2J11 Permanent Magnetic Alloy Bar
2J11 Permanent Magnetic Alloy Bar is a Fe-Co-V magnetic hysteresis alloy bar designed for excellent hysteresis characteristics in medium and high working magnetic fields. It is widely used for hysteresis motor rotors, precision magnetic components, electromagnetic assemblies, aerospace control parts, sensors and high-efficiency magnetic devices.
SASA ALLOY supplies 2J11 permanent magnetic alloy bars, rods, forged bars and precision magnetic alloy bar stock in customized diameter, length, tolerance and surface finish. MTC (Mill Test Certificate), EN 10204 3.1 certificate, PMI inspection, dimensional inspection, magnetic property testing and third-party inspection can be provided according to project requirements.
Product Parameters
| Item | Details |
|---|---|
| Product Name | 2J11 Permanent Magnetic Alloy Bar / Fe-Co-V Magnetic Hysteresis Alloy Bar |
| Grade | 2J11 |
| Material Type | Fe-Co-V magnetic hysteresis alloy / permanent magnetic precision alloy |
| Shape & Sizes | Round bar, rod, forged bar, machined bar; common diameter 6 mm – 200 mm, customized size available |
| Length | 1000 mm – 6000 mm, cut-to-length available according to customer drawing |
| Surface Finish | Black, bright, peeled, turned, polished, ground |
| Standards | GB/T 14988-2008 or customer technical specification |
| Tolerance | Standard tolerance, h9, h11, k12 or customized tolerance according to drawing |
| Certificate | MTC, EN 10204 3.1 certificate, PMI report, dimensional inspection report, magnetic property test report and third-party inspection available |
Chemical Composition
The following chemical composition is a typical reference range for 2J11 Fe-Co-V magnetic hysteresis alloy. Final chemical values should be confirmed according to the actual Mill Test Certificate.
| Element | Content (%) | Function in Alloy |
|---|---|---|
| Iron (Fe) | Balance | Base element for Fe-Co-V magnetic hysteresis alloy structure |
| Cobalt (Co) | 51.0 – 53.0 | Provides magnetic strength and hysteresis performance |
| Vanadium (V) | 10.5 – 11.5 | Supports magnetic hysteresis characteristics and alloy stability |
| Nickel (Ni) | ≤ 0.70 | Controlled residual element |
| Carbon (C) | ≤ 0.12 | Controlled for magnetic and processing performance |
| Silicon (Si) | ≤ 0.70 | Controlled residual element |
| Manganese (Mn) | ≤ 0.70 | Controlled residual element and processing support |
| Phosphorus (P) | ≤ 0.025 | Controlled impurity |
| Sulfur (S) | ≤ 0.020 | Controlled impurity |
Mechanical Properties
2J11 is mainly selected for magnetic hysteresis performance. Mechanical properties may vary depending on bar diameter, cold working, heat treatment condition and final tempering process.
| Property | Reference Value | Engineering Meaning |
|---|---|---|
| Material Type | Fe-Co-V magnetic hysteresis alloy | Designed for medium and high working magnetic fields |
| Tensile Strength | Condition dependent | Depends on rolling, forging, cold working and heat treatment |
| Hardness | Condition dependent | Can be adjusted by processing and tempering condition |
| Hμ | 15.92 – 20.69 kA/m | Reference magnetic field strength data for 2J11 series material |
| Bμ | 0.9 – 1.2 T | Reference magnetic induction data |
| Pμ | ≥ 35 kJ/m³ | Reference magnetic energy parameter |
| Kμ | ≥ 0.57 | Reference magnetic characteristic parameter |
| Dimensional Stability | Heat treatment dependent | Important for precision motor rotor and magnetic assemblies |
Common Size Table
| Diameter | Typical Length | Surface Finish | Common Use |
|---|---|---|---|
| 6 – 12 mm | 1000 – 3000 mm | Bright, polished, ground | Small magnetic pins, sensor parts, precision magnetic components |
| 14 – 30 mm | 2000 – 6000 mm | Peeled, turned, bright | Small rotor shafts, magnetic parts and machined components |
| 32 – 60 mm | 3000 – 6000 mm | Black, peeled, rough turned | Hysteresis motor rotors and electromagnetic assemblies |
| 65 – 120 mm | Cut-to-length | Forged, rough turned, machined | Large magnetic rotors and project-specific components |
| Above 120 mm | Customized | Forged, rough machined | Special industrial magnetic assemblies and custom parts |
Different Specifications Comparison
| Product Form | Main Feature | Recommended Application | Selection Advice |
|---|---|---|---|
| 2J11 Round Bar | Good balance of magnetic hysteresis performance and machinability | Hysteresis motor rotors, magnetic shafts, precision components | Recommended for standard bar machining |
| 2J11 Forged Bar | Suitable for large sections and heavy magnetic components | Large motor rotors, special electromagnetic assemblies | Recommended for large size and custom parts |
| 2J11 Bright Bar | Better surface finish and dimensional control | Precision magnetic components, instrument parts, sensors | Recommended when tight tolerance and surface quality are important |
| 2J11 Ground Bar | Smooth surface and improved size accuracy | CNC parts, precision rotors and shaft components | Recommended for final machining allowance control |
| 2J11 Strip / Sheet | Suitable for magnetic parts requiring thin sections | Hysteresis motor components and special magnetic parts | Recommended when plate or strip geometry is required |
Equivalent Standards and International Names
| Standard / Name | Designation | Remarks |
|---|---|---|
| Chinese Grade | 2J11 | Permanent magnetic alloy / magnetic hysteresis alloy |
| Chemical Type | Fe-Co-V alloy | Iron-cobalt-vanadium magnetic hysteresis alloy |
