Density and thermal physical properties of 4J50 iron-nickel precision alloy
The density of 4J50 iron-nickel precision alloy is 8.2 g/cm³, which makes it have moderate quality characteristics and is suitable for electronic and aviation fields that require precision design. The alloy exhibits very stable physical properties at room temperature, especially its thermal expansion coefficient. The average thermal expansion coefficient of 4J50 is about 5.3×10⁻⁶/°C in the range of 20°C to 400°C, which makes it widely used in high-precision and temperature-sensitive equipment, ensuring the dimensional stability of the equipment in thermal environments.
For example, in satellite navigation systems or precision optical instruments, the thermal expansion coefficient of the material is crucial to the positioning accuracy of the product. In such application scenarios, 4J50 iron-nickel precision alloy can effectively avoid errors caused by temperature changes and ensure the long-term accuracy and stability of the equipment.
2. Thermal conductivity and electrical conductivity
The thermal conductivity of 4J50 iron-nickel precision alloy is moderate, with a thermal conductivity of about 17 W/(m·K), which has reasonable thermal conductivity compared with other low expansion alloys. This feature performs well in electronic devices that require rapid heat dissipation, such as some high-precision sensors and microelectronic devices. The thermal conductivity of 4J50 helps to maintain the temperature balance of the device during operation and prevent local overheating from damaging the device.
The resistivity of 4J50 is 0.48 μΩ·m, which is a low-conductivity material. This property makes it often used in environments where electromagnetic interference needs to be prevented. For example, in some high-precision electronic packaging or connectors, the low conductivity of 4J50 can effectively reduce the interference of electromagnetic noise on the equipment and improve the anti-interference ability of the system.
3. Magnetic properties
As an iron-nickel alloy, 4J50 has significant magnetic properties. Its Curie temperature at room temperature is about 500°C, which means that above this temperature, the material loses its magnetism. Due to its high magnetic permeability and low coercivity, 4J50 has been widely used in magnetic shielding and high-precision instruments. For example, 4J50 is often used to manufacture precision magnetic shielding covers. In environments where external magnetic field interference needs to be isolated, it can effectively maintain the normal operation of the equipment and ensure the reliability of precision instruments.
4. Mechanical properties
The mechanical properties of 4J50 iron-nickel precision alloy are also one of its important physical characteristics. Its tensile strength is 500-700 MPa, its elongation is about 20-30%, and it has good plasticity and toughness. This enables 4J50 to maintain high structural strength and good machinability during machining. In high-precision manufacturing, this mechanical property of 4J50 ensures that the material will not affect the quality of the finished product due to deformation or cracking during machining. For example, in structures such as precision connectors and thin-walled tubes, the mechanical advantages of 4J50 alloy greatly improve the service life and stability of the finished product.
