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DT4C is a grade of "super" electromagnetic pure iron as defined by the GB/T 6983 standard. It represents the highest tier of magnetic performance within the DT4 series of soft magnetic materials. Characterized by strictly controlled impurity levels, it offers the lowest coercivity, the highest magnetic permeability, and minimal magnetic aging. It features excellent workability, and its magnetic properties remain stable following vacuum annealing. It is primarily used for precision magnetic-conductive components, such as those found in high-end sensors, precision instruments, aerospace magnetic cores, and high-standard magnetic shielding.
Electromagnetic Properties (Verified after annealing)
Coercivity (Hc): ≤32 A/m
Maximum Magnetic Permeability (μmax): ≥15.1 mH/m
Increase in Coercivity due to Aging (ΔHc): ≤4.0 A/m
Magnetic Induction: B1000 ≥ 1.50 T, B5000 ≥ 1.71 T, B10000 ≥ 1.80 T
Common Specifications for Export
Cold-rolled sheets/coils, hot-rolled plates, round bars, and flat bars. Thickness ranges from 0.3 to 6 mm; bar diameters range from Φ6 to 120 mm. Slitting and cutting services are available.
Application Scenarios
High-precision sensors, magnetic yokes for precision instruments, high-end magnetic shielding components, specialized relays, precision solenoid valves, aerospace instrument cores, and low-loss DC electromagnets.
Material Advantages
Extremely high magnetic permeability, low coercivity, and low hysteresis loss; minimal magnetic aging, ensuring stable magnetic performance during long-term operation; excellent plasticity, facilitating stamping and machining; compatible with nickel plating and phosphating processes. Each shipment includes a Material Test Certificate (MTC) and an independent magnetic inspection report.
Delivery Condition & Surface Finish
Hot-rolled (black/unscaled), pickled, cold-rolled (bright finish), or polished; anti-rust oil coating available upon request.
Chemical composition (% )
Comparison Table for DT4 / DT4A / DT4E / DT4C Electromagnetic Pure Iron (GB/T 6983-2008)
Magnetic Aging Explained
DT4: No strict magnetic aging requirements; suitable for short-term or general operating conditions.
DT4A: Superior control over magnetic aging compared to DT4.
DT4E: Low magnetic aging; subject to mandatory, standardized control of aging-related property shifts.
DT4C: Lowest coercivity combined with optimal aging stability; ideal for long-term, high-precision applications.
Common Characteristics (Shared by All Four Grades)
Low-carbon soft iron material with excellent plasticity; easy to process via turning, milling, grinding, wire-cut EDM, or stamping.
Consistent Machinability: All four grades offer excellent plasticity and are suitable for cutting, machining, and annealing. Available in various forms: blocks, round bars, plates, and coils/strips.
Documentation (MTC/material certificates and magnetic property test reports) available upon request; export-standard wooden crate or pallet packaging provided.
Selection Guide
Budget-focused, general electromagnetic components → DT4
High-volume production requiring stable magnetic properties at a balanced cost → DT4A (Recommended primary choice)
Equipment intended for long-term, continuous operation where magnetic performance must not degrade over time → DT4E
High-precision instruments, scientific research, or advanced equipment requiring extremely low magnetic loss and high repeatability → DT4C
Payment Methods
Flexible payment terms available: T/T and L/C. For new clients, 30% advance payment for production, balance against copy of B/L. L/C is acceptable for large & regular orders to secure both parties.
Warehousing Management
Before each batch of steel leaves the factory, a complete process inspection is strictly carried out. From chemical composition, mechanical properties to dimensional tolerance and surface quality, each item is carefully checked to ensure compliance with national standards and export regulations. At the same time, the quantity, packaging and rust prevention treatment are also verified. An original factory warranty certificate is attached, guaranteeing the quality. Before shipment, inspection photos are provided. Any non-compliant items will not be released, and the quality is fully controllable throughout the process. This ensures your overseas purchasing is safe and worry-free.
All items are visually inspected before delivery. No cracks, deformation, rust, scratches or cutting marks are allowed; edges must be smooth. Only visually sound products will be shipped.
Thickness, width, length, wall thickness, outer diameter have been measured. Straightness, curvature, torsion, diagonal tolerance all meet the corresponding tolerance requirements.
Quality inspection includes: mechanical property tests (yield strength, tensile strength), elongation rate, impact energy, hardness testing, chemical composition testing, process performance testing, etc.
Inspection according to packaging requirements: secure binding, moisture-proof film, rust-proof paper, export fumigation/fumigation-free wooden crates, shipping marks, gross weight, net weight, etc.
We will provide full reception services to support the customers' on-site inspection of the goods.
Warehousing Management
A ten-thousand-ton standardized warehouse with grid-based zoning and system positioning enables rapid material retrieval and reduces the time spent searching for materials.
Inbound inspection: Verify the physical items against the inbound form, inspect the appearance, dimensions, and labels. Once confirmed to be correct, the materials are entered into the ERP system and processed for storage.
Logistics and Global Delivery: Self-operated fleet + contracted logistics partners; expedited service available for urgent orders.
International Shipping: Supports FOB, CIF, DDP, and other trade terms, covering 100+ countries and regions.
Process: Booking → Trucking → Customs Declaration → Loading onto Ship/Aircraft → Bill of Lading Issuance → Document Delivery → Destination Port Customs Clearance (Optional) → Last-Mile Delivery.
Provides door-to-door one-stop logistics with full tracking to ensure safe and timely arrival of goods.
After-Sales Service and Traceability: Delivery receipts, logistics information, and quality inspection documents are sent to customers within 24 hours of shipment.
Established a full product lifecycle traceability system, allowing tracking of production, quality inspection, warehousing, and transportation records.
Follow-up inspection within 72 hours of arrival; rapid response and handling of quality issues; assistance in resolving customs clearance issues for foreign trade orders.
Packaging Method
Fumigation-free plywood boxes
Steel strapping/bottom pallet
Vacuum/VCI Rust-Proof Paper
Steel plate frame reinforcement
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