| Alloy Family | Vicalloy Type Alloy | Fe-Co-V permanent magnetic hysteresis alloy reference |
| Related Grades | 2J04 / 2J07 / 2J09 / 2J10 / 2J12 | Selected according to magnetic field and hysteresis performance requirements |
| Chinese Standard | GB/T 14988-2008 | Reference standard for permanent magnetic alloy forms |
| Available Forms | Rod, bar, wire, forging, plate, sheet, strip | Different product forms for rotor, motor and magnetic part production |
Production Process Flow
| Step | Process | Quality Control Focus |
|---|---|---|
| 1 | Raw Material Selection | Check Fe, Co, V content, raw material source and heat number traceability |
| 2 | Melting / Refining | Control cobalt, vanadium and impurity elements |
| 3 | Ingot / Billet Preparation | Ensure suitable billet quality for rolling, forging or drawing |
| 4 | Hot Rolling / Forging | Control bar size, internal structure and deformation process |
| 5 | Tempering / Magnetic Heat Treatment | Adjust magnetic hysteresis performance according to working magnetic field |
| 6 | Straightening | Control straightness for rotor machining and assembly |
| 7 | Peeling / Turning / Grinding | Improve surface quality and dimensional tolerance |
| 8 | Inspection and Testing | PMI, chemical analysis, dimensional inspection, surface inspection and magnetic test if required |
| 9 | Packaging and Shipment | Protective wrapping, wooden case, label, heat number and shipping mark |
Product Inspection
| Inspection Item | Inspection Method | Purpose |
|---|---|---|
| Chemical Composition | Spectrometer analysis / laboratory test | Confirm 2J11 Fe-Co-V alloy grade and element control |
| PMI Test | Positive Material Identification | Prevent material mix-up and wrong grade shipment |
| Mechanical Test | Tensile strength, hardness or other required test | Verify mechanical performance according to order requirement |
| Magnetic Property Test | Hysteresis loop test, magnetic field strength, magnetic induction or customer-defined test | Verify magnetic hysteresis performance for motor rotor applications |
| Dimension Inspection | Caliper, micrometer, straightness inspection | Confirm diameter, length, tolerance and straightness |
| Surface Inspection | Visual inspection and surface quality check | Check cracks, scratches, oxidation, peeling defects and surface finish |
| Ultrasonic Testing | UT inspection if required | Check internal defects for critical bars and forged sections |
| Certificate | MTC / EN 10204 3.1 / inspection report | Ensure material traceability and project documentation |
Product Packaging
| Packaging Item | Details | Benefit |
|---|---|---|
| Surface Protection | Plastic film, anti-rust paper, oil protection or protective wrapping | Protects bar surface from scratches and oxidation during transportation |
| Bundle Packing | Bars bundled with steel strips or protective belts | Prevents movement, bending and collision |
| Wooden Case / Wooden Pallet | Export-standard wooden case or pallet | Suitable for long-distance sea, air and truck shipment |
| Labeling | Grade, size, heat number, quantity, net weight and customer mark | Improves material traceability after delivery |
| Document Support | Packing list, invoice, MTC, EN 10204 3.1 certificate and inspection report if required | Supports customs clearance and project acceptance |
Applications & Machinability
Applications
| Industry | Typical Parts | Why 2J11 Bar Is Used |
|---|---|---|
| Medical Instruments | Magnetic drive parts, precision magnetic components, instrument rotor parts | Used when stable magnetic hysteresis performance is required in precision equipment |
| Aerospace | Hysteresis motor rotors, control system magnetic parts, actuator components | Suitable for compact magnetic assemblies working in medium and high magnetic fields |
| Marine Hardware | Special motor rotor parts, electromagnetic actuator parts, sensor components | Used where specific magnetic function is required; surface protection should be considered |
| Chemical Processing | Magnetic control parts, instrument rotor components, non-corrosive-area magnetic assemblies | Suitable for magnetic function parts; not primarily selected for acid corrosion resistance |
| Electrical & Electronics | Hysteresis motor rotors, magnetic devices, precision magnetic assemblies | Excellent hysteresis characteristics support efficient motor rotor performance |
Machinability, Welding and Heat Treatment
| Processing Property | Performance | Recommendation |
|---|---|---|
| Machinability | Machinable but not a free-cutting alloy like 303 stainless steel; processing depends on hardness and heat treatment condition | Use rigid machines, sharp carbide tools, suitable cutting speed and sufficient coolant |
| Welding Performance | Welding is not the primary fabrication method for rotor parts and may affect magnetic performance | Confirm welding procedure, heat treatment and magnetic property requirements before fabrication |
| Heat Treatment | Tempering and magnetic heat treatment are important for final hysteresis performance | Final heat treatment should follow working magnetic field, magnetic property target and project specification |
| Cold Working | Cold working can change mechanical and magnetic properties | Final tempering or magnetic treatment may be required after forming or machining |
| Surface Protection | Surface oxidation may occur during storage and transportation | Use oil protection, dry storage and export protective packaging |
Why Choose SAKY STEEL?
