GB/T 5588-2017 in English
VALIDTechnical specification for silver-nickel,silver-iron electrical contacts
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$194.00
《GB/T 5588-2017银镍、银铁电触头技术条件》由TC228（全国电工合金标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
1. Standard Overview
GB/T 5588—2017 Technical Conditions for Silver-Nickel and Silver-Iron Electrical Contacts is a product standard for sheet-shaped silver-nickel and silver-iron electrical contacts produced by powder metallurgy, and is mainly used in low-voltage electrical fields such as contactors, relays and electrical switches.
2. Standard Framework Comparison
| Chapter | 2017 Edition Content | 2002 Edition Differences |
|---|---|---|
| 3.1 Surface Quality | Added specific restrictions on inclusions and burrs. | No clear requirements for inclusion size. |
| 3.4 Metallographic Structure | Added metallographic inspection requirements for extruded electrical contacts. | Does not involve the inspection of extruded products. |
| 5.3 Sampling Rules | Reduces the number of samples and optimizes the inspection process. | Maintains a high sampling ratio. |
3. Interpretation of the core content of the standard
Comparison of chemical composition and mechanical properties
Table 1 lists the chemical composition and mechanical and physical properties of silver-nickel and silver-iron electrical contacts in detail, as shown below:
| Product Name | Representative Symbol | Chemical Composition (mass fraction, %) | Density (g/cm³) | Mechanical and Physical Properties (Hardness HV) | Resistivity (μΩ·cm) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Silver | Nickel | Iron | Soft HB | HV | Hard HB | HV | ||||
| Silver Nickel(5) | AgNi(5) | 95±1 | 5±1 | - | 10.07~10.42 | 40 | 43 | 65 | 68 | 1.95 |
4. Implementation Suggestions
Case Study: Optimization of Chemical Composition Determination Process
In actual production, the determination of silver content is extremely important. According to the method described in Appendix A, the nitric acid decomposition and potassium thiocyanate titration method can be used to accurately measure the silver content. This method is simple to operate and has high accuracy.
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