1J22 Soft Magnetic Alloy
1J22 is a soft magnetic alloy made of iron, cobalt, and vanadium, known for its high saturation magnetic induction, which can reach up to 2.4T, the highest among existing soft magnetic materials. The alloy also has a Curie point of up to 980°C and a saturation magnetostriction coefficient ranging from 60 to 100 × 10⁻⁶. However, due to its low electrical resistivity (0.27μΩ·m), it is not suitable for use at high frequencies.
Standard Dimensions of 1J22 Soft Magnetic Alloy in Various Forms
| Form | Diameter (Wire/Bar/Rod) | Thickness (Sheet/Foil) | Width | Length | Additional Notes |
|---|---|---|---|---|---|
| 1J22 Sheet/Strip | – | 0.1 mm – 2.0 mm | 10 mm – 400 mm | In coils or custom lengths | Typically used in transformers and magnetic shielding |
| 1J22 Wire | 0.05 mm – 5.0 mm | – | – | Custom lengths | Suitable for electromagnetic coils and sensors |
| 1J22 Bar/Rod | 5 mm – 100 mm | – | – | 1 m – 6 m | Used in magnetic actuators and precision instruments |
| 1J22 Foil | – | 0.02 mm – 0.1 mm | 10 mm – 300 mm | In rolls | For high-sensitivity magnetic components |
| 1J22 Tube | Outer diameter 10 mm – 50 mm | Wall thickness 0.5 mm – 5 mm | – | Custom lengths | Applied in magnetic circuits and special devices |
Chemical composition of 1J22
| Element | Percentage (%) |
|---|---|
| Iron (Fe) | Balance |
| Cobalt (Co) | 48.0 – 50.0 |
| Vanadium (V) | 1.5 – 2.5 |
| Nickel (Ni) | ≤ 0.3 |
| Manganese (Mn) | ≤ 0.4 |
| Silicon (Si) | ≤ 0.3 |
| Carbon (C) | ≤ 0.03 |
| Phosphorus (P) | ≤ 0.02 |
| Sulfur (S) | ≤ 0.02 |
Corresponding and Similar Grades to 1J22 Soft Magnetic Alloy
| Grade | Country | Notes |
|---|---|---|
| 1J22 | China | Standard Chinese designation for high-saturation magnetic induction alloy |
| Co50V2 | China | Chinese designation emphasizing cobalt and vanadium composition (50% Co, 2% V) |
| 50КФ | Russia | Russian equivalent for high-performance magnetic alloys with similar cobalt-vanadium composition |
| Permendur | UK | British equivalent used for similar magnetic applications |
| Supermendur | USA | American version used for high-saturation magnetic materials |
| HiperCo50 | USA | High cobalt content (50%) alloy commonly used in precision magnetic applications |
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1J22 Heat Treatment and Delivery Condition
For cold-rolled strip samples, the material is heated with the furnace to 850-900°C and held for 3-6 hours. It is then cooled at a rate of 50°C/h to 750°C, followed by a faster cooling rate of 180-240°C/h to 300°C. The annealing medium is hydrogen with a dew point no higher than -40°C.
For forged billet samples, they are heated to 1100°C ± 20°C, held for 3-6 hours, then cooled at a rate of 50-100°C/h to 850°C, held for 3 hours, and then cooled at 30°C/h to 700°C. Finally, they are cooled at 200°C/h to 300°C, also using hydrogen with a dew point no higher than -40°C as the annealing medium.
For materials requiring high magnetic induction, low coercive force, and high rectangular ratio in low magnetic fields, the sample is heated with the furnace to 850°C ± 10°C, held for 4 hours, cooled at a rate of 50°C/h to 750°C, held for 3 hours, and then cooled at 200°C/h to 300°C. A direct current magnetic field of 1240-1600A/m is applied during the holding phase at 750°C. The annealing medium is hydrogen with a dew point no higher than -40°C.
1J22 is available in cold-rolled strip, cold-drawn wire, hot-rolled (forged) flat material, bars, and non-standard forgings. It is melted using vacuum induction furnaces.
1J22 Mechanical Properties at Room and Various Temperatures
- Hardness: In its soft state, 1J22 has a hardness of HRB 90, and in its cold-hardened state, it reaches HRC 35.
- Tensile Strength: In its soft state, the tensile strength (σb) is 490 MPa, while in its cold-hardened state, it reaches 1323 MPa.
- Yield Strength: The non-proportional elongation stress (σP0.2) in its soft state is 343 MPa.
- Elongation: After fracture, the elongation (δ) of the alloy is 1%.
- Elastic Modulus: 1J22 has an elastic modulus (E) of 216 GPa.
1J22 Microstructure
The microstructure of 1J22 is a single-phase solid solution with a body-centered cubic lattice. It undergoes a γ→α phase transformation at around 900-930°C. Below 730°C, the alloy undergoes ordering, forming an FeCo superlattice, with the disordered α phase transitioning to the ordered α’ phase.
1J22 Process Performance and Requirements
- Formability: After rapid quenching around 880°C, 1J22 can be processed into thin strips and fine wires, which can be stamped, wound, or formed into various component shapes.
- Weldability: 1J22 has poor weldability.
- Heat Treatment of Parts: Parts made of 1J22 undergo specific heat treatment processes depending on the application.
- Surface Treatment: Specific surface treatment processes can be applied to 1J22 parts to enhance performance.
- Machinability and Grindability: Hot-rolled (forged), cold-drawn wire, and strip materials of 1J22 can be machined and ground. However, after the final heat treatment involving slow cooling, the plasticity of the alloy is greatly reduced, allowing only minor grinding.
1J22 Applications
1J22 is suitable for use in small, lightweight electrical components in the aerospace and aviation industries, such as microelectronic rotors, electromagnet pole pieces, relays, and transducers.