| Advantage | Description |
|---|---|
| Professional Precision Alloy Supply | SAKY STEEL supplies precision alloys including 2J11, 1J22, 1J46, 1J50, 1J79, 1J85, 3J elastic alloys, 4J expansion alloys and 6J resistance alloys for industrial and high-performance applications. |
| Customized Size Capability | Diameter, length, surface finish, tolerance, cutting service and machining allowance can be customized according to customer drawings or project requirements. |
| Quality Control and Traceability | Material traceability, heat number control, PMI testing, dimensional inspection, surface inspection, mechanical testing and magnetic property testing can be arranged. |
| Certificate Support | We can provide MTC (Mill Test Certificate / 质保书), EN 10204 3.1 certificate, PMI report, inspection report and other quality documents according to order requirements. |
| Export Packaging Experience | Export wooden cases, wooden pallets, protective wrapping, oil protection and clear labels help ensure safe delivery for international shipments. |
| Technical Service Support | Our team can support grade selection, equivalent standard checking, heat treatment discussion, magnetic property requirement confirmation and technical document preparation before shipment. |
FAQ
Q1: What is 2J11 Bar?
2J11 Bar is a Fe-Co-V magnetic hysteresis alloy bar, also classified as a permanent magnetic precision alloy. It is mainly used for hysteresis motor rotors and magnetic components working in medium and high magnetic fields.
Q2: What is the main feature of 2J11 magnetic alloy?
The main feature of 2J11 is excellent hysteresis characteristics. Its magnetic properties can be adjusted by heat treatment or tempering according to the required working magnetic field.
Q3: What is the chemical type of 2J11?
2J11 is an iron-cobalt-vanadium alloy. It typically contains cobalt, vanadium and balance iron, with controlled carbon, silicon, manganese, phosphorus, sulfur and nickel.
Q4: Can SASA ALLOY provide 2J11 Bar with MTC?
Yes. SASA ALLOY can provide MTC (Mill Test Certificate / 质保书), EN 10204 3.1 certificate, PMI report, dimensional inspection report, magnetic property test report and third-party inspection documents according to customer requirements.
Q5: What sizes of 2J11 Bar are available?
Common diameters include 6 mm to 200 mm. Length, tolerance and surface finish can be customized. Cut-to-length service is available for rotor machining and precision magnetic component production.
Q6: Is 2J11 easy to machine?
2J11 is machinable, but it is not a free-cutting alloy like 303 stainless steel. Rigid equipment, sharp carbide tools, suitable cutting speed and sufficient coolant are recommended to improve machining quality.
Q7: Can 2J11 be welded?
Welding is not usually the preferred fabrication method for 2J11 rotor parts because it may affect magnetic performance. If welding is required, the welding procedure, heat treatment and final magnetic properties should be confirmed before fabrication.
Q8: Does 2J11 require heat treatment?
Yes. Tempering or magnetic heat treatment is important for final hysteresis performance. The heat treatment process should be selected according to the required working magnetic field and magnetic property target.
Q9: What applications use 2J11 Bar?
2J11 Bar is used in hysteresis motor rotors, electromagnetic devices, aerospace magnetic parts, sensors, precision magnetic assemblies and high-efficiency motor components.
Q10: How can I get a quotation for 2J11 Bar?
Please send your required grade, diameter, length, quantity, surface finish, tolerance, heat treatment condition, magnetic property requirement and certificate requirements to SASA ALLOY. Our team will check availability, production route, delivery time and price for your project.
