4J29 pins
4J29 pins refer to pins made of 4J29 alloy. 4J29 pins are used in electronic devices that require precise matching and stable connections, and their specific uses and specifications may vary depending on the application field. Since 4J29 alloy has excellent properties, using 4J29 pins can provide better connection effects and stability.
Iron-nickel-cobalt alloy 4J29 alloy is also called Kovar alloy. 4J29 has a linear expansion coefficient close to that of silicon boron hard glass at 20 ° C to 450 ° C, which can be matched with hard glass to achieve sealing firmly. It has a high Curie point and has good low temperature tissue stability.
4j29 pin material usage:
These parts are mainly used for: electric vacuum, backlight, glass sealed packaging, lithium batteries, medical tools, optical fiber and communication, automotive safety systems, heaters, etc.
Chemical Domposition
| alloy | C | Mn | Si | P | S | Ni | Cr | Co | Cu | Mo | Fe |
| 4J29 | ≤0.03 | ≤0.50 | ≤0.30 | ≤0.020 | ≤0.020 | 28.5~29.5 | ≤0.20 | 16.8~17.8 | ≤0.2 | ≤0.2 | balance |
Tensile Strength, MPa
| Code of condition | Condition | Wire | Strip |
| R | Soft | ≤585 | ≤570 |
| 1/4I | 1/4 Hard | 585~725 | 520~630 |
| 1/2I | 1/2 Hard | 655~795 | 590~700 |
| 3/4I | 3/4 Hard | 725~860 | 600~770 |
| I | Hard | ≥850 | ≥700 |
Typical Physical properties
| Density (g/cm3) | 8.2 |
| Electrical resistivity at 20ºC(OMmm2/m) | 0.48 |
| Temperature factor of resistivity(20ºC~100ºC)X10-5/ºC | 3.7~3.9 |
| Curie point Tc/ ºC | 430 |
| Elastic Modulus, E/ Gpa | 138 |
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