4J32 Super Invar Alloy: The Ultimate Guide to Ultra-Low Thermal Expansion Materials (September 2025 Update)
1. Material Overview: Why 4J32 Dominates Precision Engineering 4J32, also known as Super Invar alloy, is a Fe-Ni-Co-based precision material designed for scenarios requiring near-zero dimensional changes under temperature fluctuations-4-6-7. Its core advantage lies in an ultra-low thermal expansion coefficient (α ≤1.0×10⁻⁶/°C at 20–100°C), outperforming conventional Invar 4J36 in critical temperature ranges-4-7. Key Performance Metrics vs. Competing Alloys […]