4J80
4J80 is a nickel-based non-magnetic fixed expansion porcelain sealing alloy. It is mainly used for vacuum tight welding and edge welding of high alumina ceramic materials. It has a medium linear thermal expansion coefficient at room temperature within the range of 600°C.
Chemical composition
| C % | P % | S % | Mn % | Si % | Mo % | W % | Cu % | N % |
Min. | - | - | - | - | - | 9.5 | 9.5 | 1.5 |
|
Max. | 0.05 | 0.020 | 0.02 | 0.40 | 0.30 | 11.5 | 11.5 | 1.5-2.5 | Bal. |
Mechanical properties
Tensile strength (N/mm2) | 725 | |
Yield strength (N/mm2) | 285 | |
Elastic modulu (N/mm2) | 220500 | |
Elongation (%) | 55 | |
Hardness (HV) | 156 | |
Cupping Value | 12.6 | |
Resistivity (Ω.mm2/m) | 0.88 | |
Density (g/mm2) | 9.67 | |
Thermal conductivity (X102W/(m.K)) | 20℃ | 0.155 |
300℃ | 0.167 | |
600℃ | 0.214 | |
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