Precision-engineered NdFeB and magnetic assemblies optimized for global automotive, aerospace, and industrial automation networks.
In high-precision electromagnetic engineering, permanent magnets like Sintered NdFeB do not work in isolation. The optimization of any magnetic assembly (such as lifters, motors, and sensors) depends fundamentally on the selection of the return path material. Mild steel (low-carbon steel with carbon content typically < 0.25%, such as AISI 1008 or AISI 1010) serves as the primary magnetic flux conduit.
Due to its high elemental iron content, mild steel exhibits exceptional magnetic saturation (Bsat ≈ 2.1 to 2.15 Tesla) and high relative permeability (μr up to 2000 under ideal conditions). This allows it to absorb, focus, and redirect magnetic field lines generated by rare-earth magnets, preventing flux leakage and multiplying the structural holding forces of systems like pot magnets and magnetic lifters.
At Zhejiang Laysun Magnetics Ltd., we analyze the complete B-H loop of the magnetic circuit. By pairing our NdFeB grades with precision-machined, high-purity mild steel housings, we ensure that magnetic circuits achieve maximum force density without premature saturation limits.
Engineering metrics showing why low-carbon mild steel is the ideal flux-guiding substrate for high-power magnetic assemblies.
| Material Designation | Carbon Content (%) | Max Relative Permeability (μr) | Saturation Induction (Bsat - Tesla) | Coercive Force (Hc - A/m) | Ideal Application Profile |
|---|---|---|---|---|---|
| AISI 1008 / Low Carbon Mild Steel | < 0.08% | 2,000 - 2,500 | 2.15 T | ~80 A/m | Magnetic yokes, pot housings, flux returns |
| AISI 1018 Mild Steel | 0.15% - 0.20% | 1,500 - 1,800 | 2.10 T | ~120 A/m | Structural magnetic brackets, armature shafts |
| Silicon Iron (3% Si-Steel) | < 0.005% | 10,000+ | 2.00 T | ~30 A/m | AC transformers, high-speed stator stacks |
| Pure Iron (99.9% Armco) | < 0.01% | 5,000 - 10,000 | 2.16 T | ~10 A/m | Scientific instruments, custom calibration yokes |
Using Maxwell's Pull Force Formula, we can determine how the integration of mild steel alters the mechanical force of a permanent magnet:
F = (B2 · A) / (2 · μ0)
Where F is the holding force (N), B is the magnetic flux density at the interface (Tesla), A is the contact surface area (m2), and μ0 is the magnetic permeability of free space. When mild steel channels the field lines, it concentrates the flux (increasing B), which exponentially amplifies the holding force F (since force scales quadratically with flux density).
Founded in 1999, Zhejiang Laysun Magnetics Ltd. has evolved from a specialist rare-earth magnet workshop into a nationally recognized high-tech manufacturing enterprise. Spanning a cutting-edge 100,000 square meter production facility in Suining, Sichuan, we employ 300+ structural engineers, material scientists, and manufacturing experts.
Our facility generates over 5,000 tons of high-performance NdFeB magnets annually, supporting heavy industrial applications, advanced automotive EPS (Electric Power Steering), robotics, and high-efficiency home appliances. Driven by our core philosophies—Quality, Credibility, Technology, and Innovation—we design integrated systems that harmonize the intense performance of rare-earth magnets with the structural physics of low-carbon soft steels.
Ensuring metallurgical purity and geometric precision across every magnetic component we ship.
Our facility leverages Industry 4.0 manufacturing processes. Rare-earth element extraction, high-vacuum sintering, automated precision machining of mild steel components, and multi-stage electroplating (Ni-Cu-Ni, Zn, Epoxy) are integrated into a single cohesive production flow. This vertical integration addresses the following key market constraints:
Where high-energy permanent magnets interface with low-carbon steel components across major global industries.
Frameless and coreless servo motors rely on specialized arc magnets nested inside low-coercivity soft steel rotors to produce high peak torque values while mitigating cogging effects.
Unmanned aerial propulsion systems require high power-to-weight ratios. Laysun’s multi-pole ring magnets utilize ultra-thin mild steel hubs to minimize structure weight while maximizing magnetic field projection.
Traction motors operate under intense thermal stress. Our sintered magnets feature high coercivity (AH, EH grades) matched with silicon-steel and mild-steel laminations for minimal eddy current losses.
Brushless motors for heavy-duty drills, impact drivers, and saws leverage custom block NdFeB inserts to guarantee consistent torque profiles under variable structural loads.
Precision linear actuators for haptic engines, high-definition speakers, and MagSafe charging modules utilize thin-wall mild steel plates to shield adjacent internal components from magnetic stray fields.
Compressor motors for inverter air conditioners and variable-speed washing machines utilize custom bonded rings to drive energy efficiencies, reducing carbon footprints globally.
pioneering next-generation magnetic engineering solutions for the next decade.
By diffusing Dysprosium (Dy) or Terbium (Tb) selectively into the grain boundaries of sintered magnets rather than alloying, we achieve high coercivity while keeping raw material consumption low.
Developing component options where mild steel cores are replaced by resin-insulated iron powder cores, mitigating high-frequency eddy current losses inside AC electric motors.
Establishing close-loop NdFeB recovery procedures, recycling scrap material back into high-grade magnet production to reduce the environmental footprint.
Operating a global supply chain requires adherence to stringent regional frameworks. Zhejiang Laysun Magnetics Ltd. provides complete documentation for cross-border logistics and compliance:
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Expert technical answers regarding structural steel interfaces, saturation metrics, and system optimizations.
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Laysun Magnetics
