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It has excellent characteristics such as high magnetoresistance ratio, low hysteresis, low saturation magnetic induction intensity, and good thermal expansion. Therefore, 4J42 alloy is widely used in the manufacturing of high-precision and high-performance electromagnetic products such as precision instruments, motors, transformers, electronic components, etc.
| Product Average Coefficient of Linear Expansion | ||||
| Alloy Grade | Sample heat treatment institution | Average coefficient of linear expansion α(10-6/ K) | ||
| 20～ 300 ℃ | 20～ 400 ℃ | 20～ 450 ℃ | ||
| 4J42 | It is heated to 900±20 oC in hydrogen atmosphere, insulated lh, and cooled to less than 200 oC at a speed of no more than 5 ℃/min | 4.0～ 5.0 | ------ | 6.5～7.5 |
| Product Typical Expansion Coefficient | |||||||
| Alloy Grade | Average Coefficient of Linear Expansion α(10-6/ K) | ||||||
| 20～100℃ | 20～200℃ | 20～300℃ | 20～400℃ | 20～450℃ | 20～500℃ | 20～600℃ | |
| 4J42 | 5.6 | 4.9 | 4.8 | 5.9 | 6.9 | 7.8 | 9.2 |
| Other Products | ||||||||
| Item | 4J29 | 4J32 | 4J33 | 4J36 | 4J38 | 4J40 | 4J42 | 4J50 |
| C | ≤0.03 | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.05 |
| S | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 |
| P | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 |
| Mn | ≤0.50 | 0.20-0.60 | ≤0.50 | 0.20-0.60 | ≤0.80 | ≤0.25 | ≤0.80 | ≤0.80 |
| Si | ≤0.30 | ≤0.20 | ≤0.30 | ≤0.30 | 35.0-37.0 | ≤0.15 | ≤0.30 | ≤0.30 |
| Ni | 28.5-29.5 | 31.5-33.0 | 32.1-33.6 | 35.0-37.0 | -- | 32.4-33.4 | 41.5-42.5 | 49.5-50.5 |
| Cr | ≤0.20 | -- | -- | -- | -- | -- | -- | -- |
| Co | 16.8-17.8 | 3.2-4.2 | 14.0-15.2 | -- | -- | 7.0-8.0 | ≤0.10 | -- |
| Cu | ≤0.20 | 0.4-0.8 | -- | -- | -- | -- | -- | -- |
| Mo | ≤0.20 | -- | -- | -- | -- | -- | -- | -- |
| Se | -- | -- | -- | -- | 0.10-0.25 | -- | -- | -- |
| Fe | Rest | |||||||
Performance Characteristics
4J42 is a precision alloy with abnormal thermal expansion properties, also known as 4J42 expansion alloy, widely used in the electronic industry, precision measurement tools, precision instruments, deep cooling engineering and other fields. The expansion of metals and alloys after general heating increases linearly with the increase of temperature. However, for some alloys, the bending point temperature of the thermal expansion curve is much lower than the normal thermal expansion coefficient of the bending point. This phenomenon is called abnormal thermal expansion characteristics. 4J42 expansion alloy is divided into low expansion alloy and fixed expansion alloy, the latter is also known as sealing alloy.