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1J31 is a kind of nickel-iron soft magnetic alloy with Curie point near to room temperature, which is suitable for making temperature compensation components. Similar alloy's names in different standards:
Beiye designation | China Standard designation | International designation |
1J31 |
Traveling wave tube
Anemometer
Watt-hour meter
C | ≤0.04 | Ni | 31.0 |
Si | ≤0.30 | Mn | ≤0.40 |
Fe | bal. |
DC | AC, 50Hz | |
Thickness | 0.35mm (0.014in) | |
Saturation Induction (at -20℃) | 0.6-0.85T (6000-8500Gs) | |
Saturation Induction (at 20℃) | 0.4-0.65T (4000-6500Gs) | |
Saturation Induction (at 60℃) | 0.15-0.45T (1500-4500Gs) |
* Typical values measured on rings sample after annealed at 900°C in pure & dry Hydrogen and then tempered.
| Density | 8.1 g/cm3 (0.29lb/in3) | ||
In-process annealing: To relieve all strains and restore the alloy to a soft condition suitable for further cold rolling or drawing, forming, bending or similar operations, anneal at 1020~1080℃ for not more than 1 hour and the in-process annealing should be conducted in dissociated ammonia, hydrogen, vacuum or inert gas atmospheres.
Final annealing: For maximum softness and optimum magnetic electrical properties, the cold deformed 1J31 alloy should be annealed in an oxygen-free, dry hydrogen atmosphere with a dew point below -40℃ at 900℃ for 1~2 hours.
Oil, grease, lacquer and all other contaminants must be removed before annealing. The individual parts should be separated by an inert insulating powder such as magnesium and aluminum oxide during hydrogen annealing.
Vacuum heat treatment could be used.
