Standard No.:	GB 223.37-1989
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
English Name:	Methods for chemical analysis of iron steel and alloy; The indophenal blue photometric methods for the determination of nitrogen content after distillation separation
Professional Classification:	H11 Steel and iron alloy analysis method
Professional Classification:	GB National Standard
ICS Classification:	77.080
Issued by:
Issued on:	1989-03-31
Implemented on:	1990-07-01
Status:	VALID
Replace By:	GB/T223.37-2020 Iron,steel and alloy—Determination of nitrogen content—Indophenol blue spectrophotometric method after distillation separation
Replace By Date:	2020-12-01
Language:	English
File Format:	PDF
Word Count:	2500 words
Price(USD):	75 (USD)
Delivery:	via email in 1-3 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%.