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Location: HOME > PRODUCTS > Carbon steel > Pure Iron Series > DT4A Electromagnetic Pure Iron

DT4A Electromagnetic Pure Iron

DT4A is grade A electromagnetic pure iron per GB/T 6983, soft magnetic low-carbon iron with low coercivity, high permeability, no magnetic aging, good cold workability, widely used for DC magnetic components.

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DT4A is electromagnetic pure iron under GB/T 6983. Grade A features excellent soft magnetic properties: high magnetic permeability, low coercivity and no magnetic aging. It has low carbon & impurity content and good cold formability. After annealing, it is widely used for DC electromagnets, solenoid cores, relay armatures, magnetic yokes and magnetic shielding parts.

Executive Standards

GB/T 6983-2008 (Electromagnetic Pure Iron Bars); GB/T 6984 (Hot-Rolled Sheets); GB/T 6985 (Cold-Rolled Sheets/Strips)

Reference Standard: Approximately ASTM A848 Grade 1 (no exact equivalent grade exists)

Electromagnetic Properties (Key indicators after annealing)

Coercivity (Hc): ≤72 A/m

Maximum Permeability (μmax): ≥8.8 mH/m

Magnetic Induction (B): B200 ≥1.20 T, B1000 ≥1.50 T, B5000 ≥1.71 T, B10000 ≥1.80 T

Mechanical Properties (Reference values for hot-rolled/annealed state)

Tensile Strength: ≥265 MPa; Elongation after fracture: ≥25%; Hardness (HV): ≤195

Available Forms (Common for export)

Pure iron round bars, sheets, cold-rolled strips, and flat bars; suitable for cutting, stamping, and bending.

Chemical composition (% )

C	Si	Mn	P	S	Al	Cr	Ni	Cu
≤0.025	≤0.20	≤0.30	≤0.020	≤0.020	0.15~0.50	≤0.10	≤0.20	≤0.20

Comparison Table for DT4 / DT4A / DT4E / DT4C Electromagnetic Pure Iron (GB/T 6983-2008)

Grade	Class	Coercivity (Hc) Upper Limit (A/m)	Core Positioning	Key Advantages	Applicable Scenarios
DT4	Standard	≤96	Basic/Economy	Offers the best value for money; readily available in stock; easy to process; meets standard soft magnetic requirements.	Standard solenoid valves, relays, electromagnetic locks, basic magnetic shielding, and magnetic separation tooling
DT4A	Advanced	≤72	Mainstream High-End	Superior magnetic consistency and better resistance to magnetic aging compared to DT4; provides the best overall cost-performance ratio.	Batch-produced electromagnets, precision solenoid valves, and general magnetic-permeable components for instruments
DT4E	Premium	≤48	Stable (Standard Lead Time)	Strict control over magnetic aging; minimal magnetic drift during long-term use.	Precision sensors, instrument cores, and small-scale DC electromagnetic assemblies
DT4C	Super	≤32	Top-Tier Precision	Features the best soft magnetic properties in this series; strictest control over impurities; highest magnetic permeability.	Components for high-end precision instruments, aerospace, and medical equipment; high-precision magnetic shielding; and specialized tooling for scientific research

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.

Previous:1100 / EN AW-1100 Pure Aluminum Plate

Next:DT4 Electromagnetic Pure Iron (Electrical Pure Iron)

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.

Hot Rolling Production Line

Cold rolling precision processing

Cold drawing/cold rolling line

Hot Rolling Production Line

Hot rolling production line (producing hot-rolled coils/medium-thick plates, thickness 2–60mm)

Cold rolling precision processing

(Producing ultra-thin / high-precision / shiny panels, with thickness ranging from 0.1 to 3mm, for high-end products)
Cold drawing/cold rolling line

(High-precision cold-drawn round steel, square steel, hexagonal steel, and special-shaped bars)

Cold drawing/cold rolling line

(High-precision cold-drawn round steel, square steel, hexagonal steel, and special-shaped bars)

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