Skip to product information
1 of 4

PayPal, credit cards. Download editable-PDF and invoice in 1 second!

GB/T 223.37-2020 English PDF (GBT223.37-2020)

GB/T 223.37-2020 English PDF (GBT223.37-2020)

Regular price $230.00 USD
Regular price Sale price $230.00 USD
Sale Sold out
Shipping calculated at checkout.
Quotation: In 1-minute, 24-hr self-service. Click here GB/T 223.37-2020 to get it for Purchase Approval, Bank TT...

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

GB/T 223.37-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.080.01
H 11
GB/T 223.37-2020 / ISO 4945:2018
Replacing GB/T 223.37-1989
Iron, steel and alloy - Determination of nitrogen
content - Indophenol blue spectrophotometric method
after distillation separation
(ISO 4945:2018, Steel - Determination of nitrogen -
Spectrophotometric method, IDT)
ISSUED ON: JUNE 02, 2020
IMPLEMENTED ON: DECEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Principle ... 7
5 Reagents ... 7
6 Apparatus ... 9
7 Sampling and sample preparation ... 9
8 Procedure ... 9
9 Calculation of results ... 13
10 Test report ... 15
Annex A (Informative) Examples of distillation apparatus ... 16
Annex B (Informative) Additional information on the international interlaboratory test ... 19
Annex C (Informative) Graphical representation of precision data ... 21 Bibliography ... 22
Foreword
GB/T 223 "Iron, steel and alloy" is divided into several parts.
This Part is Part 37 of GB/T 223.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 223.37-1989 "Methods for chemical analysis of iron, steel and alloy - The indophenol blue photometric methods for the
determination of nitrogen content after distillation separation". Compared with GB/T 223.37-1989, in addition to editorial changes, the main technical changes are as follows:
- Modify the scope (see Clause 1; Clause 1 of the 1989 edition);
- Modify the mass of test portion (see 8.1; 5.1 of the 1989 edition);
- Modify the sample treatment process (see 8.3.1 and 8.3.2; 5.3.1 of the 1989 edition);
- ADD the distillation process of calibration solutions (see 8.4.1).
This Part, using translation method, is identical to ISO 4945:2018 "Steel - Determination of nitrogen - Spectrophotometric method".
China’s documents which have a consistent correspondence with the
international documents normatively referenced in this Part are as follows:  GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods (ISO 3696:1987, MOD)
 GB/T 12806-2011 Laboratory glassware - One-mark volumetric flasks
(ISO 1042:1998, NEQ)
 GB/T 20066-2006 Steel and iron - Sampling and preparation of samples
for the determination of chemical composition (ISO 14284:1996, IDT)
For ease of use, this Part has made the following editorial change:
- In order to be consistent with the existing series of standards, change the standard name to "Iron, steel and alloy - Determination of nitrogen content - Indophenol blue spectrophotometric method after distillation separation". This Part was proposed by China Iron and Steel Association.
This Part shall be under the jurisdiction of National Technical Committee 183 Iron, steel and alloy - Determination of nitrogen
content - Indophenol blue spectrophotometric method
after distillation separation
1 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 %. 2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.
ISO 648 Laboratory glassware - Single-volume pipettes
ISO 1042 Laboratory glassware - One-mark volumetric flasks
ISO 3696 Water for analytical laboratory use - Specification and test methods ISO 14284 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
3 Terms and definitions
No terms and definitions are listed in this Part.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:

View full details