GB/T 20123-2006 English PDF (GBT20123-2006)

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GB/T 20123-2006: Steel and iron -- Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20123-2006
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.080.01
H 11
GB/T 20123-2006 / ISO 15350.2000
Steel and iron - Determination of total carbon and
sulfur content - Infrared absorption method after
combustion in an induction furnace (routine method)
(ISO 15350.2000, IDT)
ISSUED ON. MARCH 2, 2006
IMPLEMENTED ON. SEPTEMBER 1, 2006
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Principle... 5 
4 Reagents ... 5 
5 Apparatus ... 6 
6 Test method ... 7 
7 Sampling ... 9 
8 Procedure ... 9 
9 Expression of results ... 16 
10 Test report ... 18 
Annex A (Informative) Examples of diagram for analytical principles ... 20 
Annex B (Informative) Examples calculation of a linearity check ... 24 
Test. Carbon over the mass fraction range 0.005% to 0.12% ... 24 
Annex C (Informative) Additional information on international cooperative tests
... 26 
Annex D (Informative) Graphical representation of precision data ... 30 
Foreword
This Standard identically uses ISO 15350.2000.
For easy use, this Standard made the following editorial modifications.
a) modified “this International Standard” to “this Standard”;
b) used decimal point “.” to replace “,” used as decimal point in ISO
15350.2000;
c) deleted the foreword of ISO 15350.2000;
d) moved the position of Table 6 in ISO 15350.2000 below 9.2.2 in this
Standard.
Annex A, Annex B, Annex C and Annex D of this Standard are informative.
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee
on Steel of Standardization Administration of China.
Main drafting organization of this Standard. Iron and Steel Research Institute
Main drafter of this Standard. Yang Guorong.
Steel and iron - Determination of total carbon and
sulfur content - Infrared absorption method after
combustion in an induction furnace (routine method)
1 Scope
This Standard specifies an infrared absorption method, after combustion in an
induction furnace, for the determination of the total carbon and sulfur content in
steel and iron.
The method is applicable to carbon contents of mass fraction between 0.005%
and 4.3% and to sulfur contents of mass fraction between 0.0005% and 0.33%.
This method is intended to be used in normal production operations and is
intended to meet all generally accepted, good laboratory practices of the type
expected by recognized laboratory accreditation agencies. It uses commercially
available equipment, is calibrated and calibration verified using steel and iron
certified reference materials, and its performance is controlled using normal
statistical process control (SPC) practices.
This method can be used in the single element mode, i.e., determination of
carbon and sulfur independently or in the simultaneous mode, i.e.,
determination of carbon and sulfur concurrently.
2 Normative references
The following normative documents contain provisions which, through
reference in this text, constitute provisions of this Standard. For dated
references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this
Standard are encouraged to investigate the possibility of applying the most
recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies.
ISO 437.1982, Steel and cast iron - Determination of total carbon content -
Combustion gravimetric method.
ISO 4934.1980, Steel and cast iron - Determination of sulfur content -
Gravimetric method.