GB/T 21933.2-2008 PDF English
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Ferronickel -- Determination of silicon content -- Gravimetric method
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GB/T 21933.2-2008: PDF in English (GBT 21933.2-2008) GB/T 21933.2-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.100
H 11
Ferronickel - Determination of silicon content -
Gravimetric method
(ISO 8343:1985, MOD)
ISSUED ON: MAY 30, 2008
IMPLEMENTED ON: DECEMBER 01, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Principle ... 4
4 Reagents and materials ... 5
5 Apparatus ... 5
6 Sampling and preparation of samples ... 5
7 Analytical procedure ... 6
8 Expression of results ... 7
9 Test report ... 8
Foreword
This Part of GB/T 21933 modifies and adopts ISO 8343:1985 "Ferronickel -
Determination of silicon content - Gravimetric method".
Compared with ISO 8343:1985, the main technical differences in this Part are
as follows:
a) Delete 7.1.3;
b) CHANGE "silicon content is 0.25%~1%..." in 7.1.2 to "silicon content is
0.20%~1%...";
c) CHANGE "to the nearest 0.001 g" in 7.1.1 and "to the nearest 0.002 g" in
7.1.2 TO "to the nearest 0.0001 g";
d) CORRECT the conversion factor "0.467" in the 8.1 calculation formula to
"0.4674";
e) Adopt national standards as normative references.
This Part was proposed by China Iron and Steel Association.
This Part shall be under the jurisdiction of China Metallurgical Information and
Standardization Institute.
Drafting organization of this Part: Shanxi Taigang Stainless Steel Co., Ltd.
Main drafters of this Part: Dai Xueqian, Zhao Yongxian, Liu Aikun.
Ferronickel - Determination of silicon content -
Gravimetric method
WARNING: The personnel using this Part shall have practical experience
in regular laboratory work. This Part does not point out all possible safety
problems. It is the responsibility of the user to take appropriate safety and
health measures and to ensure compliance with the conditions stipulated
by relevant national regulations.
1 Scope
This Part of GB/T 21933 specifies the gravimetric method for the determination
of silicon content in ferronickel.
This Part applies to the determination of silicon content in ferronickel. The
determination range (mass fraction): 0.2%~4.0%.
2 Normative references
The following documents contain provisions which, through reference in this
Part of GB/T 21933, constitute provisions of this Part. For the dated references,
their subsequent amendments (excluding corrections) or revisions do not apply
to this Part. However, the parties who enter into agreement based on this Part
are encouraged to investigate whether the latest editions of these documents
are applicable. For undated reference documents, the latest editions apply to
this Part.
GB/T 6379.1 Accuracy (trueness and precision) of measurement methods
and results - Part 1: General principles and definitions (GB/T 6379.1-2004,
ISO 5725-1:1994, IDT)
GB/T 6379.2 Accuracy (trueness and precision) of measurement methods
and results - Part 2: Basic method for the determination of repeatability and
reproducibility of a standard measurement method (GB/T 6379.2-2004, ISO
5725-2:1994, IDT)
3 Principle
Dissolution of a test portion in nitric acid. Add perchloric acid to evaporate and
smoke to dehydrate silicic acid to produce insoluble silica. Filter and weigh the
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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