DT4 is a specialized electromagnetic pure iron grade defined by GB/T 6983 (equivalent to similar international grades like A848). It is characterized by:
Ultra-Low Carbon: Carbon content typically ≤ 0.010%, minimizing magnetic aging and coercivity.
High Magnetic Permeability: Designed for applications requiring efficient magnetic flux conduction.
Excellent Soft Magnetic Properties: Achieves optimal magnetic performance after final component annealing.
Consistent Purity: Controlled levels of Si, Mn, P, and S to ensure stable electromagnetic behavior.
Product Forms & Specifications
| Parameter | Details |
|---|---|
| Grade | DT4, DT4C (various magnetic performance levels) |
| Standard | GB/T 6983, comparable to ASTM A848 |
| Form | Cold rolled sheet / cold rolled plate |
| Thickness Range | 0.5 mm – 6.0 mm (sheet); 6.0 mm – 20 mm (plate) |
| Width Range | 500 mm – 1250 mm (custom widths available) |
| Length Range | 1000 mm – 3000 mm or cut-to-size |
| Surface Condition | Bright finish, pickled, or as-rolled |
| Delivery Condition | Annealed (soft) or non-annealed (for customer final annealing) |
Magnetic Properties (Typical, After Annealing)
| Property | DT4 |
|---|---|
| Coercivity (Hc) | ≤ 96 A/m |
| Maximum Permeability (μmax) | ≥ 2,500 |
| Saturation Induction (Bs) | ≥ 2.10 T |
| Magnetic Aging | ≤ 5% increase in Hc after aging test |
*Note: Magnetic properties are measured on annealed samples per GB/T 6983. Final component annealing is recommended for optimal performance.*
Chemical Composition (Typical, %)
Cold Rolled Advantage for Magnetic Components
Cold rolling provides distinct benefits for electromagnetic applications:
Precise Thickness Control: Tight tolerances (±0.05mm for sheet) ensure consistent air gaps in magnetic circuits.
Smooth Surface Finish: Bright, clean surface reduces insulation coating costs and improves stacking factor for laminated cores.
Uniform Grain Structure: Cold rolling followed by controlled annealing produces fine, uniform grains ideal for magnetic flux distribution.
Workability: Excellent for stamping, punching, and shearing into complex core shapes.
Frequently Asked Questions
Q: Do I need to anneal the sheets after cutting or stamping?
A: Yes. For optimal magnetic properties, components should undergo a final annealing after fabrication (typically 800-900°C in hydrogen or vacuum) to relieve cold work stresses and maximize grain growth. We can provide recommended annealing cycles.
Q: What thicknesses are available for relay core applications?
A: For small relay cores and stampings, we commonly stock thicknesses from 0.5mm to 3.0mm. For larger solenoid components, thicknesses up to 12mm are available as plate.
Q: Can you provide sheets with protective coating to prevent rust?
A: Yes. We can supply sheets with rust-preventive oil, or for extended storage, we offer packaging with VCI (vapor corrosion inhibitor) paper and shrink wrap. Please specify your requirements when ordering.
Q: What is the typical lead time for custom-sized DT4 sheets?
A: Standard sizes are available from stock for immediate shipment. Custom cut-to-size orders typically require 7-15 days depending on quantity and specification.
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