1J85 Bright Bar
1J85 bright bar is a high-quality,precision-machined round bar made from 1J85 Permalloy that has undergone mathematical smoothing, centerless grinding,or high-gloss polishing,resulting in a clean, reflective surface free of scale.1J85 Permalloy is a soft magnetic iron-nickel alloy with a nickel content of approximately 79% to 81%,a molybdenum content of approximately 4.8% to 5.2%,and the remainder being iron.
Core Characteristics & Functions
- Ultra-High Permeability:
It achieves exceptionally high initial and maximum magnetic permeability under very weak magnetic fields. - Low Coercivity:
It exhibits minimal magnetic resistance,meaning it magnetizes and demagnetizes rapidly with almost zero residual magnetism. - High Saturation Induction:
It maintains stable electrical efficiency in specialized core structures. - Stress Sensitivity:
Its supreme magnetic performance is highly sensitive to mechanical stress.Completed components must undergo precise vacuum high-temperature annealing at 1100°C–1150°C to eliminate internal stress and unlock its full performance potential.
Applications of 1J85 Bright Bar
- Transformer cores
- Sensor elements
- Shielding enclosures
- Relay armatures
- Magnetic heads
- Inductor cores
- Choke coils
- Current probes
- Guidance systems
- Sonar transducers
- Radar modules
- Avionics instruments
- Solenoid valves
- Actuator components
- Motor stators
- Clutch rings
We offer 1J85 (Permalloy 80 / ASTM A753 Alloy 4) bright bars in diameters ranging from OD 2mm to 201mm, manufactured in compliance with GB/T 14986.2 and ASTM A753.
Beyond magnetic alloys,we supply high-performance alloy pipes (Hastelloy, Incoloy, Inconel, and Monel) that are 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 all 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 1J85 Bright Bar
The chemical composition of the 1J85 alloy is rigorously controlled to optimize its magnetic domain structure and ensure peak soft magnetic performance.According to the Chinese national standard GB/T 14986.2 and equivalent international specifications like ASTM A753 Alloy 4,the precise chemical percentage weights are as follows:
| Ni | Mes | Minnesota | Si | C | P | S | Fe |
|---|---|---|---|---|---|---|---|
| 79.0 – 81.0 | 4.80 – 5.20 | 0,30 – 0,60 | 0.15 – 0.30 | ≤ 0.03 | ≤ 0,02 | ≤ 0,02 | Equilibrio |
Ultra-Low Carbon for Low Coercivity
Interstitial elements like carbon,sulfur,and phosphorus are intentionally minimized during vacuum induction melting.Any remaining carbon atoms warp the crystal matrix,creating microscopic energy barriers.This phenomenon restricts the fluid motion of magnetic domain walls,directly increasing coercivity and causing unwanted magnetic hysteresis loss.
Precision Nickel-Molybdenum Balance
The precise target of ~80% Ni paired with 5% Mo is engineered to reduce both the magnetocrystalline anisotropy constant and the magnetostriction constant to near-zero values.This specific structural harmony ensures the bright bar can be magnetized to saturation under extremely weak external magnetic fields.
Core Impurity Control VS Magnetic Permeability
Uncontrolled non-metallic inclusions act as internal physical defects.These defects block magnetic flux lines.For premium bright bars destined for high-sensitivity transformer cores,manufacturers enforce stricter internal quality limits on impurities than those printed in basic commercial standards.
Vacuum Annealing Requirement
The chemical composition alone cannot unlock the bar’s magnetic potential.Lathe cutting,centerless grinding,and polishing induce severe internal mechanical stresses that alter the matrix lattice.Finished components must undergo a secondary final hydrogen or vacuum heat treatment at 1100℃ to 1150℃.This high-temperature processing purifies the chemistry at a molecular level and fully restores the alloy’s supreme permeability.
1J85 Bright Bar Standards & Equivalent Designations
| 1J85 (Supermalloy / Permalloy 80 High Permeability Soft Magnetic Alloy) | |||||
|---|---|---|---|---|---|
| Estándar / Sistema | Designación equivalente | Forma del producto | GB / GB/T (China) | GJB (Military) | ASTM / MIL |
| Norma china | 1J85 | Bright Bars,Rods | GB/T 14986.2 | GJB 1512A | ASTM A753 Type 4 |
| US Trade Name | HyMu 80 / Permalloy 80 | Cold-Drawn Wire | – | – | MIL-N-14411C Comp 1 |
| UNS System | N14080 | Hot-Rolled Bars | – | – | – |
| European / DIN | 2.4535 / NiFe79Mo5 | Forged Billets | – | – | – |
| UK Standard | Mumetal Plus | Strips & Sheets | – | – | – |
| Russian / GOST | 79NM / 79NM-VI (79НМ-ВИ) | ||||
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Más información
Mechanical Properties of 1J85 Bright Bar
The mechanical properties of 1J85 bright bars vary significantly depending on the delivery state.Bright bars are typically supplied in either the Cold-Drawn state for high dimensional accuracy and optimal machinability,or the Soft-Annealed state.
