1J22 Bright Bar
1J22 bright bar is a cold-worked,highly polished round metal bar made from high-quality 1J22 iron-cobalt-vanadium soft magnetic alloy through precision cold drawing,peeling,or polishing processes.It features an exceptionally clean and smooth surface, along with precise dimensional tolerances.This alloy is known worldwide under brand names such as Hiperco 50 or Permendur.
Key Technical Properties
- Highest Magnetic Saturation:
It boasts the highest saturation magnetic induction intensity (2.4T) among all soft magnetic materials.This allows electrical components to be engineered much smaller and lighter without losing power. - High Curie Temperature:
With a Curie point of 980°C,it maintains excellent magnetic stability in high-temperature environments where other soft magnetic alloys would demagnetize. - High Magnetostriction Coefficient:
It yields a high output energy efficiency,making it optimal for acoustic applications. - Low Electrical Resistivity:
At 0.27 μΩ·m,its low resistivity means it experiences high eddy current losses,making it poorly suited for high-frequency AC applications.
Applications of 1J22 Bright Bar
- Aircraft Rotors
- Stator Cores
- Aviation Motors
- Spacecraft Components
- Magnetic Bearings
- Sonar Transducers
- Ultrasonic Vibrators
- Pole Pieces
- Switching Relays
- Solenoid Valves
- Electromagnet Heads
- Magnetic Shielding
- Torque Motors
- Acoustic Diaphragms
- Actuator Cores
- Microwave Devices
We offer 1J22 bright bars in diameters ranging from OD ∮10mm to 101mm,manufactured in compliance with GB/T 14986.3 / ASTM A801.
In addition to stainless steel bright bars,we supply high-performance alloy pipes made from Hastelloy, Incoloy, Inconel, and Monel—fully compliant with PED 2014/68/EU and CE marks for pressure equipment.All our production and testing processes are certified to ISO 9001,and products are delivered with EN 10204 3.1 Mill Test Certificates.With over a decade of experience in manufacturing,import,and export,we are your most trusted wholesaler in China.
In addition to stainless steel bright bars,we supply high-performance alloy pipes made from Hastelloy, Incoloy, Inconel, and Monel—fully compliant with PED 2014/68/EU and CE marks for pressure equipment.All our production and testing processes are certified to ISO 9001,and products are delivered with EN 10204 3.1 Mill Test Certificates.With over a decade of experience in manufacturing,import,and export,we are your most trusted wholesaler in China.
Chemical Composition of 1J22 Bright Bar
The 1J22 bright bar is a high-saturation,iron-cobalt-vanadium (Fe-Co-V) soft magnetic alloy.Its chemical composition is strictly regulated by standard specifications such as GB/T 14986.3 and ASTM A801.
| Co | V | Mn | Si | Ni | C | P | S | Fe |
|---|---|---|---|---|---|---|---|---|
| 49.0 – 51.0 | 1.40 – 1.80 | ≤ 0,30 | ≤ 0,30 | ≤ 0.50 | ≤ 0.04 | ≤ 0,02 | ≤ 0,02 | Equilíbrio |
Impact of Trace Impurities on Magnetic Yield
Interstitial impurities like Carbon,Sulfur,and Phosphorus distort the crystal lattice.If these limits are exceeded in a batch,the material will exhibit a higher coercive force and severe core losses.
Consequently, high-purity vacuum induction melting (VIM) or vacuum arc remelting (VAR) is mandatory during manufacturing.
Consequently, high-purity vacuum induction melting (VIM) or vacuum arc remelting (VAR) is mandatory during manufacturing.
The Vital Role of Vanadium
Pure 50Fe-50Co alloys are extremely brittle and virtually impossible to cold-draw or peel into “bright bars.”The addition of approximately 1.5% Vanadium suppresses the atomic ordering process during cooling.This allows the material to remain sufficiently ductile at room temperature for the cold-finishing and mechanical polishing processes required to make a bright bar.
The Critical "Co-Fe" 50:50 Ratio
The equiatomic ratio of Iron to Cobalt is the scientific reason this material achieves a saturation induction value of 2.4T,which is higher than any other commercially available magnetic alloy.
1J22 Bright Bar Standards & Equivalent Designations
| 1J22 (High Saturation Iron-Cobalt-Vanadium Soft Magnetic Alloy) | |||||
|---|---|---|---|---|---|
| Padrão / Sistema | Designação Equivalente | Formulário do produto | GB / GB/T (China) | GJB (Military) | ASTM / MIL (USA) |
| Padrão chinês | 1J22 | Bright Bars & Rods | GB/T 14986.3 | GJB 3323A | ASTM A801 Type 1 |
| US Trade Name | Hiperco 50 / Supermendur | Cold-Drawn Wire | – | – | MIL-A-47182 |
| UNS System | R30005 | Hot-Rolled Bars | – | – | – |
| European / DIN Designation | Vacoflux 50 / 1.3950 | Forged Billets | – | – | – |
| UK Standard | Permendur / Permendur 2V | Strips & Sheets | – | – | – |
| Russian / GOST Standard | 50KF (50КФ) | ||||
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Mechanical Properties of 1J22 Bright Bar
The mechanical properties of a 1J22 bright bar are unique because they depend heavily on the material’s heat treatment state.In its as-supplied (cold-finished/bright) state,the alloy is strong but highly brittle.After magnetic final annealing,the mechanical strength decreases, and the material becomes extremely brittle due to atomic ordering,making post-heat-treatment machining nearly impossible.
