GB/T 4181-2017 in English

1. Background and Significance of the Standard

GB/T 4181—2017 Tungsten Wire is a national standard of the People's Republic of China, which is used to regulate tungsten filament products used in electric light sources, electronic devices and other high-temperature environments. This standard replaces the old version GB/T 4181—1997, and the main revisions include brand classification, chemical composition requirements, size specification expansion and performance index optimization.

The formulation of this standard aims to improve product quality, adapt to the needs of industry technology development, and ensure the reliability and safety of tungsten wire in different application fields.

2. Tantalum Wire Brands and Types

3. Dimension and tolerance requirements

The minimum and maximum diameters of tungsten wires vary according to the brand. For example, the maximum diameter of WK80 and WK60 can reach 2000μm, while the minimum diameter of WK40 and W1 is 400μm and ... respectively. Dimensional tolerances are divided into multiple levels (such as level I and level II) to ensure the accuracy and consistency of products in different application scenarios.

4. Chemical composition and performance indicators

Chemical composition requirements:

• Main element tungsten (W) content ≥99.95%
• Impurity elements such as Fe, Al, Mo, etc. are strictly controlled to ensure the purity and high temperature performance of the material.

Tensile strength index:

5. Wire winding performance and high temperature creep test

The wire winding method is suitable for tungsten wires with a diameter range of 8~80μm, and requires no delamination or broken wires under a microscope. The high temperature creep test needs to be carried out at 1600±50℃ to ensure that the residual elongation meets the standard (such as the residual elongation value of WK80 ≤2.0).

6. Implementation suggestions and precautions

1. Strictly purchase and produce raw materials in accordance with the standards to ensure that the chemical composition and size meet the requirements.
2. Establish a complete quality inspection system, especially in terms of tensile strength and wire winding performance.
3. Reasonably select the bobbin and rewinding method to avoid problems such as wire pressing and wire piling.
4. Pay attention to the hot brittleness performance under high temperature environment to ensure the reliability of the product under extreme conditions.