| Propiedad | Cold-Drawn / Ground State | Soft-Annealed / Post-Heat Treatment |
|---|---|---|
| Fuerza de Tensión | 800 – 1000 MPa | 450 – 520 MPa |
| Fuerza de producción | 650 – 850 MPa | 150 – 180 MPa |
| Alargamiento | ≤ 5% | 35% – 45% |
| Dureza | 210 – 260 HBW / 220 – 270 HV | ≤ 130 HBW / ≤ 140 HV |
| Módulo de elasticidad | 200 – 210 GPa | 190 – 200 GPa |
The Work-Hardening VS Machinability Balance
In its fully soft-annealed state,1J85 is highly ductile and gummy, making it notoriously difficult to lathe-machine or drill cleanly without tearing or clogging the cutting tools.Therefore,premium 1J85 bright bars are purposefully cold-drawn and centerless ground to a higher hardness.This cold-worked state ensures crisp chip breaking,superior surface smoothness,and precise dimensional control during high-speed CNC machining.
Severe Post-Machining Softening
Once the raw bright bar is machined into final components,it must undergo a specialized high-temperature vacuum hydrogen anneal.This thermal process completely recrystallizes the grain structure.It deliberately strips away the mechanical strength,dropping the yield strength to near zero and boosting elongation.This structural shift is essential;the softer and more stress-free the crystal lattice becomes,the higher its magnetic permeability drops into place.
Stress Sensitivity
The supreme soft magnetic performance of 1J85 is directly linked to its mechanical state.Internal mechanical stresses,elastic deformations,or even accidental physical impacts create lattice distortions.These distortions trigger magnetoelastic anisotropy,which severely cripples the material’s magnetic shielding properties.Consequently,annealed 1J85 parts must be handled as delicate instruments and protected from any mechanical loads.
Physical and Elastic Constants
- Density: 8.75 g/cm3
- Poissons Ratio:0.31
- Melting Point:1450℃
- Thermal Expansion Coefficient:12.3 × 10-6/K
Our Advantages in Manufacturing 1J85 Bright Bar
Vacuum Induction Melting
Our facility utilizes advanced Vacuum Induction Melting technology to process raw materials.This airtight metallurgical process allows us to control the high nickel-molybdenum chemistry with absolute precision while extracting detrimental gases like oxygen and nitrogen.By maintaining ultra-low carbon levels under 0.02%,we eliminate matrix impurities that cause magnetic domain wall pinning,establishing an exceptionally pure structural foundation for supreme magnetic performance.
Precision Centerless Grinding
We pass our hot-rolled bars through continuous automated cold-drawing lanes followed by centerless grinding and high-speed polishing stations.This advanced processing achieves strict h8 to h6 diameter dimensional tolerances and eliminates all surface decarburization layers,micro-cracks,and rolling scales.The resulting mirror-like bright finish ensures optimal bar concentricity,enabling flawless feed operations and smooth chip breaking on high-speed CNC lathe machinery.
Advanced Magnetic Testing
Every batch of our bright bars undergoes comprehensive quality testing in our specialized laboratory before shipment.We operate advanced loop tracers and permeameters to verify critical magnetic parameters,including initial permeability,maximum permeability,and coercivity metrics.This rigid testing structure guarantees that our bars perfectly match the demanding technical baselines of international standards like ASTM A753 and GB/T 14986.2.
Tailored Heat Treatment
We provide expert technical consulting on the critical high-temperature vacuum annealing stage that unlocks the alloy’s magnetic properties.Our engineering team supplies customized thermal profiles—ranging from 1100°C to 1150°C in high-purity hydrogen environments—tailored specifically to your final machined component geometry.This specialized metallurgical support prevents grain growth distortion and ensures your finished parts achieve their peak magnetic shielding and permeability capabilities.
FAQs About 1J85 Bright Bar
Sí.Delivered in our precision cold-drawn and ground state,the bars have an optimized hardness level.This prevents the “gummy” behavior common to soft nickel alloys,allowing for clean chip breaking,excellent surface finishes,and minimal tool wear during CNC turning,drilling,and milling.
Absolutely.Every shipment of our 1J85 bright bars is accompanied by an official EN 10204 3.1 Mill Test Certificate.This document provides complete traceability,detailing the exact chemical composition from the vacuum induction melting heat,the mechanical properties,and the baseline magnetic test results.
Since 1J85 bright bars have a precision-ground surface and the alloy itself is highly sensitive to mechanical impacts and corrosion,we apply a strict multi-layer protective packaging system:
- Anti-Rust Coating:
Every bar is coated with high-grade,residue-free anti-rust oil. - Individual Wrapping:
Each bar is wrapped in moisture-proof plastic sleeves or wax paper to prevent inter-bar friction and scratching. - Bundling & Cushioning:
Bundles are tightly secured and lined with shock-absorbing foam or corrugated materials. - Heavy-Duty Export Crates:
The wrapped bundles are packed into rigid,IPPC-certified fumigated wooden boxes or steel-framed plywood crates to handle sea,air,or land freight stresses without bending or deformation.
Contacto
Póngase en contacto con nosotros
- RM901 No.22 Tangjiaqiao Road Wenzhou China
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
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