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Tungsten tube, namely pure tungsten tube, is one of the main pure tungsten products. The purity of tungsten tube produced from medium tungsten can reach more than 99.95%. Because the production process is different, the density will be different. The density can reach 18.2g/cm3 if the product is only sintered and 19.2g/cm3 if it is fully forged. But if the size is large, such as 100mm diameter, even after forging, can not reach 19.2g/cm3, the density can be achieved is about 18.8g/cm3.
Grade | Tungsten content | Content of impurity elements | |
Total content | Each content | ||
W1 | ≥99.95% | ≤0.05% | ≤0.01% |
W2 | ≥99.92% | ≤0.08% | ≤0.01% |
WAL1,WAL2 | ≥99.95% | ≤0.05% | ≤0.01% |
Diameter (mm) | Wall thickness (mm) | Length (mm) |
30-50 | 2–10 | <600 |
50-100 | 3–15 | |
100-150 | 3–15 | |
150-200 | 5–20 | |
200-300 | 8–20 | |
300-400 | 8–30 | |
400-450 | 8–30 | |
450-500 | 8–30 |
Tungsten PIPE is mainly used in thermocouple protection tube in high temperature furnace, sapphire single crystal furnace, high temperature sintering furnace support parts and so on.
Tungsten tube production using powder metallurgy, after the blank, sintering, forging, polishing, inspection packaging can be shipped. China's production standard is GB/T 4187-1984, now generally can reach the American standard ASTM F288-90.
Tungsten tube has quite high purity, generally purity above 99.95%;
Its density is more than 18.2g/cm3;
Recommended operating temperature should be less than 2500℃;
0.2965 for the tungsten tube at 2027℃;
At 1600℃, the coefficient of thermal expansion is 4.98x10-6;
The specific heat capacity at 1400℃ is 0.16J/ g. ℃.
Tungsten tube contamination is low.
