Tungsten wires and rods
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Outline
We have three basic materials for tungsten wires and rods, namely 1) doped tungsten, 2) thoriated tungsten and 3) rhenium tungsten. They have further variations to meet customers' diversified requirements. |
Advantages
1)Doped tungsten
- W31 material is standard doped tungsten with excellent non-sagging properties.
- W41 material excels in secondary processing ability because it has a lower re-crystallization temperature compared to W31 material.
- W71 material is doped tungsten with cobalt and has non-sagging properties and improved vibration resistance.
- W91 material was developed to hold non-sagging properties at high temperature.
2)Thoriated tungsten (Thori-tung)
- W51 material is 0.7% thoria including tungsten. It has higher high-temperature strength owing to thoria dispersion and has improved vibration resistance owing to cobalt addition. It is best suited for lamp filaments that excel in non-sagging properties and vibration resistance at elevated temperatures.
- W53 material is 1.0% thoria containing standard thori-tung for electron tubes.
- W54 material is 1.7% thoria containing standard thori-tung for electron tubes.
- W56 material is 2.0% thoria containing thori-tung for discharge electrodes.
3)Rhenium-tungsten (Rheni-tung)
- H30 is 3% rhenium alloyed tungsten wire material that has higher strength in a wide range from room temperature to high temperature and also has higher elongation after re-crystallization.
- H35 is 15% rhenium alloyed tungsten wire material that has higher electric resistance and mechanical strength.
- H36 is 26% rhenium alloyed tungsten wire material that has higher electric resistance and mechanical strength.
- H37 is 3% rhenium alloyed tungsten that is developed for probe pins.
- H38 is 5% rhenium alloyed tungsten material for the positive wires of thermocouples. It has greater thermo-electromotive force, better linearity and a wider measuring range, namely 2300°C, compared to platinum thermocouples.
- H39 is 26% rhenium alloyed tungsten material for the negative wires of thermocouples and used in combination with H38 wires.
FAQ
FAQ on tungsten and molybdenum
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