8.36g/Cm3 Kovar Rod Kovar Alloy K Uns K94610 With Good Low Temperature Structure Stability
Kovar Rod Alloy K / K94610 / ASTM F15
Kovar rod is made up of 29% nickel, 17% cobalt, .2% silicon, .3% manganese and 53.5% iron. Kovar is known for its low coefficient of thermal expansion. Kovar end uses are usually glass sealing in the electronics industry.
| Alloy Name | Trade Name | UNS # | British Spec | American Spec | German Spec | French Spec |
| Alloy K | Kovar Nilo K Rodar |
UNS K94610 | ASTM F15 ASTM F26 AMS 7726 AMS 7727 MIL-I-23011C Class 1 |
1.3981 | AFNOR NF A54-30 |
- Description
Kovar Foil SPECIFICATION
ASTM F15 , UNS K94610, Werkstoff Nr 1.3981 , DIN 17745 , MIL-I23011 Class 1, AFNOR NF A54-301, S.E.W 385
Heat Treatment:
For the performance test sample of expansion coefficient and low temperature tissue stability specified in the standard, heat it to 900 ℃± 20 ℃ in hydrogen atmosphere for 1h, then heat it to 1100 ℃± 20 ℃ for 15min, and cool it to below 200 ℃ at the speed of no more than 5 ℃ / min.
Material :
| Russia | USA | England | Japan | Franch | Germany |
| 29HK | kovar | Nilo K | KV-1 | Dilvar P0 | Vacon 12 |
| 29HK-B | Rodar Techallony Glasseal 29-17 |
Teleaseal | KV-2 KV-3 |
Dilver P1 | Silvar |
Content Composition %
| C | P | S | Mn | Si | Cu | Cr | Mo | Ni | Co | Fe |
| Less than | ||||||||||
| 0.03 | 0.02 | 0.02 | 0.5 | 0.3 | 0.2 | 0.2 | 0.2 | 28.5-29.5 | 16.8-17.8 | Rest |
Physical properties
| Density | g/cm3 | 8.25 |
| Curie Point | ℃ | 430 |
| Resistivity | μ· m | 0.48 |
| Tensile strength Mpa | Cold state | |
| Annealing | 520 | |
| Yield strength Mpa | Cold state | |
| Annealing | 330 | |
| Elongation % | Cold state | |
| annealing | 30 |
| Type | Size/mm | Deliver State |
| Bar | 5.0-8.0 | Cold Drawn |
| 8.0-30.0 | Hot rolling | |
| 30.0-180.0 | Hot forging | |
| Plate | 3.5-30.0 | Hot rolling |
| 30.0-40.0 | Hot forging | |
| Strip | 0.2-3.5 | Cold rolling |
| Flat wire | 0.5-5.0 | Hot rolling |
| Round wire | 0.1-5.0 | Cold Drawn |
| Capillary | OD8.0-1.0,ID0.1-8.0 | Cold Drawn |
| Pipe | OD120-8.0, ID8.0-129 | Cold drawn |
The linear expansion coefficient of the kovar alloy is similar to that of borosilicate glass at 20-450 ℃, the Curie point is higher, and the alloy has good low temperature structure stability. The oxide film of the alloy is compact and can be well infiltrated by glass. It does not interact with mercury and is suitable for use in instruments containing mercury discharge. It is the main sealing structure material of electric vacuum device.
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