ASTM F15 Kovar Alloy Strip Rod Pipe Stable Expansion Coefficient
ASTM F15 Kovar Alloy Strip Rod Pipe Stable expansion coefficient and excellent processing performance
Product Description and Application
Kovar is also known as Nilo k,Dilver,Pernifer 2918,W.N 1.3981,UNS K94610,FeNi29Co17,29HK (Russian),ASTM F15, 4J29 (China)
Kovar has linear expansion coefficient near borosilicate glass at 20 ~ 450℃ with high Curie point and excellent stability of low temperature arrangement. The oxide film of the alloy is fine and can be well moistened by glass. And not react effectively with mercurynot, which is suitable for use in mercury discharge surface. It is the primary sealing structure data of electric vacuum device. It is used to make Fe-Ni-Co alloy strip, rod, plate and pipe with hard glass or ceramic matching sealing. It is mainly used in vacuum electronics, power electronics and other professional devices.
Process Performance and Requirements
- Product Fusion Process
Vacuum Induction Furnace(VIM) and Electroslag Remelting Furnace(ESR)
- Product Chemical Composition
| Alloy Grade |
Chemical Composition(Mass Fraction)%
|
||||||||||
| C | P | S | Mn | Si | Cu | Cr | Mo | Ni |
Co |
Fe |
|
| Not more than | |||||||||||
| Kovar Alloy | 0.03 | 0.020 | 0.020 | 0.50 | 0.30 | 0.20 | 0.20 | 0.20 | 28.5~29.5 | 16.8~17.8 | Rem |
- Product Average Coefficient of Linear Expansion
| Alloy Grade |
Sample Heat Treatment Institution |
Average Coefficient of Linear Expansion,1/℃ | |
| 20℃~400℃ | 20℃~450℃ | ||
| Kovar Alloy | It is heated to 900 ° C±20 ° C in vacuum or hydrogen gas atmosphere, kept for 1 hour, then heated to 1100° C±20 ° C, kept for 15 minutes and cooled to less than 200 ° C at a speed of no more than 5 ° C/min | 4.6 ~ 5.2 | 5.1 ~ 5.5 |
- Product Mechanical Property
| Shape | Tensile Strength,MPa | ||||
| Soft State(S) | 1/4 Hard State(H1/4) | 1/2 Hard State(H1/2) | 3/4 Hard State(H3/4) | Hard State(H) | |
| Wire | ≤ 585 | 585 ~ 725 | 655 ~ 795 | 725 ~ 860 | ≥ 860 |
| Strip | ≤ 570 | 520 ~ 630 | 590 ~ 700 | 600 ~ 770 | ≥ 700 |
- Product Delivery State
| Alloy Grade | Delivery State | |||||
| Soft State(S) | 1/4 Hard State(H1/4) | 1/2 Hard State(H1/2) | 3/4 Hard State(H3/4) | Hard State(H) | Drawing Quality(DQ) | |
| Kovar Alloy | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
- Kovar Alloy product image display
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Kovar Alloy Professional Customization
| Cold-drawn Wire | ¢0.3~¢18mm(Delivery in rolls or trays) |
| Hot-Rolling Wire | ¢5.5~¢20mm(Delivery in rolls) |
| Strip | thickness 0.1~4.5*width 6~350mm(Supply in rolls or straight strips) |
| Smooth Forged Rod on a Lathe |
¢60~350mm,L800-2500mm |
| Hot-rolled Burnishing | ¢20~80mm,L1000-5000mm |
| Cold Drawn and Burnishing | ¢2.5~18mm,L1000-8000mm |
| Seamless Tube | ¢1~275mm,wall thickness 0.2~30,L1000-8000mm |
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