Engineered for Magnetic Excellence
Electromagnetic performance is not just about purity-it is about controlled grain structure and minimal hysteresis loss. Our hot-rolled billets are specifically processed to enhance magnetic responsiveness:
Ultra-Low Coercivity (Hc): Achieved through strict control of carbon, nitrogen, and inclusions that pin magnetic domain walls.
High Maximum Permeability (μmax): Optimized hot rolling and annealing cycles promote grain growth favorable for easy magnetization.
High Saturation Induction (Bs): Iron content typically exceeds 99.6%, ensuring strong magnetic flux density under low field strength.
Low Remanence (Br): Minimal residual magnetism after field removal for applications requiring rapid demagnetization.
Magnetic Performance Indicators
| Property | Typical Value | Benefit |
|---|---|---|
| Coercivity (Hc) | ≤ 80 A/m (can achieve ≤ 40 A/m) | Faster response, lower energy loss |
| Maximum Permeability (μmax) | ≥ 4,000 (can achieve ≥ 8,000) | Higher sensitivity in low fields |
| Saturation Induction (Bs) | ≥ 2.15 T | Strong magnetic force generation |
| Remanence (Br) | 0.6 - 0.9 T (application dependent) | Controlled residual field |
| Electrical Resistivity | ~0.10 μΩ·m | Reduced eddy current losses |
Note: Magnetic properties are influenced by final component annealing. We can recommend post-processing cycles based on your application.
Controlled Chemistry for Stable Magnetics
Every billet starts with a precise chemical recipe designed to minimize magnetic interference:
| Element | Electromagnetic Grade Target | Why It Matters |
|---|---|---|
| Carbon (C) | ≤ 0.003% | Carbon pins domain walls; ultra-low C is essential for soft magnetics |
| Sulfur (S) | ≤ 0.002% | Forms non-magnetic sulfides that impede domain movement |
| Phosphorus (P) | ≤ 0.010% | Controlled to avoid embrittlement while maintaining resistivity |
| Silicon (Si) | 0.05% - 0.15% | Slightly increases resistivity to reduce eddy currents |
| Manganese (Mn) | 0.10% - 0.20% | Combines with S to minimize its negative magnetic effects |
| Aluminum (Al) | ≤ 0.02% | Kept low to avoid AlN precipitates that hinder grain growth |
| Nitrogen (N) | ≤ 0.003% | Forms nitrides that severely degrade permeability |
Hot Rolled for Optimal Starting Structure
Our billets are hot-rolled under controlled temperature and reduction ratios to:
Refine Grain Size Uniformly: Ensuring consistent magnetic behavior throughout the billet.
Minimize Internal Stresses: Reducing residual stress that can distort magnetic response.
Provide Clean Surface: Scale-free or minimally scaled surface for easier inspection and charging.
Frequently Asked Questions
Q: Do I need to anneal these billets after receiving them, or are they ready to use?
A: The billets are supplied in the hot-rolled condition. For optimal magnetic performance in finished components, a final annealing (e.g., 800-900°C in hydrogen atmosphere) is typically required to relieve rolling stresses and maximize grain growth.
Q: Can you guarantee specific coercivity (Hc) values?
A: Yes. For critical applications, we can sample and test the billet material to guarantee a maximum Hc value (e.g., ≤ 80 A/m or ≤ 40 A/m). This requires agreement on sampling methods and is noted on the certification.
Q: What sizes are available for electromagnetic components?
A: We offer standard billet sizes from 100mm to 150mm square, and can cut to your specified length to fit your forging or rolling equipment. Custom cross-sections are available for volume orders.
Q: How does your electromagnetic pure iron compare to electrical steel?
A: Our billets are the raw material for producing finished components, whereas electrical steel is typically thin sheet. Our billets are designed for customers who forge, roll, or machine their own parts before final annealing-giving you control over the entire manufacturing process.
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