Suitable for manufacturing electromagnetic cores, relay cores, solenoid valve parts, yokes, poles, sensor magnetic circuit components, and soft magnetic metal parts with high magnetic conductivity requirements.
Electrical pure iron DT4E is a high-purity iron-based soft magnetic material used for electromagnetic components and soft magnetic parts, featuring high magnetic permeability, low coercivity, good magnetic induction strength, and stable magnetic permeability. Compared to ordinary structural steel, DT4E's core value is not its load-bearing strength, but its magnetic conductivity, magnetization, attraction, and reduction of hysteresis losses. It is commonly used in electromagnets, relays, solenoid valves, yokes, sensor magnetic circuits, magnetic attraction structures, and precision electromagnetic equipment components.
By focusing on application scenarios, boundaries of advantages, and non-recommended scenarios, it helps sales, customer service, and quoting staff quickly determine whether the material meets current part requirements.
It has high magnetic permeability, low coercivity, good magnetic conductivity, and high magnetic induction strength, making it suitable for electromagnetic attraction structures, precision magnetic circuit components, and can enhance magnetic performance through annealing. It is suitable for electromagnetic equipment and instrument parts.
Electromagnet cores, relay cores, solenoid valve cores, yokes, poles, magnetic suction cup parts, sensor magnetic circuit parts, instrument magnetic parts, electromagnetic brake parts, electromagnetic clutch parts, motor magnetic circuit auxiliary parts, low-frequency electromagnetic components, magnetic shielding parts, magnetic guide blocks, soft magnetic structural parts.
High-strength load-bearing parts, high-hardness wear-resistant parts, high-elasticity snap-fit parts, highly corrosive environment parts, long-term exposed outdoor parts, food direct contact parts, medical implant parts, high-temperature long-term load-bearing parts, high-frequency, high-speed low-loss magnetic cores, parts requiring stainless steel appearance and corrosion resistance, and metal parts that require rust-free maintenance.
The following parameters come from product information and material knowledge fields, used for design review, quotation communication, and preliminary judgment before material selection.
| Material positioning | Suitable for manufacturing electromagnetic cores, relay cores, solenoid valve parts, yokes, poles, sensor magnetic circuit components, and soft magnetic metal parts with high magnetic conductivity requirements. |
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| Precision performance | Electrical pure iron DT4E is suitable for CNC turning, milling, drilling, tapping, grinding, wire cutting, and general machining. The material is softer and easier to process, but it is prone to burrs, scratches, or deformation. It is recommended to separately control dimensional tolerances, flatness, and surface roughness of magnetic circuit mating surfaces, suction surfaces, positioning holes, and assembly surfaces. For parts requiring suction force, focus should be placed on controlling the flatness of the magnetic pole surface and the assembly air gap. |
| Dimensional tolerances | The conventional dimensional tolerances for CNC-machined electrical pure iron DT4E can be evaluated as ± 0.02mm to ±0.10mm, while ordinary structural parts can be evaluated at ±0.10mm to ±0.20mm. If parts require annealing, blackening, nickel plating, galvanizing, or spraying, slight dimensional changes may occur after post-processing. This value is a standard reference range and is not an absolute guarantee tolerance for all structures. Magnetic circuit mating surfaces, suction surfaces, and positioning holes should be separately marked with tolerance requirements. |
| Minimum Wall Thickness | The wall thickness of ordinary CNC machined structures is recommended to be no less than 0.8mm-1.0mm. Because DT4E material is relatively soft, thin-walled structures are prone to deformation or burrs, the load-bearing positions, thread positions, suction surfaces, and magnetic circuit cross-sectional areas should be appropriately thickened. When used for electromagnet cores or yokes, wall thickness and cross-sectional area should be comprehensively designed based on magnetic flux, magnetic saturation risk, and structural strength. |
| Recommended wall thickness | For ordinary soft magnetic structural components, it is recommended to be between 1.5mm and 3.0mm or more; the cross-sectional dimensions of the yoke, magnetic poles, iron core, suction block, and solenoid valve core should be determined according to magnetic circuit design, magnetic flux density, attraction force, and assembly method. For tapping, press-fitting, bearing assembly forces, or ensuring magnetic circuit cross-sectional area, it is recommended to be at least 2.0mm, and avoid local cross-sectional areas that are too narrow and cause magnetic saturation. |
| Minimum aperture | CNC machining can achieve smaller hole diameters, but deep and small holes require consideration of chip removal and burr control. For general designs, the recommended aperture is no less than 1.0mm. Screw holes, positioning holes, and assembly holes on magnetic circuit components should avoid excessively weakening the effective magnetic conductive cross-section. Holes near magnetic pole surfaces, attraction surfaces, or key magnetic circuit areas should be carefully arranged to avoid affecting magnetic flux distribution and attraction force. |
