The High Purity Advantage
What sets DT4 and DT4C apart is not just low carbon-it is the systematic control of all elements that affect magnetic performance and alloy cleanliness. Our cold rolled sheets and plates are produced with:
Ultra-Low Total Impurities: Combined carbon, sulfur, phosphorus, and nitrogen typically below 0.020%
Controlled Tramp Elements: Pb, Sn, Sb, Bi, As each held to ≤ 0.003% for critical alloy smelting
Low Gas Content: Oxygen and nitrogen minimized for vacuum melting applications
Consistent Magnetic Response: DT4C grade achieves coercivity ≤ 48 A/m after final annealing
Cold Rolled Sheet & Plate Specifications
We supply DT4 and DT4C in forms optimized for both fabrication and melting applications:
| Parameter | Sheet (Stamping Applications) | Plate (Alloy Melting / Heavy Fabrication) |
|---|---|---|
| Thickness | 0.5 mm – 4.0 mm | 4.0 mm – 20 mm |
| Width | 500 mm – 1250 mm | 500 mm – 1000 mm |
| Length | 1000 mm – 3000 mm | 1000 mm – 2500 mm |
| Surface | Bright annealed, oiled | Pickled or as-rolled |
| Edge | Slit or sheared | Flame cut or sheared |
| Typical Use | Stamped laminations, relay parts | Melt stock, machined components |
For Electrical Industry: Magnetic Performance You Can Rely On
When you manufacture electromagnetic components, consistency is everything. Our cold rolling process ensures:
Uniform Thickness: Tight tolerances (±0.03mm for sheet under 2mm) for consistent air gaps and stacking factors
Excellent Punchability: Clean stamping edges with minimal burr formation
Annealed Condition: Supplied fully annealed for immediate fabrication, or as-rolled for customers who prefer final annealing after stamping
For Alloy Smelting: The Cleanest Starting Point
Alloy smelters choose our high purity plates because:
No Hidden Impurities: Full trace element analysis means you know exactly what you are melting
Consistent Chemistry: Batch-to-batch consistency reduces recipe adjustments
Solid Form Efficiency: Plates melt cleanly with minimal dross-no fines loss like powder or loose scrap
Certified Traceability: Each plate is heat-numbered, supporting your own quality certification to your customers
Frequently Asked Questions
Q: What is the main difference between DT4 and DT4C for electrical applications?
A: DT4C offers significantly lower coercivity (≤ 48 A/m vs. ≤ 96 A/m for DT4) and higher maximum permeability, making it the preferred choice for high-sensitivity relays, precision solenoids, and applications requiring minimal magnetic hysteresis. Both grades are fully certified.
Q: Can I use the same DT4C sheet for both stamping relay cores and as melt stock for alloy production?
A: Yes, but with consideration. For stamping, sheet thickness under 3mm is ideal. For melt stock, thicker plate (6mm+) is more efficient for furnace charging. We can supply both forms from the same heat to maintain chemistry consistency across your operations.
Q: How do you control tramp elements like lead and tin for alloy smelting applications?
A: We select virgin iron sources and carefully manage scrap input. Our ladle analysis includes these trace elements, and we can guarantee each to ≤ 0.003% for critical alloy applications. This level of control prevents grain boundary segregation in your finished alloys.
Q: Is DT4C suitable for brazing or welding in electromagnetic assemblies?
A: Yes. DT4C exhibits good weldability and brazeability due to its ultra-low carbon and controlled residuals. For brazed solenoid assemblies, the material maintains magnetic properties after brazing, especially if the braze cycle is kept below the final annealing temperature.
Q: What is the minimum order quantity for high purity DT4C material?
A: We support both small trials and production volumes. For DT4C with full magnetic certification and trace element analysis, typical MOQ is 1-2 tons for sheet and 3-5 tons for plate. Standard DT4 is available with lower MOQ. Contact us for trial quantities to validate your application.
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