| Propriedade mecânica | As-Supplied / Cold-Finished State | Post-Magnetic Annealing State |
|---|---|---|
| Resistência à tracção | 800 – 1100 MPa | 450 – 550 MPa |
| Força de rendimento | 700 – 900 MPa | 300 – 400 MPa |
| Alongamento | ≤ 5% | ≈ 1% – 2% |
| Dureza | ≈ 250 – 320 HV | ≈ 190 – 240 HV |
| Módulo de elasticidade | 170 – 180 GPa | 200 – 210 GPa |
The Challenge of "Order-Disorder" Transformation
At temperatures below 730°C,the iron and cobalt atoms in 1J22 undergo an ordering transition (creating a B2 superlattice structure).This atomic ordering makes the material extremely brittle at room temperature.The addition of 1.4% – 1.8% Vanadium suppresses this process during rapid cooling,allowing the material to retain just enough ductility to be cold-drawn or centerless ground into a “bright bar.”
Machining Guidelines for Bright Bars
1J22 bright bars must be cut,turned,threaded,and shaped in their as-supplied (unannealed) state.
Once the parts undergo final magnetic annealing,their elongation drops to near zero.Trying to machine,drop,or heavily stress the parts after annealing will cause them to chip,crack,or shatter like glass.
High Yield Strength at Cryogenic Temperatures
For aerospace or superconductivity applications,1J22 demonstrates excellent mechanical stability at lower temperatures.Unlike standard structural steels that suffer from low-temperature embrittlement,1J22 maintains its structural integrity under high centrifugal forces (such as in high-speed aviation rotors) if properly supported.
The Balance Between Mechanical and Magnetic Properties
- Cold Drawing (Bright Bar):
Introduces internal stresses → High tensile strength → Poor magnetic soft properties (high core loss). - Final Annealing:
Eliminates internal stresses → Low tensile strength → Peak magnetic soft properties (2.4T saturation).
Our Advantages in Manufacturing 1J22 Bright Bar
Advanced Vacuum Melting
Our facility utilizes a combination of Vacuum Induction Melting (VIM) and Vacuum Arc Remelting (VAR) to produce the raw 1J22 material. This dual-vacuum metallurgy setup allows us to strictly limit harmful interstitial impurities such as carbon,sulfur,and phosphorus to ultra-low levels well below standard specifications.By ensuring a pristine iron-cobalt matrix,we guarantee that the final bright bars achieve their maximum theoretical saturation magnetic induction of 2.4T with minimal core losses.
Precision Surface Finishing
We employ advanced centerless grinding, precision peeling,and multi-pass cold drawing lines to manufacture our 1J22 bright bars. This specialized cold-finishing infrastructure allows us to deliver bars with exceptional dimensional accuracy,achieving tight outer diameter tolerances down to h9 or h11.Furthermore,our automated polishing process eliminates surface micro-cracks and imperfections, resulting in a mirror-like “bright” surface that reduces machining allowances and tools wear for our customers.
Optimized Grain Structure
Controlling the fragile iron-cobalt-vanadium atomic ordering phase requires profound metallurgical expertise.We implement proprietary intermediate thermal-mechanical processing cycles during the rolling and drawing stages to carefully control grain size and suppress premature brittleness.This engineered microstructure optimizes the balance between internal stress and ductility,ensuring that our bright bars maintain excellent machinability and structural uniformity when you turn,cut,or shape them into rotors and cores.
Rigorous Quality Assurance
Every batch of our 1J22 bright bars undergoes comprehensive quality testing certified to ISO 9001 and aerospace standards.Our testing workflow includes 100% eddy current non-destructive testing for surface defects,ultrasonic inspections for internal voids,and precise magnetic performance testing using permeameters.All shipments are accompanied by a fully traceable EN 10204 3.1 Mill Test Certificate, ensuring absolute compliance with GB/T 14986.3 and ASTM A801 specifications for high-stakes aerospace and military applications.
FAQs About 1J22 Bright Bar
Pure 50% Iron – 50% Cobalt alloys undergo an “atomic ordering” transition upon cooling,which makes them extremely brittle and impossible to mechanically process.Adding a small amount of Vanadium suppresses this rapid ordering phase,giving the material enough ductility to be cold-worked,machined,and ground into high-quality bright bars at room temperature.
No.1J22 bright bars must be cut,turned,drilled,and threaded in their as-supplied (unannealed/cold-finished) state.Final magnetic annealing triggers a complete atomic ordering process that makes the alloy extremely brittle.Trying to machine the parts post-annealing will result in fracturing,cracking,and severe tooling damage.Only light,non-stressing operations like precision EDM wire cutting or gentle grinding should be done after annealing.
A 1J22 bright bar is a cold-finished,highly polished round metal rod made from an iron-cobalt-vanadium (Fe-Co-V) soft magnetic alloy.Its defining feature is its highest saturation magnetic induction intensity (2.4T) among all soft magnetic materials.The term “bright bar” means it has undergone precision cold drawing,peeling,or centerless grinding to achieve tight dimensional tolerances and a smooth surface finish.
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