GB/T 25051-2010 English PDF (GBT25051-2010)

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GB/T 25051-2010: Ferronickel shot -- Sampling for analysis
GB/T 25051-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.100
H 42
GB/T 25051-2010 / ISO 8049:1988
Ferronickel Shot – Sampling for Analysis
(ISO 8049:1988, IDT)
ISSUED ON: SEPTEMBER 02, 2010
IMPLEMENTED ON: JUNE 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Form and Packaging of Product ... 4
4 Principle ... 5
5 Taking of the Primary Sample and then of the Intermediate Sample ... 5
6 Treatment of the Intermediate Sample and Taking of the Secondary Sample
... 8
7 Remelting of the Secondary Sample ... 8
8 Use of Small Ingots (Secondary Increments) ... 9
Annex A (Informative) Justification of the Number of Primary and Secondary
Increments ... 11
Annex B (Informative) Methods for Taking a Sample of Size N in a Supply of M
Items ... 21
Annex C (Informative) Technical Conditions for Drilling and Milling ... 26
Bibliography ... 36
Foreword
This Standard equivalently adopts ISO 8049:1988 Ferronickel Shot – Sampling for
Analysis (English version).
For ease of use, this Standard has made the following editorial changes:
--- Change "This International Standard" into "This Standard";
--- Use the decimal point “.” to replace the comma “,” that is used as the decimal
point;
--- Delete the Foreword of the international standard;
--- Adopt the national standards for the Normative Reference.
The Annexes A, B and C of this Standard are informative.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee on Pig-
irons and Ferroalloys of Standardization Administration of China.
Drafting organization of this Standard: Shanxi Taigang Stainless Steel Co., Ltd.
Chief drafting staffs of this Standard: Liu Wei, Dai Xueqian, Wang Jun, Liu Aikun, and
Li Lebin.
Ferronickel Shot – Sampling for Analysis
1 Scope
This Standard specifies the sampling of granular ferronickel samples for composition
analysis.
This Standard is applicable to the sampling of granular ferronickel samples for
composition analysis specified in GB/T 25049.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 21933.1 Ferronickel - Determination of Nickel Content - The
Dimethylglyoxime Gravimetric Method (GB/T 21933.1-2008, ISO 6352:1985, IDT)
GB/T 25049 Ferronickel (GB/T 25049-2010, ISO 6501:1988, MOD)
3 Form and Packaging of Product
Grain size: 2mm~50mm;
Lot tonnage: ≥ 5t;
In the case of lots taken form blended stock, the nickel content range k% ~ (k + n) %
of the blended heats shall be chosen as:
15≤k≤59
1≤n≤5
16≤k+n≤601)
1) The case of non-blended lots (case n ≤ 1) is not dealt with this Standard.