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GB/T 24525-2009 (GB/T24525-2009)

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GB/T 24525-2009: PDF in English (GBT 24525-2009)
GB/T 24525-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.050
Q 52
Method for Determination of
Specific Resistance of Carbon Materials
ISSUED ON. OCTOBER 30, 2009
IMPLEMENTED ON. MAY 1, 2010
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 Principle ... 4 
4 Determination of Test Body in Lab ... 5 
5 On-Site Determination of Graphite Electrode Products ... 7 
6 Allowable Error ... 9 
7 Test Report ... 9 
Foreword
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel.
Drafting organizations of this Standard. Sinosteel Jilin Carbon Co., Ltd., and China
Metallurgical Information and Standardization Research Institute.
Chief drafting staffs of this Standard. Wang Jun, Guo Rongyao, Kang Jian, and Cui
Guowei.
Method for Determination of
Specific Resistance of Carbon Materials
1 Scope
This Standard specifies the principle, apparatus, test procedures and allowable error
for the determination of specific resistance of carbon materials.
This Standard is applicable to the determination of specific resistance of carbon
products and graphite products at room temperature.
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 1427 Sample Method of Carbon Material
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and
Judgement of Limiting Values
3 Principle
The specific resistance represents a property of the material, which is the amount of
resistance when current passing the material. It numerically equals to the resistance
value of the conductor with length (L) of 1m and sectional area (S) of 1m2, which is
expressed by ρ. The following formula can be obtained as per Ohm’s Law and the
characteristics of the conductor.
Where.
ρ – Specific resistance of conductor, in µΩm;
Figure 3 Diagram of Testing System of Specific Resistance Tester
5.3.4 Clamp the test body on the test bench; press the current button, so that current
passes the extrusion axial of test body, then read the specific resistance value.
5.3.5 When measuring the current, the test body temperature may raise; therefore,
the measuring time is required to be as short as possible (not exceed 1 min); current
density is lower than 1 A/cm2; so that the change of specific resistance caused by heat
is no more than ±0.5%.
6 Allowable Error
The allowable error when measuring the specific resistance of carbon materials shall
be 2%.
7 Test Report
The test report shall contain the following contents.
a) Entrusting organization;
b) Specimen number, name and specification;
c) Individual and average value of the test result;
d) Potential contact spacing;
e) Current value at the time of measurement;
f) Testing organization;
g) Auditors;
h) Test date.
......
 
(Above excerpt was released on 2016-10-18, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT24525-2009