GB/T 223.37-2020: Iron, steel and alloy--Determination of nitrogen content--Indophenol blue spectrophotometric method after distillation separation

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Scope

This Part of GB/T 223 specifies an indophenol blue spectrophotometric method
after distillation separation for the determination of nitrogen content in iron, steel
and alloy.
The Part is applicable to the determination of nitrogen mass fraction between
0.0006 % and 0.050 % in low alloy steels and between 0.010 % and 0.050 %
in high alloy steels.
The Part does not apply to the determination of nitrogen content in iron, steel
and alloy containing silicon nitrides or having silicon contents higher than 0.6 %.

Basic Data

Standard ID	GB/T 223.37-2020 (GB/T223.37-2020)
Description (Translated English)	Iron, steel and alloy--Determination of nitrogen content--Indophenol blue spectrophotometric method after distillation separation
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H11
Classification of International Standard	77.080.01
Word Count Estimation	14,135
Date of Issue	2020-06-02
Date of Implementation	2020-12-01
Older Standard (superseded by this standard)	GB/T 223.37-1989
Quoted Standard	ISO 648; ISO 1042; ISO 3696; ISO 14284
Adopted Standard	ISO 4945-2018, IDT
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration
Summary	This standard specifies a spectrophotometric method for the determination of nitrogen content in steel and alloys by distillation and separation of indophenol blue. This standard applies to the determination of nitrogen content in low-alloy steels with a mass fraction of 0.0006% to 0.050% and in high-alloy steels with a mass fraction of 0.010% to 0.050%. This standard does not apply to the determination of nitrogen content in steel and alloys containing silicon nitride or silicon content exceeding 0.6%.