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BEIYE 4J78 Non-Magnetic Controlled Expansion Alloy is specially formulated for applications requiring precise dimensional stability and minimal magnetic interference. With a molybdenum-rich composition and a low magnetic permeability of ≤1.263, 4J78 non magnetic alloy is ideal for non-magnetic sealing parts in electronic devices and vacuum seal welding of high alumina ceramics. Its controlled thermal expansion coefficient of 12.1–13.0 × 10⁻⁶/°C (25°C–600°C) ensures reliable performance in demanding environments.
Non-magnetic sealing parts of electronic device
Vacuum seal welding or edge welding of high alumina ceramic materials
Mo | 20.0～22.0 |
Cu | ≤1.5 |
Fe | bal. |
| 25℃-500℃ | 12.1~12.7 |
| 25℃-600℃ | 12.4~13.0 (α, 10-6℃-1) |
Magnetic permeability μ16000(μH/m) | ≤1.263 |
For detailed pricing and technical specifications on 4J78, please contact Beiye – your trusted partner for high-performance precision alloy and supply.
