1J50 material properties introduction
1J50 is a nickel-iron soft magnetic alloy with high initial and maximum permeability, low coercivity and high saturation magnetic induction.
Names of similar alloys in different standards:
Kitano grade Chinese standard grade American grade
1J50 Alloy 2
Japan Designation Germany Designation International Designation
PB RNi12, RNi18 E3
Typical applications for this alloy are:
relay
Transformers
filter
choke coil
The heart of the electromagnetic clutch
vibrating membrane
shield
Typical Chemical Composition Weight Percent:
C ≤0.03 Ni 50.0
Silicon 0.20 Manganese 0.40
iron ball.
Typical Magnetic:
DC AC, 50Hz
Saturation induction (80A/m) 1.5T (15 000Gs) -
Coercivity ≤9.60A/m (0.12Oe) -
Initial permeability (0.4A/m) ≥ 3.8mH/m (3 040Gs/Oe)
Maximum permeability ≥62.5mH/m(50 000Gs/Oe)
Typical values measured after ring samples were annealed at 1180°C in pure and dry hydrogen and then tempered.
Typical mechanical properties:
Tensile strength (hard) 900 MPa
Typical values of materials tested according to GB/T 4340.3, GB/T 228, GB/T 22315.
Typical Physical Properties:
Density 8.25 g/cm3
Melting point 1430ºC
Curie temperature 485ºC
Thermal expansion (20~100ºC) 8.4×10-6/ºC
Resistivity 47 Ωcm
Heat treatment:
In-Process Annealing: To remove all strain and restore the alloy to a soft state suitable for further cold rolling or drawing, forming, bending or similar operations, anneal at 1020-1080°C for no more than 1 hour. In-process annealing should be performed in dissociated ammonia, hydrogen, vacuum or inert gas atmosphere.
Final Annealing: For maximum softness and the best magnetoelectric properties, cold deformed 1J50 alloy should be annealed in an oxygen-free, dry hydrogen atmosphere at 1180°C with a dew point below -40°C for 3-5 hours.
Oil, grease, paint and all other contaminants must be removed prior to annealing. During hydrogen annealing, individual parts should be separated by inert insulating powders such as magnesia and alumina.
Vacuum heat treatment can be used, but it usually results in a sacrifice of magnetic properties compared to heat treatment in a dry hydrogen atmosphere.
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