Electromagnetic shielding pure iron** (≥99.8% Fe) is a specialized soft magnetic material engineered to block or attenuate electromagnetic interference (EMI) and radio-frequency interference (RFI). Unlike composite shields or conductive coatings, it leverages ultralow carbon content (≤0.004%) and defect-free crystalline
Microstructural Advantages
|
Parameter |
Pure Iron (DT4C) |
Mu-Metal |
Carbon Steel |
|
Coercivity (A/m) |
15–32 |
48–120 |
80–500 |
|
Permeability (μmax) |
15,000–18,750 |
80,000–100,000 |
1,000–5,000 |
|
Saturation (T) |
2.15 |
0.8 |
2.0 |
|
Density (g/cm³) |
7.86 |
8.7 |
7.85 |
Pure iron's higher saturation prevents magnetic saturation in intense fields-unlike Mu-metal, which fails abruptly above 0.8T .
Technical Specifications
Our shielding-grade pure iron complies with DT4A/DT4C (GB), ASTM A848, and ISO 683-3 standards, with properties enhanced via:
- Vacuum annealing: 750°C/2hrs in 10⁻³ mbar to reduce coercivity by 60%
- Texture control: <100> grain orientation boosting permeability by 25%
- Surface passivation: Chromate-free coating preventing rust without compromising weldability
Available Forms & Performance Metrics:
|
Form |
Thickness/Range |
Typical SE (dB) |
Key Applications |
|
Cold-Rolled Sheets |
0.1–6.0 mm |
62–75 (1 GHz) |
MRI rooms, transformer housings |
|
Forged Enclosures |
5–100 mm |
85+ (10 kHz) |
Particle accelerator chambers |
|
Fine Powder (YP010) |
1–20 μm particle |
35–50* (2.4 GHz) |
Conductive polymers for drone shields |
|
Laminated Strips |
0.05–0.3 mm |
55–68 (500 MHz) |
Cable shielding, sensor foils |
Fabrication Guidelines: Maximizing Shielding Performance
1. Machining & Forming
- Laser cutting: Use N₂ assist gas to avoid edge oxidation (degrades μ by 8–12%)
- Welding: TIG with Ar-2%H₂ shield gas; post-weld anneal at 700°C to restore permeability
- Bending: Minimum radius = 2× thickness; anneal after >15% cold deformation
2. Shielding Design Rules
+ Optimal thickness: 1.5× skin depth (δ) at target frequency
+ Overlap joints by 20mm with conductive epoxy (Ag-filled)
- Avoid sharp corners: Radius >5mm prevents flux leakage
Critical FAQs for Design Engineers
Q: How does pure iron compare to graphene or MXene composites?
A: Superior for frequencies <1 GHz due to magnetic domain absorption. Composites excel >3 GHz but lack structural rigidity .
Q: Can it shield static magnetic fields (e.g., MRI stray fields)?
A: Yes-2mm sheets reduce 1.5T static fields by 98% via flux shunting (vs. 70% for steel) .
Q: Is coating required for outdoor use?
A: Optional. Forms stable patina like Corten steel. For saltwater exposure, specify Zn-Ni electroplating (+0.5dB SE boost) .
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