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Tungsten rod
ⅠPhysical and chemical properties
1 Forging tungsten rod
1.1 Purity： W≥99.95%；
1.2 Density：≥19.0g/cm3；
1.3 Linearity：≤1%；
2 Sintering tungsten rod
2.1 Purity：W≥99.95%；
2.2 Density：≥18.3g/cm3；
2.3 Linearity：≤3%
ⅡMeasurements and tolerances
Unit：mm
|
Delivery condition |
Diameter |
Diameter tolerance（%） |
Max length |
|
Forging or sintering |
＜20 |
±0.1 |
2000 |
|
20~30 |
±0.1 |
1200 |
|
|
30~60 |
±0.1 |
1000 |
|
|
60~70 |
±0.2 |
800 |
|
|
70~90 |
±0.2 |
600 |
|
|
＞90 |
Manufacture according to customers’ requirements |
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Ⅲ Manufacture process and Equipment
|
Sintering tungsten rod |
|||
|
Item |
Process |
Equipment |
Quality check point |
|
1 |
Tungsten powder |
|
|
|
2 |
Sieving |
High frequency vibrating sieve |
1 Purity of tungsten powder |
|
3 |
Mixed powder |
V shape mixer |
2 Mixed tungsten powder |
|
4 |
Check |
|
|
|
5 |
Isostatic pressing |
Isostatic pressing machine |
1 Measurements, unit net weight |
|
6 |
Check |
|
2 Surface quality |
|
7 |
IF sintering |
IF induction sintering furnace |
1 Measurement, unit net weight, density |
|
8 |
Alignment |
200T pressing machine |
2 Linearity ,Surface quality |
|
9 |
Check |
|
3 Quality standard：GB/T4187-2006 |
|
10 |
Package |
|
4 Show certificate of quality |
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