Suitable for electromagnetic cores, yokes, relay cores, solenoid valve parts, sensor magnetic circuit components, and soft magnetic metal materials requiring high magnetic conductivity.
Electrical pure iron DT4C is a low-carbon, low-impurity soft magnetic material with high permeability, low coercivity, and good magnetic induction performance. It is commonly used in electromagnets, relays, yokes, cores, suction cups, sensor magnetic circuits, solenoid valves, instruments and meters, and parts requiring magnetic conductivity. Compared to ordinary carbon steel, DT4C's core advantage is not structural strength, but soft magnetic performance and magnetic circuit efficiency, making it suitable for electromagnetic components that require magnetic conductivity, magnetic engagement, magnetic field concentration, and low hysteresis loss.
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.
High magnetic permeability, low coercivity, good magnetic permeability, high magnetic induction strength, suitable for electromagnetic suction structures, suitable for soft magnetic parts, good machinability, can be annealed to improve magnetic performance, suitable for electromagnetic equipment and instrument parts.
Solenoid cores, relay cores, solenoid valve cores, yokes, magnetic poles, magnetic suction cup parts, sensor magnetic circuit components, instrument magnetic parts, motor magnetic circuit auxiliary parts, low-frequency electromagnetic components, magnetic shielding parts, electromagnetic brake parts, electromagnetic clutch parts, magnetic circuit guide blocks, soft magnetic structural components.
High-strength load-bearing parts, high-hardness wear-resistant parts, highly elastic 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, precision magnetic cores requiring extremely low frequency and high-speed magnetic loss, parts requiring stainless steel appearance and corrosion resistance, and metal parts that require no rust protection or 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 electromagnetic cores, yokes, relay cores, solenoid valve parts, sensor magnetic circuit components, and soft magnetic metal materials requiring high magnetic conductivity. |
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| Precision performance | Electrical pure iron DT4C 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 clearance. |
| Dimensional tolerances | For CNC machined electrical pure iron DT4C, the standard dimensional tolerances can be referenced as ±0.02mm-±0.10mm, while ordinary structural parts can be evaluated at ± 0.10mm-±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 DT4C 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 | DT4C is suitable for machining holes, grooves, steps, chamfers, threads, magnetic pole surfaces, suction surfaces, and ordinary structural details. Because the material is relatively soft, small 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 | DT4C's original machined surface usually has a silver-gray or gray-black metallic texture, prone to oxidation, rust spots, or knife 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.
Solenoid cores, relay cores, solenoid valve cores, yokes, magnetic poles, magnetic suction cup parts, sensor magnetic circuit components, instrument magnetic parts, motor magnetic circuit auxiliary parts, low-frequency electromagnetic components, magnetic shielding parts, electromagnetic brake parts, electromagnetic clutch parts, magnetic circuit guide blocks, soft magnetic structural components.
Suitable for electromagnetic cores, yokes, relay cores, solenoid valve parts, sensor magnetic circuit components, and soft magnetic metal materials requiring high magnetic conductivity.
The main feature of DT4C pure iron for electrical engineering is its excellent soft magnetic properties, making it suitable for magnetic conduction, magnetization, and magnetic circuit conduction in electromagnetic equipment. It has relatively low carbon and impurity content, which helps reduce hysteresis loss and improve magnetic permeability. DT4C material is relatively soft, with low strength and hardness, making it unsuitable to replace structural steels such as 45# steel and 40Cr for high-strength loads. As iron-based materials, they are prone to rust in exposed environments and usually require blackening, nickel plating, zinc plating, painting, rust inhibitors, or other surface protection.
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 DT4C.
Post-processing of Electrical-Grade Pure Iron DT4C 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 DT4C 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 higher structural strength is required, 45# steel, 40Cr, or low-alloy steel can be chosen, but their magnetic properties are usually inferior to DT4C; If higher corrosion resistance is required, stainless steel can be chosen, but most stainless steels have lower magnetic permeability than electrical pure iron; If a stacked magnetic core with lower 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 only ordinary metal structural parts are made, you can choose Q235, 20# steel, or 45# steel.
If the customer's core requirements are electromagnetic attraction, magnetic conductivity, magnetic circuit conduction, low coercivity, and high permeability, DT4C is the appropriate choice for electrical pure iron. If customers only have ordinary structural brackets, housings, or load-bearing parts, it is not recommended to prioritize DT4C; instead, Q235, 45# steel, aluminum alloy, or stainless steel can be chosen. If parts require long-term rust protection, outdoor use, or work in humid environments, DT4C should be used for surface protection or material solutions should be re-evaluated based on magnetic performance requirements.
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