GB/T 351-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 351-2019 | English | 125 |
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Metallic Materials - Resistivity Measurement Method
| Valid |
| GB/T 351-1995 | English | 239 |
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Metallic materials. Resistivity measurement method
| Obsolete |
| GB 351-1964 | English | 199 |
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2 days
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Test method for electric resistance coefficient of steel wires
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 351-2019
GB/T 351-2019: Metallic Materials - Resistivity Measurement Method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT351-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.99
H 21
Replacing GB/T 351-1995
Metallic Materials - Resistivity Measurement Method
Issued on. MARCH 25, 2019
Implemented on. FEBRUARY 01, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Test Equipment... 5
5 Sample... 6
6 Test... 6
7 Test Results and Calculation... 10
8 Test Records and Reports... 13
Appendix A (Informative) Schematic Diagram of the Common Conductor
Clamping Tool... 15
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaces GB/T 351-1995 Metallic Materials – Resistivity Measurement
Method. Compared with GB/T 351-1995, this Standard has the major technical content
changes besides the editorial modification.
--- Modify the standard name;
--- Delete the definitions of link resistance and lead resistance;
--- Add the definitions and calculation methods of conductivity, conductivity percent
IACS, and direct-current resistance ratio;
--- Modify the production inspection into routine inspection;
--- Modify the temperature control of the routine inspection from 10°C~35°C into
(20±5) °C;
--- Modify the temperature control of the arbitration inspection from (20±5) °C into
(20±1) °C;
--- Add the length measurement tool Vernier caliper;
--- Add the numerical rounding off on the test results and the calculation;
--- Add the schematic diagram of the common conductor clamping tool (see
Appendix A).
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steels (SAC/TC 183).
Drafting organizations of this Standard. National Quality Supervision and Inspection
Center for Metal Products; Shougang Group; China Metallurgical Construction
Research Institute Ltd.; and China Metallurgical Information and Standardization
Institute.
Chief drafting staffs of this Standard. Wang Jun, Su Jianfeng, Gong Jian, Wang Yujie,
Guo Miao, Yin Yahao, Shi Jianrui, Guo Jifei, Liu Baoshi, and Wang Wenzhong.
The historical edition replaced by this Standard is as follows.
--- GB/T 351-1995.
Metallic Materials - Resistivity Measurement Method
1 Scope
This Standard specifies the terms and definitions, test equipment, sample, test, test
results and calculation, test records and reports for the resistivity measurement of the
metallic materials.
This Standard is applicable to the measurement of the electrical properties such as
volume resistivity, mass resistivity, electrical conductivity and direct-current resistance
ratio, etc.
The method provided in this Standard is an arbitration measurement method and a
conventional measurement method for measuring the resistivity, under the standard
conditions, in a range of 0.01Ω•mm2/m ~ 2.0Ω•mm2/m.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
YB/T 081 Rule for Rounding Off of Numerical Values and Judgement of Testing
Values for Technical Standards of Metallurgy
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Resistance per unit length
It indicates, at the temperature of 20°C, the resistance of a conductor per unit length.
3.2 Volume resistivity
It indicates, at the temperature of 20°C, the resistance of conductor per unit length and
per unit cross-sectional area.
3.6 Direct-current resistance ratio
Under the same twice conditions, for the different positions of the same sample, or
different processes of the same sample on the same position, the ratio of the DC
resistance measurement results.
3.7 Wheatstone bridge
For a single-arm bridge, there are only two contacts during measuring the resistance,
which is called two-contact method. Generally, it is used to measure the higher
resistance.
3.8 Kelvin bridge
For the double-arm bridge, there are four contacts during measuring the resistance,
which is called four-contact method. Generally, it is used to measure the lower
resistance.
4 Test Equipment
4.1 When the sample resistance is less than 10Ω, the Kelvin bridge shall be used;
when the sample resistance is no less than 10Ω, the Wheatstone bridge shall be used.
Other instruments that conform to the provisions of 4.4 can also be used.
4.2 When clamping the sample by the special tool, the blades on the voltage terminals
shall be sharp and parallel to each other, and perpendicular to the same axis. See
Appendix A for a schematic diagram of common conductor clamping tools.
4.5 Thermometer. the indication error shall not exceed 0.1°C.
4.6 Micrometer. the minimum division value shall not exceed 0.01mm.
Vernier caliper. the minimum division value shall not exceed 0.1mm.
5 Sample
5.1 The sample shall be straight. When the sample can’t be straightened by hand,
place it on the surface of a soft material such as wood or rubber, and straightened with
a slight force by a wooden hammer or a rubber hammer.
5.2 The surface of the sample shall be free of visible cracks or defects with a length
greater than 1mm, as well as grease, rust and other contaminants to ensure good
contact.
6 Test
6.1 Temperature control
The routine test shall be performed at (20±5) °C; and the temperature shall remain
stable during the measurement.
6.2 Length measurement
Under the test temperature, measure the sample length L1, and the gauge length L2
between tow voltage terminals.
6.3 Cross-sectional area calculation
6.3.1 Measurement method
6.6 Measurement error
Each measurement error shall conform to the provisions of Table 1.
7 Test Results and Calculation
7.1 General requirements
The standard temperature specified in this Standard is 20°C. When the ambient
temperature deviates from the standard temperature, according to the resistance and
linear size change with the temperature, the resistance value measured at temperature
t shall be converted to the resistance value at the standard temperature of 20°C.
7.2 Calculation of standard temperature resistance
At the standard temperature of 20°C, the resistance on the gauge length of the sample
Parameters Arbitration test Routine test
7.8 Calculation of direct-current resistance ratio
At the standard temperature of 20°C, the direct-current resistance ratio of the sample
shall be calculated as per Formula (11).
7.9 Numerical rounding off
The results of the test measurement shall be rounded off according to the requirements
of relevant product standards. If there are no specific provisions of the product
standards, it shall be rounded off according to the provisions of YB/T 081.
8 Test Records and Reports
8.1 The test records generally include the following contents.
8.2 The test reports generally include the following contents.
Appendix A
(Informative)
Schematic Diagram of the Common Conductor Clamping Tool
A.1 See Figure A.1 for the schematic diagram of clamping tool on the voltage and
current measuring terminals of the sample with circular or square cross-section.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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