 business day

This standard specifies the indophenol blue photometric method for the determination of nitrogen content after distillation separation.

This standard is applicable to the determination of nitrogen content in pure iron, carbon steel, alloy steel, high temperature alloy and precious alloy and is not applicable the determination of nitrogen content in silicon steel remolded without aluminum and its sectional materials. Determination range: 0.0010%~0.050%.

1 Subject and Aspects Covered 1
2 Method Summaries 1
3 Reagents 1
4 Instruments 2
5 Analysis Procedures 3
6 Calculation (Expression) of Analytic Result 5
7 Precision 5
Appendix A Source Data of Common Precision Test 6