Optimizing Precision with Low Expansion Alloys 4J32 & 4J36: The Ideal Solution for Temperature-Stable Components
In precision engineering applications where dimensional stability is critical, low expansion alloys 4J32 and 4J36 deliver unmatched performance. These specialized alloys maintain consistent dimensions across temperature fluctuations, making them indispensable for high-precision instruments in aerospace, metrology, and optical systems.
Why Choose 4J32 & 4J36 Alloys?
With ultra-low thermal expansion coefficients, these alloys ensure:
Minimal dimensional changes (-60°C to +80°C for 4J36; wider range for 4J32)
Exceptional stability in thermostat rods, laser components, and length standards
Reliable performance in environments with rapid or cyclic temperature variations
Key Composition Advantages
Element | 4J32 | 4J36 | Functional Benefit |
Ni | 31.5-33.0% | 35.0-37.0% | Controls thermal expansion characteristics |
Co | 3.2-4.2% | --- | Enhances 4J32's wider temp stability |
Cu | 0.4-0.8% | --- | Improves machinability in 4J32 |
Note: Both alloys maintain ≤0.05% C and ≤0.02% P/S for consistent material properties
Optimized Applications
Metrology Systems: Length standards requiring micron-level precision
Aerospace Components: Satellite frames and optical mounts
Scientific Instruments: Telescope mirrors and cryogenic devices
Manufacturing Recommendations
Machining: Use carbide tools (slow speeds/high feeds) to prevent work hardening
Heat Treatment: Stress relieve at 600-650°C after cold working
Welding: Employ vacuum electron beam welding to prevent contamination
Selecting the Right Alloy
Choose 4J36 for standard low-expansion applications
Opt for 4J32 when cobalt-enhanced thermal stability is required
These alloys meet China's YB/T 5241-2005 standard, guaranteeing material consistency for critical applications. For engineers designing next-generation precision systems, 4J32 and 4J36 provide the thermal stability foundation for breakthrough performance.