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4J32 Expansion Alloy Wire Supplier China | Semiconductor Grade
Premium Semiconductor Grade 4J32 Low Expansion Alloy Wire – Super Invar 32-5 China Supplier for Hermetic Sealing & Precision Electronics
- Overview
- Specification
- Features & Applications
- FAQs
- Recommended Products
Product Introduction Overview
Invar 36 (also known as Alloy 36, FeNi36 or 4J36) is a premium nickel-iron controlled expansion alloy wire containing approximately 36% nickel and 64% iron. Renowned for its ultra-low coefficient of thermal expansion (CTE), this precision alloy wire maintains dimensional stability across wide temperature ranges—from cryogenic conditions up to 500°F (260°C).
As a professional Invar 36 precision alloy wire supplier and China factory OEM manufacturer, we produce high-quality invar material wire with tight tolerances, custom diameters, and spooled packaging to meet global export standards. Whether you need bulk wholesale Invar 36 wire for aerospace or electronics, our direct factory pricing and strict quality control ensure reliable performance for all low thermal expansion applications.
Product Features
- Ultra-Low Thermal Expansion Coefficient: Achieves minimum CTE in the -55°C to 95°C range (superior to Invar 36), providing unmatched dimensional stability for temperature-sensitive semiconductor components.
- High-Purity Semiconductor Grade Composition: ~32% Ni, ~5% Co, balance Fe with controlled trace elements (C ≤0.02%), ensuring consistent performance in hermetic sealing and optoelectronic packaging.
- Excellent Machinability & Weldability: Ideal for glass-to-metal and ceramic-to-metal seals; supports precision wire drawing in diameters from 0.1mm to 10mm.
- Cryogenic Stability & Austenite Retention: Maintains properties down to -67°F without martensite transformation, perfect for low-temperature electronics and quantum devices.
- Factory-Direct China Manufacturing: OEM-customized wire with full traceability, ISO-compliant, and competitive pricing from a reliable China expansion alloy wire supplier.
- High Corrosion Resistance & Mechanical Strength: Tensile strength up to 483 MPa (annealed), with excellent electrical resistivity for waveguide tubes and sensor leads.
Product Applications
Our 4J32 Expansion Alloy Wire excels in high-precision industries requiring minimal thermal mismatch:
- Semiconductor Packaging & Optoelectronics: Lead frames, connectors, and vacuum feedthroughs where ultra-low CTE prevents cracking in ICs and laser systems.
- Hermetic Glass-to-Metal Sealing: Reliable sealing for sensors, relays, IR detectors, and military-grade electronic packages.
- Aerospace & Precision Instruments: Waveguide tubes, optical components, and cryogenic instrumentation demanding dimensional stability.
- Low-Temperature Electronics & Quantum Devices: Stable performance in superconducting and vacuum applications from our China supplier.
- Medical & Sensor Technology: Probe components and feedthroughs in temperature-variable environments.
Product FAQ
Q1: What is 4J32 Expansion Alloy Wire and how does it differ from standard Invar?
A: 4J32 (Super Invar 32-5) is a nickel-iron-cobalt low expansion alloy wire with ultra-low CTE in the -60°C to 100°C range, offering better low-temperature stability than 4J36 Invar for semiconductor-grade precision applications.
Q2: Why choose a China supplier for semiconductor grade 4J32 wire?
A: Our China manufacturer provides factory-direct pricing, full customization, strict semiconductor-grade purity control, and fast global shipping while meeting international standards like ASTM F1684 equivalents.
Q3: What are the typical diameters and forms available for 4J32 low expansion alloy wire?
A: We supply round wire from 0.1mm to 10mm, coils or straight lengths, with custom tolerances for hermetic sealing and controlled expansion needs.
Q4: Is 4J32 wire suitable for glass-to-metal sealing in vacuum devices?
A: Yes, its controlled thermal expansion matches borosilicate and low-expansion glasses perfectly, making it ideal for semiconductor packaging, sensors, and aerospace hermetic seals.
Q5: What heat treatment ensures optimal low CTE performance in 4J32 Super Invar wire?
A: Anneal at 1550°F (843°C) followed by stress relief and aging at 200°F (93°C) for minimum thermal expansion and maximum stability in precision applications.
Q6: Do you offer OEM and wholesale for 4J32 expansion alloy wire from China?
A: Absolutely – as a professional China supplier, we support OEM, bulk wholesale, and semiconductor-grade certification with competitive pricing and rapid prototyping.
