How to choose 1j22 VS 1j50 soft magnetic alloy?

2025-10-11

The difference between 1j22 and 1j50 soft magnetic alloys

1J22 and 1J50 are two widely used soft magnetic alloys. They have obvious differences in core properties and application areas. To help you quickly understand, I have summarized their main differences in a table:
Precision alloys specifically refer to alloys that possess specialized physical properties (such as magnetic, thermal, electrical, and elastic) rather than purely mechanical properties.

Comparison Dimension	1J22 (Iron-Cobalt-Vanadium Alloy)	1J50 (iron-nickel alloy)
Alloy Type	High saturation magnetic induction soft magnetic alloy	Fe-Ni soft magnetic alloy (Permalloy)
Core Features	High saturation magnetic flux density (2.4T), high Curie point (980°C), and large magnetostriction coefficient	High magnetic permeability, high magnetic flux density at moderate magnetic fields, low coercivity, and low losses
Key Magnetic Properties	Saturation Magnetic Induction (Bs): ≈2.4 T Curie Temperature (Tc): ≈980°C Resistivity: Approximately 0.27 μΩ·m	Saturation Magnetic Induction (Bs): ≈1.5 T Initial Permeability (μi): High (typical value ≥11.5 mH/m)
Typical Applications	Electromagnetic pole heads, magnetostrictive transducers, aerospace micromotors	Transformer cores operating in medium magnetic fields, magnetic shields, and relays
Processability	Poor processability, prone to oxidation, and relatively expensive	High elongation and good processability

If you are interested in the stock and custom products of the two soft magnetic alloys 1j22 VS 1j50, please contact us.

Selection and Application Recommendations

The decision between these two alloys depends primarily on your core requirements:

For "strength" and "high-temperature stability," choose 1J22:

If your design prioritizes high magnetic flux density, high torque output, or magnetic stability in high-temperature environments, 1J22 is more suitable. Examples include:

Electromagnet poles
High-power magnetostrictive transducers
Aerospace applications require compact, high-power motor components.

Note that 1J22 is difficult and expensive to process, and its low resistivity makes it unsuitable for high-frequency use.

Choose 1J50 for "both sensitivity" and "efficiency":

If your design focuses on achieving high magnetic flux density, high permeability, and low energy loss in moderate magnetic fields, 1J50 is a more universal and economical choice. Typical applications include:

Various transformer cores
Magnetic shielding materials
Relay cores
Computer device components.

It also offers improved processing performance.

Processing Tips and Specifications

1J22 Processing Warning:

As mentioned above, 1J22 has poor processability and is susceptible to oxidation. Its heat treatment process is complex, typically requiring multiple annealing stages under hydrogen protection.
1J50 Processability:

1J50 offers excellent processability. It is available in a variety of hardnesses, including soft, full hard, and medium hard.

The following are the specifications and sizes of soft magnetic alloys available from the Lork Group:

1J22:

Common cold-rolled strip thicknesses range from 0.05mm to 1.00mm, and hot-rolled (forged) flats and bars range in thickness or diameter from 6.0mm to 100.0mm.
1J50:

Strip thicknesses range from an extremely thin 0.001mm to 4mm, with widths up to 1550mm.