4J29 Alloy Is A Low-Expansion Nickel-Iron Alloy, Ideal For Precision Instruments

4J29 Alloy Product Description

Overview: 4J29 Alloy is a high-performance nickel-iron alloy with approximately 29% nickel content. It is engineered to provide excellent dimensional stability and minimal thermal expansion, making it highly suitable for precision and high-tech applications where accuracy is critical.

Composition:

• Nickel (Ni): 29%
• Iron (Fe): Balance
• Trace Elements: May include small amounts of carbon, manganese, and silicon, depending on specific processing requirements.

Key Properties:

• Coefficient of Thermal Expansion (CTE): Approximately 1.8 × 10⁻⁶ /°C (1.8 µm/m/°C), which ensures minimal expansion or contraction with temperature changes, preserving dimensional integrity.
• Density: About 8.0 g/cm³, affecting the alloy's weight and handling characteristics.
• Melting Point: Approximately 1420°C (2588°F), indicating the temperature at which the alloy transitions from solid to liquid.
• Tensile Strength: Around 690 MPa (100 ksi), representing the maximum stress the material can endure while being stretched.
• Yield Strength: Approximately 400 MPa (58 ksi), marking the stress at which plastic deformation begins.
• Elongation: About 30%, indicating the percentage of strain the material can withstand before failing.
• Modulus of Elasticity: Approximately 130 GPa (19 × 10⁶ psi), reflecting the alloy’s rigidity and stiffness.
• Thermal Conductivity: Approximately 11 W/m·K, affecting how the alloy manages and transfers heat.
• Electrical Resistivity: Around 50 µΩ·cm, which measures the resistance to electrical current.
• Magnetic Permeability: Low, which minimizes magnetic interference and is beneficial for applications sensitive to magnetic fields.

Applications: 4J29 Alloy is widely used in high-precision applications, including:

• Precision Instruments: Ideal for devices where accurate measurements are critical, such as scientific instruments and measurement tools.
• Aerospace Components: Suitable for parts in aerospace systems that require stable dimensions under varying temperatures.
• Electronics: Used in electronic devices where minimal thermal expansion is essential for performance and reliability.
• High-Precision Machinery: Applied in manufacturing tools and molds that demand exact dimensional stability.

Processing and Fabrication:

• Machinability: Generally good, allowing for effective machining with standard tools. Care should be taken to achieve desired surface finishes and tolerances.
• Weldability: The alloy can be welded using appropriate techniques and materials, though it requires careful handling to prevent thermal stress and distortion.

Standards and Certifications: 4J29 Alloy is often produced according to industry standards such as ASTM and ISO to ensure consistent quality and performance in various applications.

Handling and Storage:

• Storage: Should be kept in a dry, clean environment to prevent corrosion and contamination.
• Safety Precautions: Standard safety practices should be followed during handling and machining to ensure safe working conditions.

Summary: 4J29 Alloy is a specialized nickel-iron alloy known for its low thermal expansion and high dimensional stability. Its properties make it a preferred material for precision instruments, aerospace components, and high-tech applications requiring exact performance and minimal thermal distortion.