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| Categories | Low Expansion Alloy |
|---|---|
| Brand Name: | HUONA |
| Model Number: | 4J33 |
| Certification: | ISO 9001, SGS, RoHS |
| Place of Origin: | CHINA |
| MOQ: | 5KG |
| Price: | NEGOTIATION |
| Payment Terms: | T/T |
| Supply Ability: | 10000KG/WEEK |
| Delivery Time: | A WEEK |
| Packaging Details: | Wooden case, steel strip bundling |
| Density: | 8.2 g/cm³ |
| Thermal Expansion (20–300°C): | 5.0 ×10⁻⁶/°C |
| Tensile Strength: | ≥ 450 MPa |
| Hardness: | HB 130–160 |
| Tolerance: | As per ASTM / GB standard |
| Packaging: | Wooden case, steel strip bundling |
| Origin: | China (OEM/ODM service available) |
| Company Info. |
| Huona (Shanghai) New Material Co., Ltd. |
| Verified Supplier |
| View Contact Details |
| Product List |
4J33 alloy rod is a Fe-Ni-Co controlled expansion alloy containing about 33% nickel and cobalt. It is specially developed for applications requiring stable thermal expansion to match materials such as ceramics or glass.
This alloy combines good mechanical properties, excellent machinability, and stable expansion behavior, making it widely used in electronic packaging, vacuum devices, and precision instruments.
Fe-Ni-Co controlled expansion alloy
Stable thermal expansion coefficient
Excellent hermetic sealing performance with glass/ceramic
Good processability and weldability
Available in rods, wires, sheets, and customized forms
Electronic packaging and sealing
Glass-to-metal and ceramic-to-metal seals
Precision electronic components
Vacuum tubes and relay parts
Aerospace and instrumentation industry
| Element | Content |
|---|---|
| Fe | Balance |
| Ni | ~33% |
| Co | ~17% |
| Mn, Si, C, etc. | Minor |
| Property | Typical Value |
|---|---|
| Density | ~8.2 g/cm³ |
| Thermal Expansion (20–300°C) | ~5.0 ×10⁻⁶/°C |
| Tensile Strength | ≥ 450 MPa |
| Hardness | ~HB 130–160 |
| Working Temp | -60°C to 400°C |
| Standard | GB/T, ASTM, IEC |
| Item | Range |
|---|---|
| Diameter | 3 mm – 200 mm |
| Length | ≤ 6000 mm |
| Tolerance | As per ASTM / GB standard |
| Surface | Bright / Polished / Black |
| Packaging | Wooden case, steel strip bundling |
| Certification | ISO 9001, SGS, RoHS |
| Origin | China (OEM/ODM service available) |
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