Polished tungsten rod, because the surface of the material has been processed, the surface consistency is good, the tolerance is stable, also known as high temperature resistant polished tungsten alloy rod, due to its high melting point, low thermal expansion coefficient, good thermal conductivity, high resistance coefficient, is widely used in various fields. For example: making support wires, lead-in wires, printer needles, various electrodes and quartz furnaces, filaments, high-speed tools, automotive automatic products, sputtering targets, etc. In addition, it is also used in the military field, and the tungsten wire straightened from the tungsten rod is widely used in the lighting industry.
The implementation standard of tungsten rod products is: GB/T 4187-2017, the material and batch number are W1, WAl1, WAl2. The diameter standards of black tungsten rod and polished tungsten rod are: W1 less than 3.0 and greater than or equal to 0.5; WAl1 less than 6.5 and greater than or equal to 3.0; WAl2 less than 20 and greater than or equal to 6.5. The difference is that the diameter tolerance of black tungsten rod is ±1.5%, and the diameter tolerance of polished tungsten rod is ±1.0%.
Tungsten rod optional specifications and sizes:
| Diameter (φ mm) | Max Length (mm) | Diameter Tolerance (mm) | Surface Finish |
|---|
| 0.5 – 1.5 | ≤80 | ≤0.03 | Polished Surface |
| 1.5 – 10 | ≤1000 | ≤0.05 | Polished / Forged |
| 10 – 30 | ≤1500 | ≤0.1 | Polished / Forged |
| ≥30 | ≤1500 | ≤0.1 | Polished / Forged |
Tungsten alloy can be divided into: tungsten copper alloy, tungsten nickel iron alloy, tungsten copper composite material according to different uses. It is a two-phase structure pseudo alloy composed mainly of tungsten and copper elements. It is a metal-based composite material. Due to the large difference in the physical properties of metal copper and tungsten, it cannot be produced by melting and casting. It is generally produced by powder alloy technology. Tungsten copper alloy rod material is mainly used to manufacture arc-resistant high-voltage electrical switch contacts and rocket nozzle throat linings, tail rudders and other high-temperature components. It is also used as electrodes for electrical machining, high-temperature molds, and other occasions that require electrical conductivity and thermal conductivity and high temperature use.
Tungsten alloy classification is as follows:
|
Alloy grade |
specific gravity |
Thermal conductivity |
Coefficient of thermal expansion |
|
WCu7 |
17.5 |
150 |
5.5 |
|
WCu10 |
17.0 |
160 |
6.2 |
|
WCu15 |
16.2 |
170 |
6.9 |
|
WCu20 |
15.4 |
180 |
7.4 |
|
WCu25 |
14.7 |
200 |
8.0 |
|
WCu30 |
14.1 |
220 |
8.8 |
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