| Assembly clearance | For ordinary metal assemblies, it is recommended to reserve 0.05mm-0.20mm on one side; for ordinary plug-in and structural assemblies, 0.10mm-0.30mm can be reserved. The electromagnetic attraction surface and magnetic circuit closure surface should be controlled as much as possible with air gaps; excessive air gaps significantly reduce attraction force and magnetic circuit efficiency. If subsequent nickel plating, zinc plating, blackening, painting, or powder spraying are required, the impact of surface treatment thickness on the assembly gap and magnetic pole air gap should be considered. |
| Detailed performance | DT4E is suitable for machining holes, grooves, steps, chamfers, threads, magnetic pole surfaces, suction surfaces, and ordinary structural details. Because the material is relatively soft, fine edges and small holes are prone to burrs, so the magnetic circuit working surface should focus on deburring and ensuring flatness. Fine text, logos, and markings are recommended to be achieved through laser marking, engraving, or etching, but decorative textures that affect contact and magnetic paths are not recommended on key magnetic pole surfaces. |
| Surface effect | The original machined surface of DT4E is usually silver-gray or gray-black metallic, prone to oxidation, rust spots, or machined marks. After grinding and polishing, a relatively smooth metal surface is obtained; after blackening or phosphating, a black or gray-black rust-resistant appearance is obtained; nickel or zinc plating enhances rust resistance and appearance stability. When used as magnetic circuit components, surface effect is usually not the focus; magnetic performance, air gap control, and rust protection are more important. |
Based on material characteristics and suitable product ranges, customer needs are broken down into easier application directions to determine.
Electromagnet cores, relay cores, solenoid valve cores, yokes, poles, magnetic suction cup parts, sensor magnetic circuit parts, instrument magnetic parts, electromagnetic brake parts, electromagnetic clutch parts, motor magnetic circuit auxiliary parts, low-frequency electromagnetic components, magnetic shielding parts, magnetic guide blocks, soft magnetic structural parts.
Suitable for manufacturing electromagnetic cores, relay cores, solenoid valve parts, yokes, poles, sensor magnetic circuit components, and soft magnetic metal parts with high magnetic conductivity requirements.
The main feature of DT4E pure electrical iron is its excellent soft magnetic properties, making it suitable for magnetic conduction, magnetization, and circuit closure in electromagnetic systems. It has relatively low carbon and impurity content, which helps improve magnetic permeability and reduce coercivity. DT4E is generally more suitable than ordinary carbon steel for electromagnetic adsorption parts, but the material itself is softer, with lower strength and hardness, making it unsuitable to replace structural steels like 45# or 40Cr for heavy loads.
Based on wall thickness, hole position, assembly clearance, dimensional tolerances, and material usage risks, determine in advance whether the part structure is suitable for Electrical-Grade Pure Iron DT4E.
Post-processing of Electrical-Grade Pure Iron DT4E affects appearance, dimensions, hole position, assembly clearance, and usage validation results, and should be explained in advance during quotation, DFM review, and sample confirmation stages.
Post-processing should focus on appearance display, dimensional fitting, connection assembly, and testing verification. Parts involving assembly positions need to be reserved in advance for machining, coating, and trial assembly allowances.
For common issues such as threads, snaps, strength, temperature resistance, and weather resistance, identify in advance whether the material needs to be replaced or if another processing method should be used.
When customer demand exceeds Electrical-Grade Pure Iron DT4E material boundaries, it is necessary to combine strength, temperature resistance, toughness, long-term stability, and mass production goals to promptly recommend alternative materials or processing technologies.
If ordinary structural strength is required, Q235, 20# steel, 45# steel, or 40Cr can be chosen, but their magnetic properties are usually inferior to DT4E; If a laminated core with lower iron loss is needed, silicon steel sheets can be chosen; If high-frequency magnetic cores are needed, ferrite, laminate alloy, or other specialized soft magnetic materials can be chosen; If corrosion resistance and stable appearance are needed, stainless steel can be chosen, but most stainless steels have lower magnetic conductivity than electrical pure iron; If higher magnetic performance grades are required, the specific grade of pure electrical iron should be further selected based on magnetic permeability, coercivity, and supplier standards.
If the customer's core requirements are electromagnetic adhesion, magnetic conductivity, magnetic circuit conduction, low coercivity, and high permeability, the DT4E pure iron for electrical engineering is the appropriate choice. If the customer only needs ordinary structural brackets, housings, or load-bearing parts, it is not recommended to prioritize DT4E; instead, Q235, 45# steel, aluminum alloy, or stainless steel can be selected. If parts require long-term rust protection, outdoor use, or humid environments, DT4E should be applied for surface protection, or material options should be reevaluated between magnetic properties and corrosion resistance.
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