DT4 Relay & Sensor Iron Rods | Beilun Metal
High-Permeability DT4 Pure Iron Rods for Precision Electromagnetic Control Systems
Product Overview
Beilun Metal's DT4 Pure Iron Rods deliver superior magnetic responsiveness and stability for relay coils, current sensors, and IoT control modules. With ultra-low coercivity (<32 A/m) and high saturation flux density (≥2.15T), our rods ensure rapid switching and signal accuracy in automotive relays, smart grid sensors, and industrial automation systems. Certified to GB/T 6983 and IEC 60404-8-6 standards.
Key Features & Benefits
Grade-Specific Magnetic Excellence
Material: DT4 (Equivalent to ARMCO® Pure Iron)
Core Loss: <1.5 W/kg (1.0T, 50Hz)
Coercivity: ≤30 A/m (DC magnetizing field)
Precision-Machined Consistency
Diameter Range: 1mm–50mm (±0.05mm tolerance)
Surface Finish: Cold-drawn (Ra ≤1.6μm) or ground (Ra ≤0.4μm)
Straightness: ≤0.1mm/m (critical for automated coil winding)
Stability Under Dynamic Loads
Operating Temperature: -40°C to +150°C
Permeability Drift: ≤±2% (over 10⁵ switching cycles)
Vibration Resistance: 5G @ 10–500Hz (MIL-STD-810G tested)
Corrosion & Oxidation Protection
Optional Coatings: Zinc-nickel electroplating, black oxide, or epoxy passivation.
Salt Spray Resistance: 500h+ (ASTM B117, coated variants)
Applications in Relay & Sensor Systems
Automotive Relays: EV contactor cores, fuse box magnetic actuators.
Current Sensors: Rogowski coil cores, Hall effect device flux concentrators.
Smart Grids: Energy meter current transformers, fault detection solenoids.
IoT Devices: Smart home relay rods, HVAC valve position sensors.
Technical Specifications
| Parameter | Value |
|---|---|
| Material Standard | GB/T 6983 DT4 (Fe ≥99.8%) |
| Density | 7.87 g/cm³ |
| Resistivity | 12 μΩ·cm |
| Max. Flux Density | 2.2T (at 10kA/m) |
| Certification | RoHS, REACH, IATF 16949 |
Why Choose Beilun Metal?
Relay-Specialized Production: 10,000+ MT annual capacity for Φ1mm–Φ100mm rods.
Zero Defect Winding-Ready: 100% eddy current testing for subsurface flaws.
Custom Heat Treatment: Stress relief annealing (750°C) to optimize permeability.
Just-in-Time Delivery: Kanban-supported inventory for JIT manufacturing partners.
Sustainability Commitment
Closed-loop water recycling in rod drawing process; 98% recycled steel scrap utilization rate.
FAQ
Q: Can DT4 rods replace silicon steel in high-frequency relays?
A: Yes! DT4's lower eddy current loss outperforms silicon steel above 400Hz.
Q: Do you provide rods pre-cut to coil bobbin lengths?
A: Yes – Precision cutting to ±0.1mm with deburred edges (ISO 2768-f standard).
Q: How to prevent hydrogen embrittlement in plated rods?
A: Our post-plating baking (200°C/4h) reduces H₂ content to <0.1ppm.
Q: MOQ for prototype orders?
A: Sample rods available from 100mm length (any diameter).
Contact Us
Optimize your electromagnetic systems with Beilun Metal's DT4 precision rods. Request free magnetic hysteresis curve data!
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