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GB/T 12940-2023: Technical specification for silver-graphite electrical contacts
Status: Valid GB/T 12940: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 12940-2023 | English | 249 |
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Technical specification for silver-graphite electrical contacts
| Valid |
GB/T 12940-2023
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| GB/T 12940-2008 | English | 439 |
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Technical specification for silver-graphite electrical contacts
| Obsolete |
GB/T 12940-2008
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| GB 12940-1991 | English | 559 |
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Technical specification for silver-graphite electrical contacts
| Obsolete |
GB 12940-1991
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PDF similar to GB/T 12940-2023
Basic data | Standard ID | GB/T 12940-2023 (GB/T12940-2023) | | Description (Translated English) | Technical specification for silver-graphite electrical contacts | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K14 | | Classification of International Standard | 29.120.99 | | Word Count Estimation | 12,113 | | Date of Issue | 2023-11-27 | | Date of Implementation | 2024-06-01 | | Older Standard (superseded by this standard) | GB/T 12940-2008 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 12940-2023: Technical specification for silver-graphite electrical contacts---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 29:120:99
CCSK14
National Standards of People's Republic of China
Replace GB/T 12940-2008
Silver graphite electrical contacts technical conditions
Published on 2023-11-27
2024-06-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Foreword
This document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents"
Drafting:
This document replaces GB/T 12940-2008 "Technical Conditions for Silver Graphite Electrical Contacts": Compared with GB/T 12940-2008, except for structural adjustments
In addition to general and editorial changes, the main technical changes are as follows:
a) The symbols, codes and labeling methods have been changed (see Chapter 4, Chapter 3 of the:2008 edition);
b) The chemical composition and mechanical and physical properties have been changed (see 5:3, 4:3 of the:2008 edition);
c) The standard number of the metallographic structure legend has been changed (see 5:4, 4:4 of the:2008 edition);
d) Changed the technical requirements for soldering silver layer (see 5:5, 4:5 of the:2008 edition);
e) The test method requirements for chemical components have been changed (see 6:3:1, 5:3:1 of the:2008 edition);
f) The test method for resistivity has been changed (see 6:3:2:2, 5:3:2:2 of the:2008 edition);
g) Changed the sampling plan and determination rules for chemical components (see 7:4:3:1, 6:4:3:1:1 of the:2008 edition);
h) Changed the sample size code and normal inspection secondary sampling plan (see 7:5, 6:5 in the:2008 version);
i) Changed transportation requirements (see 8:3, 7:3 of the:2008 edition);
j) The storage requirements have been changed (see 8:4, 7:4 of the:2008 edition):
Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents:
This document is proposed by the China Electrical Equipment Industry Association:
This document is under the jurisdiction of the National Electrical Alloys Standardization Technical Committee (SAC/TC228):
This document was drafted by: Wenzhou Zhongxi Electrical Alloy Co:, Ltd:, Anhui Xinrui New Materials Co:, Ltd:, Hebei University of Technology, Zhejiang Songfa
Composite New Materials Co:, Ltd:, Zhejiang Fuda Alloy Materials Technology Co:, Ltd:, Guilin Jinge Electrical and Electronic Materials Technology Co:, Ltd:, Suzhou City
Silver New Materials Co:, Ltd:, Wenzhou Juxing Technology Co:, Ltd:, Zhejiang Metallurgical Research Institute Co:, Ltd:, Guilin Electrical Science
Research Institute Co:, Ltd:, Wenzhou Hongfeng Electrical Alloy Co:, Ltd:, Shaanxi Rui New Materials Co:, Ltd:, Henan Kefeng New Materials Co:, Ltd:
Co:, Ltd:, Sanyou Lianzhong Group Co:, Ltd:, Wenzhou Yinyu Alloy Co:, Ltd:, China Southern Power Grid Co:, Ltd: Ultra-high voltage transmission
Company, Ningbo Electrical Alloy Materials Co:, Ltd:, Zhengzhou Haonuo Welding Materials Co:, Ltd:, Foshan Nuopu Material Technology Co:, Ltd:, State Grid
Smart Grid Research Institute Co:, Ltd:, Zhejiang Zhixin New Materials Co:, Ltd:, Ruian Yintong Electric Co:, Ltd:, Yueqing Changhong Electrician
Alloy Materials Co:, Ltd:, Metalor Electrical (Suzhou) Co:, Ltd:, Kunming University of Science and Technology:
The main drafters of this document: Feng Ruxin, Zhang Xiaohui, Wang Jingqin, Zhao Chengwei, Bai Xiaoping, Jiang Dezhi, Yang Yucai, Huang Guanglin, Yu Xianwang,
Zhao Haorong, Cui Defeng, Wu Xinhe, Zhang Hang, Zhang Guoshun, Kang Ruxi, Zheng Caiwei, Fang Su, Zhang Shunle, Wang Haibin, Wang Yongye, Ding Yi, Lou Wenlang,
Dai Zhong, Zhou Yong, Yang Hao, Zhou Xiaolong, Jiang Yibin, Yan Lin, Liu Han, Wang Xiaojun, Wei Mingyi:
The previous versions of this document and the documents it replaces are as follows:
---First published as GB 12940-1991 in:1991, first revised in:2008;
---This is the second revision:
Silver graphite electrical contacts technical conditions
1 Scope
This document specifies the technical requirements, inspection rules, marking, packaging and storage of silver graphite electrical contacts, and describes the test methods:
This document applies to the manufacture of silver graphite electrical contacts using sintering-extrusion or sintering-repressing processes:
Note: In the absence of confusion, "silver graphite electrical contacts" in this document are simply referred to as electrical contacts:
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document:
GB/T 2828:1-2012 Enumeration sampling inspection procedures Part 1: Batch-by-batch inspection sampling retrieved by acceptance quality limit (AQL)
plan
GB/T 5163 Density, oil content and porosity of permeable sintered metal materials (excluding cemented carbide)
Determination
GB/T 5586 Test methods for basic properties of electrical contact materials
GB/T 5587 Basic shapes, dimensions, symbols and markings of silver-based electrical contacts
GB/T 26871 Metallographic test methods for electrical contact materials
JB/T 4107:3 Chemical analysis methods for electrical contact materials Part 3: Determination of carbon content in silver graphite
3 Terms and definitions
There are no terms or definitions to be defined in this document:
4 Symbols, codes and marking methods
Silver graphite electrical contacts are coded using a combined coding method: Silver is represented by the two English letters Ag: Graphite uses the English letter C
express: The mass fraction of the graphite component is represented by an Arabic numeral: Graphite orientation is represented by two English letters, Pw means no orientation, Qc
is the vertical orientation, and Qp is the parallel orientation: If necessary, the soldering silver layer is represented by an English letter, H means with soldering silver layer, N means without soldering:
Connect the silver layer: If necessary, the hardness state of the material is represented by an English letter, R is the soft state and Y is the hard state: The coding structure diagram is shown in Figure 1:
Ag C (△) △/△ △
Hardness state of material (R, Y)
Solder silver layer (H, N)
Graphite orientation (Pw, Qc, Qp)
Mass fraction of graphite component (numeric code)
Graphite (letter code)
Silver (letter code)
Figure 1 Coding structure diagram of silver graphite electrical contacts
Example: AgC(3)Qc/HR represents a vertically oriented silver-graphite electrical contact containing 3% graphite with a welded silver layer in a soft state:
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