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GB/T 3952-2016 English PDF (GBT3952-2016)

GB/T 3952-2016 English PDF (GBT3952-2016)

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GB/T 3952-2016: Copper drawing stock for electrical purpose

This standard specifies the requirements, test methods, inspection rules, marking, packaging, transport, storage, quality certificates, and orders (or contracts) contents of the copper drawing stock for electrical purposes.
GB/T 3952-2016
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 77.150.30
H 62
Replacing GB/T 3952-2008
Copper drawing stock for electrical purpose
ISSUED ON. AUGUST 29, 2016
IMPLEMENTED ON. JULY 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Requirements ... 5
4 Test method ... 11
5 Inspection rules ... 12
6 Marking, packaging, transport, storage and quality certificate ... 14 7 Order (or contract) content ... 15
Appendix A (Informative) Copper drawing stock for electrical purposes - Determination of the amount of copper powder - Dry brushing method ... 16 Appendix B (Informative) Test method for annealing performance of copper drawing stocks ... 18
Appendix C (Informative) Test method for oxide film of copper drawing stock ... 19
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 3952-2008 ?€?Copper drawing stocks for electrical purposes?€?. As compared with GB/T 3952-2008, the main technical changes of this standard are as follows.
- In the normative references, DELETE GB/T 238 ?€?Metallic materials - Wire - Reverse bend test?€?; ADD YS/T 464 ?€?Methods for analytical of copper
cathode - The optical emission spectrometry?€? and GB/T 23606
?€?Copper-hydrogen embrittlement test method?€?.
- MODIFY the content requirements of the impurity element Bi in the
designations T2 and TU2, changing its mass fraction from 0.0006% to
0.0005%.
- MODIFY the requirements of the total amount of impurities in the
designation T3, changing it from 0.05% to 0.06%.
- DEFINE the gauge distance for the elongation test sample at 200mm.
- UNIFY the gauge distance for the sample of copper powder amount and
twist off test into 250mm.
- ADD the surface oxide film indicator requirements of the copper drawing stocks; ADD the oxide film determination method, as shown in Appendix
C.
- CHANGE the sampling amount for the chemical composition, electrical
performance, copper powder amount, and hydrogen embrittlement from
every 15 rolls or 30 t into every 15 rolls or 60 ton.
- MODIFY the hydrogen embrittlement test method of the oxygen-free
copper drawing blanks, changing from the Appendix B hydrogen
embrittlement test method of the oxygen-free copper drawing blanks into GB/T 23606 hydrogen embrittlement test method.
This standard was proposed by China Nonferrous Metals Industry Association. The standard shall be under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC 243).
The responsible drafting organizations of this standard. Jiangxi Copper Co., Ltd., Yunnan Copper Co., Ltd., Jiangsu Jiangrun Copper Co., Ltd., Tongling Nonferrous Metals Group Holdings Tongguan Electric Co., Ltd.
Copper drawing stock for electrical purpose
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transport, storage, quality certificates, and orders (or contracts) contents of the copper drawing stock for electrical purposes. This standard applies to the circular cross-section copper wire stock having a diameter of 6.0 mm ~ 35.0 mm, which is used for further drawing to produce wire materials OR for other copper conductors for electrical purposes.
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 Standard.
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1. Test
methods (scale A, B, C, D, E, F, G, H, K, N, T)
GB/T 3048.2 Test methods for electrical properties of electric cables and wires - Part 2. Test of electrical resistivity of metallic materials
GB/T 4909.2 Test methods for bare wires - Part 2. Measurement of
dimensions
GB/T 4909.3 Test methods for bare wires - Part 3. Tensile test
GB/T 4909.4 Test method for bare wires - Part 4. Torsion test
GB/T 5121 (all parts) Methods for chemical analysis of copper and copper alloys
GB/T 23606 Copper-hydrogen embrittlement test method
YS/T 464 Methods for analytical of copper cathode - The optical emission spectrometry
3 Requirements
3.1 Product classification
3.1.1 Designation, status, specifications
