Product Overview
We manufacture high-purity iron rods (C ≤ 0.004%) using controlled in-house annealing processes to eliminate internal stress, enhance magnetic uniformity, and improve mechanical workability. Our multi-step treatment-slow heating, soaking, and gradual cooling-ensures consistent grain structure and batch-to-batch reliability. These rods are ideal for precision applications like magnetic sensors, instrument cores, and components requiring dimensional stability and minimal machining waste. Factory-direct control guarantees predictable magnetic properties and reduced warpage.
Key Features (Annealing-Driven Advantages)
✅ Ultra-Low Residual Stress
Proprietary annealing eliminates 95%+ of internal stress from manufacturing-prevents warping, cracking, or dimensional shifts during post-processing (e.g., CNC machining, grinding).
✅ Enhanced Magnetic Uniformity
Controlled grain refinement ensures consistent magnetic permeability (initial μi: 4,000–8,000) across the entire rod-critical for precision magnetic sensors, transformers, and instrument cores.
✅ Superior Machinability
Annealing softens the iron (Brinell Hardness: 80–100 HB) while retaining ductility-reduces tool wear by 30% and enables tighter machining tolerances (±0.005mm) vs. unannealed rods.
✅ Dimensional Stability
Low thermal expansion coefficient (11.8 × 10⁻⁶/°C) and stress-free structure ensure rods maintain size and shape in temperature-fluctuating environments (e.g., lab equipment, industrial sensors).
✅ Ultra-High Purity Retention
Annealing is performed in a protective nitrogen atmosphere to avoid oxidation or contamination-preserves the rod's low-impurity profile (C ≤0.004%, S ≤0.006%) for uncompromised performance.
✅ Custom Annealing Profiles
We tailor annealing parameters (temperature, soak time, cooling rate) to your needs-e.g., higher temperatures for maximum stress relief, or shorter cycles for magnetic property optimization.
Technical Specifications (Precision & Annealing Standards)
| Parameter | Specification |
|---|---|
| Material | High-Purity Annealed Pure Iron (ASTM A848 Grade 1) |
| Annealing Process | Protective nitrogen atmosphere; 850–950°C heating, 2–4hr soaking, 50°C/hr cooling rate |
| Chemical Composition (Max) | C: 0.004%; Si: 0.02%; Mn: 0.07%; P: 0.008%; S: 0.006% |
| Magnetic Properties | Initial Permeability (μi): 4,000–8,000; Coercive Force: <1.2 Oe |
| Mechanical Properties | Brinell Hardness: 80–100 HB; Tensile Strength: ≥290 MPa; Elongation: ≥30% |
| Dimensional Tolerances | Diameter: ±0.005mm (precision grade); Straightness: ≤0.3mm/m |
| Diameter Range | 3mm – 150mm (standard); custom sizes (1mm–200mm) available |
| Length Range | 300mm – 5,000mm (standard); cut-to-length (50mm+) with ±0.1mm tolerance |
| Surface Finish | Annealed (Ra ≤0.8μm); optional: Polishing (Ra ≤0.2μm) for ultra-smooth applications |
| Testing | Residual stress analysis (X-ray diffraction), magnetic uniformity testing, dimensional inspection, hardness testing |
| Certification | Annealing Process Report, Material Test Report (MTR), Magnetic Property Certificate |
Call to Action
Need precision annealed pure iron rods for your critical applications?
Contact us today for technical specifications, samples, and custom quotations. Our engineering team is ready to help you select the optimal material solution for your requirements.
Contact us for a customized solution!
📫：sales3@beilunmetal.com
📞：8619335134327
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