Fax:0086-29-33698670
Email:sales@xagy.cn
Location:No. 88 East of Century Avenue, XianYang, Shaanxi, China. P.C. 712046
Kovar Alloy
Kovar Alloy, is a controlled expansion alloy. It is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron.
Forms: Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube
Description
Kovar Alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties. Extensive quality controls are employed in the manufacture of this alloy to ensure uniform physical and mechanical properties for ease in deep drawing, coining, stamping and machining.
Application
Kovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide use in application where high reliability is a necessity. In power tubes, microwave tubes, transistors, diodes, inter-grated circuits and has been used for the flat pack and the dual-in-line package.
parameter
Cross Reference
| Russia | USA | UK | Japan | France | Germany |
| 29HK | Kovar | Nilo K |
- |
Dilver P0 | Vacon 12 |
| 29HK-ВИ | Rodar Teachallony Glass 29-17 | Teleaseal |
- |
Dilver P1 | Silvar |
Typical chemistry
| C | P | S | Mn | Si | Cu | Cr | Mo | Ni | Co | Fe |
| ≤ | ||||||||||
| 0.03 | 0.020 | 0.020 | 0.50 | 0.30 | 0.20 | 0.20 | 0.20 | 28.5-29.5 | 16.8-17.8 | Balance |
Physical Properties
| Specific gravity | 8.36 | |
| Density | lb/cu in | 0.302 |
| kg/cu m | 8359 | |
| Thermal conductivity | Btu-in/ft²/hr/°F | 120 |
| W/m-K | 17.3 | |
| Curie temperature | °F | 815 |
| °C | 435 | |
| Melting Point | °F | 2640 |
| °C | 1450 | |
| Modulus of elasticity | psi x 10(6) | 20 |
| MPa x 10(3) | 138 | |
| Electrical resistivity | ohm-cir mil/ft | 294 |
| microhm-mm | 490 |
Mechanical Property
| Tensile Strength | Ksi MPa | 75 518 |
| Yield Strength | Ksi MPa | 40 276 |
| Elongation | % in 2 in | 30 |
| Typical Hardness Ann | Rockwell | HRB80 |
| Modulus of Elasticity | Mpsi KMPa | 30 207 |
Average Coefficient of Linear Expansion
| Heat Treatment of the Samples | Average Coefficient of Linear Expansion | ||
| 20～300℃ | 20～400℃ | 20～450°C | |
| Heat to temperature of 900±20℃ in the hydrogen, hold for 1h; re-heat to 1100±20℃, hold for 15 min.; cooled to 200℃ at a rate less than 5℃/min | 4.6 t o 5.2 | 5.1 to 5.5 | |
Mean Coefficient of linear expansion at different temperature, ā/(10-6/K)
Size Range
| Sheet | Thickness:0.10mm~3.50mm, width: ≤300mm |
| Plate | Thickness:3.5mm~40.0mm, width: ≤500mm |
| Round wire | Thickness:0.10mm~5.0mm |
| Flat Wire | Dia 0.5mm~Dia 5.0mm, length≤1000 |
| Rod | Dia 5.0mm~Dia 8.0mm, length≤2000 |
| Dia 8.0mm~Dia 32.0mm, length≤2500 | |
| Dia 32.0mm~Dia180.0mm, length≤1000 | |
| Capillary | OD 8.0mm~1.0mm,ID 0.1~8.0 length≤2500 |
| Pipe | OD 120mm~8.0mm,ID 8.0~129 length≤4000 |
Condition: (With max tolerance) cold rolled, cold drawn, hot rolled , hot forging ,peeled turned ,bright ,bright annealed
XAGY Advantages
1. High-qulity product
- ISO9001:2008 International Quality System Certification.
- With advanced equipments: VIMF, Induction Furnace, ESR Furnace ect.
- Strict Quality-testing System.
2. Strong R & D Strength
- 40,000㎡ production base.
- 60+ R & D team members, with rich customization experience.
- A good assortment of alloy to choose.
3. Efficient delivery
- Flexible transport means, very convenient.
- Tailor a suitable transport plan.
4. Good service
- We provide online service, information feedback within 24 hours.
- Professional team to provide remote technical advice and guidance.
Contact XAGY
Xi'an Gangyan Special Alloy Co., Ltd.
Hotline: 0086-29-33669103
Fax: 0086-29-33698670
Email: sales@xagy.cn
Add.: No. 88 East of Century Avenue, XianYang, Shaanxi, China. P.C.712046
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