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3J9/FeNi50/3J01/1J33/4J29/4J32/4J33/4J45/Invar36
DLX
Bright
ISO9001
5kg
5-20 Days
Industrial Magnet
Nickel Base Alloy
Product Description
4J32 is a classic low-expansion alloy (Super Invar) with a face-centered cubic structure. It offers stable performance validated in aerospace and precision industries. Its composition (approximately 31.5-33% Ni, 3.2-4.2% Co, balance Fe with minor Cu/Mn) delivers a very low linear expansion coefficient, typically α (20–100°C) ≤ 1.0×10⁻⁶/°C, combined with soft magnetic characteristics.
This precision alloy combines an extremely low coefficient of thermal expansion—significantly lower than standard Invar in key temperature ranges—with good magnetic permeability. It is supplied as high-quality wire suitable for manufacturing critical components in high-temp instruments, sensors, and sealing applications.
Available in wire form with customizable diameters, it maintains excellent plasticity, corrosion resistance, and mechanical properties (tensile strength 440-590 MPa in annealed condition). It performs reliably in environments requiring minimal thermal drift and magnetic efficiency.
Ultra-Low Thermal Expansion — Exceptional dimensional stability across temperature changes, with lower expansion than standard Invar in -55°C to 95°C range.
Soft Magnetic Properties — Good magnetic permeability and low coercivity for efficient electromagnetic performance.
High-Temperature Capability — Suitable for high-temp instruments; melting range 1430–1450°C with stable properties.
Excellent Workability — Good plasticity and corrosion resistance in various environments.
Precision Manufacturing — Strict composition control and heat treatment for consistent performance.
High Reliability — Proven long-term stability in aerospace and precision applications.
Specification
| Size Range | |
| Shape | Size |
| Wire | 0.5-7.5 |
| Rod/bar | 8.0-200 |
| Strip | (0.5-2.5)*(5-180) |
| Tube | custom made |
| Plate | custom made |
| 3J9 Soft Magnetic Alloy of chemical composition | |||||||||
| Item | 1J33 | 3J01 | 3J9 | 4J29 | 4J32 | 4J33 | 4J45 | FeNi50 | Invar36 |
| C | ≤0.05 | ≤0.05 | 0.22-0.26 | ≤0.03 | ≤0.05 | ≤0.03 | ≤0.05 | ≤0.05 | ≤0.1 |
| Mn | ≤0.05 | ≤1.00 | 1.80-2.20 | ≤0.5 | 0.2-0.6 | ≤0.5 | ≤0.8 | ≤0.8 | ≤0.5 |
| Fe | Rest | ||||||||
| P | ≤0.020 | ≤0.020 | ≤0.03 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.006 |
| S | ≤0.020 | ≤0.020 | ≤0.020 | ≤0.020 | ≤0.020 | ≤0.020 | ≤0.020 | ≤0.020 | ≤0.04 |
| Si | 0.30-0.6 | ≤0.80 | 1.30-1.70 | ≤0.3 | ≤0.2 | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.35 |
| Ni | 32.8-33.8 | 34.5-36.5 | 9.0-10.5 | 28.5-29.5 | 31.5-33 | 28.5-29.5 | 44.5-45.5 | 49.5-50.5 | 35-38 |
| Al | 1.0-2.0 | 1.00-1.80 | -- | -- | -- | -- | ≤0.1 | ≤0.1 | -- |
| Co | -- | -- | -- | 16.8-17.8 | 3.2-4.2 | 16.8-17.8 | -- | -- | -- |
| Ti | -- | 2.70-3.20 | -- | -- | -- | -- | -- | -- | -- |
| Cu | -- | -- | -- | -- | ≤0.2 | 0.4-0.8 | ≤0.2 | -- | -- |
| Cr | -- | 11.5-13.0 | 19.0-20.5 | ≤0.2 | -- | ≤0.2 | -- | -- | -- |
| Mo | -- | -- | 1.60-1.85 | ≤0.2 | -- | ≤0.2 | -- | -- | -- |
Application Field
High-Temperature Precision Instruments — Sensors, resonators, and metrology equipment requiring minimal thermal drift.
Aerospace & Aviation — Structural components, satellite parts, and instruments needing dimensional stability.
Electronics & Electrical — Glass-to-metal seals, vacuum devices, RF components, and magnetic shielding.
Optical & Laser Systems — Optical benches, laser cavities, and precision frames.
Instrumentation — Thermostats, balance wheels, standard scales, and astronomical instruments.
DLX Advantage
CHANGZHOU DLX ALLOY CO, LTD was established in 2002 and has got ISO9001 International Quality Management System Certificate and SGS Certificate. Our factory is professional in researching and producing special alloy material. From melting, drawing, heat treatment, finishing and testing .We offer nickel-based, copper-based, and iron-based alloys, including super alloy, welding materials, anti-corrosion alloy, precision alloy, FeCrAl alloy, NiCr alloy, CuNi alloy, thermocouple and etc, in the form of wire, strip, ribbon, bar, tube, plate.
1.Market Leader - Top 5 in China's nonferrous metal industry
2.Flexible products - Thousands of product specifications,Meet multiple needs of buyers
3.Low MOQ - Can customize samples
4.Short production lead time，fast delivery of whole cabinet
5.Professional inspection equipment - Before delivery, we will use spectrometers, tensile testers and other professional equipment to conduct a comprehensive inspection of the products to ensure that the goods are qualified for acceptance
6.Professional business team - Quickly responds to customer inquiries,24-hour professional quotation online The salesperson will follow the customer's requirements for the use of the product,Professionally recommend more appropriate performance and price products to customers
7.Intact packaging - Packaging according to customer needs.You can customize wooden boxes to ensure that the goods arrive at the destination in good condition
8.Various payment methods - Facilitate customer payment
9.Get good reviews from customers - Old customers have long-term cooperation,The longest is more than 7 years
10.Received various awards - Google is very recognized by us,They give us awards every year
FAQ
A: 4J32 is commonly known as Super Invar 32-5 or UNS K93500, a low-expansion iron-nickel-cobalt alloy.
A: Its ultra-low thermal expansion coefficient ensures minimal dimensional change even with temperature fluctuations, combined with good high-temperature stability and soft magnetic properties.
A: Yes, it exhibits good magnetic permeability and low magnetic reluctance, making it ideal for electromagnetic applications while maintaining low expansion.
A: Primarily as wire (various diameters), but also strip, rod, and other forms upon request.
A: Optimized for low expansion near room temperature up to moderate-to-high temperatures; exact range depends on specific heat treatment and application. Consult specifications for your use case.
