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4J44 has a certain linear expansion coefficient from -60℃ to 400℃.
Sealing alloys for hard glasses
Transmitting tube
Oscillation tube
Ignitron
Transistor
Relay shell
| Ni | 34.2~35.2 | Fe | bal. |
Co | 19.5~20.5 |
| 25℃-300℃ | 4.3~5.1 |
25℃-400℃ | 4.6~5.2 |
Tensile Strength | ||||
Soft | 1/4Hard | 1/2Hard | 3/4Hard | Hard |
<570 MPa (82.7 ksi) | 520～630 MPa (75.4~91.4 ksi) | 590～700 MPa (85.6~101.5 ksi) | 600～770 MPa (87.0~111.7 ksi) | >700 MPa (>101.5ksi) |
| Hardness | Thickness | Deep-drawing State | ||
>0.2~2.5mm | ≤165HV | |||
>2.5mm | ≤170HV | |||
Gain Size | Deep-drawing State: ≥Level 7 | |||
| Density | 8.12 g/cm3 (0.293 lb/in3) |
| Resistivity | 55 µΩ•cm |
Thermal conduction | 20 W/K |
Elastic modulus | 132 Gpa |
