Kovar Bar is a special alloy bar using the brand Kovar, which has excellent thermal expansion properties and dimensional stability. It plays an important role in fields such as electronic packaging, high-precision instruments and precision machinery. The machinability and weldability of Kovar Bar make it ideal for use in manufacturing processes, capable of meeting the needs of a variety of applications. Whether in packaging materials or precision devices, Kovar Bar provides reliable performance and stable dimensional characteristics.
| Trade Name | UNS No. | Specifications | |
Rod | Strip | Wire | Sheet |
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Item | 1J33 | 3J01 | 3J9 | 4J29 | 4J32 | 4J33 | 4J45 | FeNi50 | Invar36 |
C | ≤0.05 | ≤0.05 | 0.22-0.26 | ≤0.03 | ≤0.05 | ≤0.03 | ≤0.05 | ≤0.05 | ≤0.1 |
Mn | ≤0.05 | ≤1.00 | 1.80-2.20 | ≤0.5 | 0.2-0.6 | ≤0.5 | ≤0.8 | ≤0.8 | ≤0.5 |
Fe | Rest |
P | ≤0.020 | ≤0.020 | ≤0.03 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.006 |
S | ≤0.020 | ≤0.020 | ≤0.020 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.04 |
Si | 0.30-0.6 | ≤0.80 | 1.30-1.70 | ≤0.3 | ≤0.2 | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.35 |
Ni | 32.8-33.8 | 34.5-36.5 | 9.0-10.5 | 28.5-29.5 | 31.5-33 | 28.5-29.5 | 44.5-45.5 | 49.5-50.5 | 35-38 |
Al | 1.0-2.0 | 1.00-1.80 | -- | -- | -- | -- | ≤0.1 | ≤0.1 | -- |
Co | -- | -- | -- | 16.8-17.8 | 3.2-4.2 | 16.8-17.8 | - | - | - |
Ti | - | 2.70-3.20 | - | - | - | - | - | - | - |
Cu | - | -- | -- | -- | ≤0.2 | 0.4-0.8 | ≤0.2 | -- | -- |
Cr | -- | 11.5-13.0 | 19.0-20.5 | ≤0.2 | -- | ≤0.2 | -- | -- | -- |
Mo | -- | -- | 1.60-1.85 | ≤0.2 | -- | ≤0.2 | -- | -- | -- |