4j50 ExpansionPrecision Alloy 50h, N50, Vacovit 500, Feni50 Permalloy Soft Magnetic Alloy Strip / Wire
4j50 (Expansion-alloy) 50h, N50, Vacovit 500, Feni50 permalloy Soft Magnetic Alloy strip / wire
Tk-4J50 (Expansion alloy)
(Common Name: 50H, N50, Vacovit 500, FeNi50)
4J50 alloy is mainly composed of iron, nickel elements. It is characterized with a fixed coefficient of expansion. Increase the thermal expansion coefficient and the Curie point with increase of nickel content.
4J50 alloy is widely used the structure of the sealing material in the electric vacuum industry.
Normal composition%
| Ni | 49.5~50.5 | Fe | Bal. | Co | 1.0 | Si | ≤0.3 |
| Mo | - | Cu | - | Cr | - | Mn | ≤0.8 |
| C | ≤0.05 | P | ≤0.02 | S | ≤0.02 | Al | ≤0.1 |
Typical Physical properties
| Density (g/cm3) | 8.21 |
| Electrical resistivity at 20ºC(Ωmm2/m) | 0.44 |
| Thermal conductivity, λ/ W/(m*ºC) | 16.7 |
| Curie point Tc/ ºC | 500 |
| Elastic Modulus, E/ Gpa | 158 |
Coefficient of expansion
| θ/ºC | α1/10-6ºC-1 | θ/ºC | α1/10-6ºC-1 |
| 20~100 | 9.8 | 20~400 | 9.4 |
| 20~200 | 9.8 | 20~450 | 9.4 |
| 20~300 | 9.5 | 20~500 | 9.7 |
| 20~350 | 9.4 | 20~600 | 10.6 |
Typical Mechanical properties
| Tensile Strength | Elongation |
| Mpa | % |
| 490 | 35 |
| The heat treatment process | |
| Annealing | Heated to 900 ±20ºC in a hydrogen atmosphere |
| Holding time, h | 1 hour |
| cooling | With speed not more than 5 ºC / min. cooling to below 200 ºC |
Style of supply
| Alloys Name | Type | Dimension | ||
| TK-4J50 | Wire | D= 0.02~8mm | ||
| TK-4J50 | Strip | W= 5~250mm | T= 0.1mm | |
| Tk-4J50 | Foil | W= 10~100mm | T= 0.01~0.1 | |
| TK-4J50 | Bar | Dia= 8~100mm | L= 50~1000 | |
Soft magnetic alloy are in weak magnetic field with high permeability and low coercive force of alloys.This kind of alloy are widely used in radio electronics, precision instruments and meters, remote control and automatic control system, the combination is mainly used for energy conversion and information processing, the two aspects of is an important material in the national economy.
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