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4J32 Alloy Tube (Invar 32-5 / Fe-Ni-Co Low Expansion Alloy Tube)Precision Low Thermal Expansion Tubing
| Place of Origin | CHINA |
|---|---|
| Brand Name | HUONA |
| Certification | SGS ISO9001 |
| Model Number | PIPE |
| Minimum Order Quantity | 50kg |
| Price | negotation |
| Packaging Details | Case |
| Delivery Time | 30days |
| Payment Terms | T/T |
| Supply Ability | 10000kg/month |
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xProduct Details
| Material Grade | 4J32 / Invar 32-5 / Fe-Ni-Co Alloy | Material Type | Low Thermal Expansion Alloy |
|---|---|---|---|
| Composition | Fe-Ni-Co (Ni ~32%, Co ~5%) | Key Property | Ultra-Low Thermal Expansion |
| Outer Diameter (OD) | 0.5–60 Mm (custom Available) | Wall Thickness | ≥ 0.5 Mm (custom) |
| Inner Diameter (ID) | Customizable | Surface Finish | Bright / Polished / Clean |
Product Description
Product Overview
4J32 alloy tube (also known as Invar 32-5 or Fe-Ni-Co low expansion alloy) is a precision tubing material characterized by its extremely low thermal expansion coefficient within a wide temperature range.
It provides high dimensional stability, excellent elasticity, and stable mechanical performance, making it widely used in aerospace, instruments, sensors, electronic devices, and precision mechanical assemblies.
The material is ideal when strict dimensional accuracy is required under temperature fluctuations.
Key Features
-
Ultra-Low Thermal Expansion
Stable CTE close to 3.5–4.0 ×10⁻⁶/°C between −60°C to +450°C. -
High Dimensional Stability
Maintains consistent geometry under thermal cycling—ideal for precision parts. -
Excellent Elasticity & Strength
Provides stable modulus and mechanical performance. -
Good Weldability and Processability
Suitable for welding, drawing, machining, and precision forming. -
High Vacuum Compatibility
Low outgassing, suitable for aerospace, optical, and scientific instruments. -
Custom Dimensions Available
OD / ID / wall thickness / length can all be customized.
Technical Specifications
| Item | Value |
|---|---|
| Material | 4J32 Fe-Ni-Co Low Expansion Alloy |
| Equivalent Grade | Invar 32-5 / Kovar-type alloy |
| Ni Content | ~32% |
| Co Content | 4.5–5.5% |
| Outer Diameter (OD) | 0.5–60 mm (custom available) |
| Inner Diameter (ID) | Custom |
| Wall Thickness | ≥ 0.5 mm |
| Length | 10 mm – 6000 mm (cut-to-length available) |
| Density | 8.2 g/cm³ |
| Melting Point | 1420–1450 °C |
| Thermal Expansion (20–200°C) | 3.5–4.0 ×10⁻⁶/°C |
| Elastic Modulus | ~137 GPa |
| Hardness | Annealed / 1/2 Hard / Hard |
| Surface Finish | Bright / Polished / Oxide-free |
| Standard | GB/T 15009 / ASTM F1684 equivalent |
| Processing | Seamless / Welded |
Main Applications
| Industry | Typical Uses |
|---|---|
| Aerospace | Sensor housings, structural supports, precision brackets |
| Optical Instruments | Lens frames, positioning rings, calibration tubes |
| Electronics | Relay components, semiconductor equipment, support tubes |
| Precision Measurement | Standard rods, dimensional stability parts |
| Vacuum & Scientific Equipment | Vacuum chambers, cryogenic components |
| Automotive Sensors | Temperature-stable elements, signal tubes |
Product Attributes
| Attribute | Value |
|---|---|
| Material Grade | 4J32 (Invar 32-5) |
| Composition | Fe-Ni-Co |
| Key Property | Ultra-low thermal expansion |
| Wall Thickness | ≥ 0.5 mm |
| Minimum OD | 0.5 mm (custom) |
| Hardness | Annealed / Semi-hard / Hard |
| Tensile Strength | 500–650 MPa (depending on condition) |
| Yield Strength | 300–400 MPa |
| Surface | Bright / Clean / Polished |
| Form | Straight Tube / Coil / Cut Length |
| Color | Metallic Grey |
| Customization | OD / ID / Wall Thickness / Length / Tolerance |
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