If the user has the annealing performance requirement for the copper drawing stock of T3 designation AND indicated in the contract, it may make the
annealing performance test with reference to the methods in Appendix B, AND indicate the annealing performance of this batch of products in the supply quality certificates. [If the measured Rockwell hardness (grade F) is less than 60 HRF, it will be deemed as full annealing; if it is 60 HRF ~ 70 HRF, it will be deemed as medium annealing; AND if it is greater than 70 HRF, it will be deemed as low annealing].
4 Test method
4.1 Chemical composition
The chemical composition analysis method of copper drawing stocks may
follow the requirements of GB/T 5121 (all parts) or YS/T 464. The arbitration analysis method shall be in accordance with GB/T 5121 (all parts).
4.2 Dimensional measurement
The method of measuring the size of copper drawing stock shall be in
accordance with the provisions of GB/T 4909.2.
4.3 Surface quality
The surface quality of copper drawing stocks is visually inspected AND the surface oxide film test is carried out with reference to Appendix C.
4.4 mechanical properties
The tensile test of copper drawing stock at room temperature shall be carried out in accordance with GB/T 4909.3, AND the sample will use the gauge
distance of 200 mm.
4.5 Torsional performance
The twist off test shall be carried out in accordance with the provisions of GB/T 4909.4. The gauge length of the sample is 250 mm AND the torsional speed is 30 r/min (the speed deviation is within ?? 10%).
4.6 Electrical performance
4.6.1 The test methods for the resistivity of copper drawing stock shall be in accordance with the requirements of GB/T 3048.2.
4.6.2 It shall prepare sample for the resistivity test using the following methods. CLEAN and PROCESS the sample to such an extent as having a diameter of 2 mm; REMOVE oil stain; MAKE it subjected to annealing in the 500 ??C ~ 550 ??C protective atmosphere for 30 min; then in the same protective atmosphere, COOL it down quickly OR quickly TRANSFER it from air into water for cooling purposes.
5.5.1 When the chemical composition and electrical performance are
disqualified, the corresponding batch is deemed as disqualified. When the mechanical properties, torsional performance, surface quality and dimensional deviation are disqualified, the corresponding roll is deemed as disqualified. 5.5.2 When the amount of copper powder, hydrogen embrittlement and
annealing performance are not in accordance with this standard or the order (or contract), a double number of samples shall be taken from this batch of products (including the roll of product which is disqualified in the original inspection) for repeated test. If the repeated test results are all qualified, this batch of products complies with the requirements of the contract; if there is still disqualified sample in the repeated test results, this batch of products is disqualified OR it will be subjected inspection roll by roll, AND only those qualified are batched and supplied.
6 Marking, packaging, transport, storage and quality
certificate
6.1 Marking
The each roll of qualified copper drawing stock shall be attached with the label indicating the following information.
a) Name of the manufacturer;
b) Product trademark;
c) Product designation, status, specifications;
d) Net weight;
e) Lot number;
f) Production date.
6.2 Packaging
6.2.1 Copper drawing stocks shall be wrapped in a roll AND tied well.
6.2.2 It shall have the measures to prevent moisture, contamination, and mechanical damage.
6.2.3 It is allowed for both parties to specify the packaging method through negotiation.
6.3 Transport, storage
In the storage, handling and transport process, it shall pay attention to protect the copper drawing stock from mechanical damage AND to prevent copper
drawing stock from dampen or erosion from corrosive material.
Appendix A
(Informative)
Copper drawing stock for electrical purposes - Determination of the
amount of copper powder - Dry brushing method
A.1 Scope
This Appendix specifies the method for determining the amount of copper powder on the surface of copper drawing stock which is processed by
continuous casting and rolling for electrical purposes.
This appendix is only applicable to the determination of ...

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