Product Introduction
Hebei Hozee Electric Co., Ltd. customizes Oriented Silicon Steel Strip products for Uruguayan customers. Specifically, the company supplies high-quality Oriented Silicon Steel Strip that meets the customer's stringent requirements: the iron loss of the supplied oriented silicon steel is ≤ 0.95W/KG; the inner diameter of the silicon steel coil is 510 ± 10mm with a thickness tolerance of ± 0.02mm; the outer packaging consists of iron sheets and iron corner protectors that comply with maritime transportation standards, paired with fumigated wooden pallets to ensure the safety of sea shipments.
Scope of silicon steel supply
| Brand number | 18P65-30Q120 |
| Iron loss range | 0.58-1.15W/KG (P1.7/50) |
| Whole roll width | 960MM-1250MM |
| Whole roll weight | 1-5 tons |
| Customizable | Yes |
Application scope
Oriented silicon steel, featuring high magnetic permeability and low iron loss, is primarily used in the manufacturing of various transformer cores. It has also expanded its application to multiple high-end fields such as new energy, precision electronics, and national defense and military industry.
Advantages of Hozee
1. Profound Understanding of Silicon Steel Properties
Hebei Hozee Electric Co., Ltd. boasts over 15 years of production experience in the iron core and transformer industries. Throughout the production process, the company has a deep understanding and extensive experience in the performance of silicon steel products from various manufacturers.
2. Extensive Procurement Channels
Hebei Hozee Electric has witnessed the rapid development of oriented silicon steel in China. In practical production, it maintains in-depth cooperation with Baosteel, Wugang, Shougang, and various private silicon steel manufacturers, ensuring extensive and reliable procurement channels for silicon steel.
3. Rich Professional Knowledge Reserve
Rooted deeply in the silicon steel core industry, Hozee Electric possesses highly professional experience and technical reserves in iron core production. The company recommends suitable silicon steel materials to customers based on their actual needs, helping to reduce their trial-and-error costs and time. Hozee has always adhered to the philosophy that "the most suitable for customers is the best."
Production process
Silicon Steel Quality Certification
Strictly verify the quality certificate of incoming silicon steel to ensure that all performance indicators meet the required standards before entering the production process.
Slitting (Vertical Cutting)
Process the silicon steel into strips according to the width required by the customer. The width error range is ± 0.02mm, and burrs are allowed to be ≤ 0.001mm.
Harm of burrs: Burrs can increase the no-load current of the iron core and raise the temperature of the iron core; they also increase iron core noise, affecting the user experience of transformers. Therefore, special emphasis should be placed on burr control.
Cleaning
The cleaning process is a key link in ensuring the precision, product performance, and service life of subsequent iron core manufacturing.
Cleaning Standards for Transformer Silicon Steel Strips
1. Cleaning methods: The commonly used method is "degreasing cleaning + high-pressure air knife drying". For high-end silicon steel (such as HiB oriented silicon steel), an additional "vacuum cleaning" process is required to ensure thorough removal of iron filings.
2. Acceptance criteria:
- Visual inspection: The surface is free of visible oil stains, iron filings, and dust; no stains remain after wiping with white silk.
- Instrument detection: Residual oil pollution ≤ 3mg/m², residual iron filings ≤ 0.5mg/m² (required for high-end export orders).
- Insulation test: The insulation resistance between silicon steel sheets is ≥ 100MΩ (tested with a 500V megohmmeter at 25℃).
Essentially, the cleaning process of silicon steel strips removes impurities such as oil stains, iron filings, and oxide layers generated during processing. This protects the magnetic and insulation properties of silicon steel, ensures the precision of subsequent iron core manufacturing, and ultimately meets the energy-saving requirements, operational stability, and industry standards of transformers. For Hebei Hozee Electric's export business, strict cleaning processes are a crucial detail in avoiding customer acceptance risks and shaping the brand image of "high-end precision manufacturing". Especially for markets such as Europe, America, and Southeast Asia with strict product quality requirements, cleanliness directly affects order delivery efficiency.
Rust prevention treatment:
Rust prevention treatment of silicon steel strips is a key process to ensure the material's surface quality, insulation performance, and adaptability to subsequent processing-especially for precision materials like oriented silicon steel with surface insulation coatings. Rust prevention failure will directly affect the assembly and operational stability of transformer cores. The rust prevention logic focuses on isolating corrosive media (water, oxygen, salt), protecting the integrity of surface coatings, and adapting to storage and transportation cycles. Specific measures and industry practices are as follows:
Core Technical Measures for Silicon Steel Strip Rust Prevention
1. Source protection: Pretreatment and equipment control before slitting
- Control incoming material surface conditions: Ensure that the insulation coating of incoming silicon steel is not damaged or exposed, and the coating adhesion meets standards (such as the tape peeling test required by GB/T 2521-2023), reducing corrosion risks from the source.
- Equipment cleaning and drying: Regularly clean the cutting tools and guide rollers of slitting machines to avoid residual oil stains and iron filings; use rust-proof lubricating oil in the equipment's hydraulic and lubrication systems to prevent oil leakage and silicon steel surface contamination, while avoiding residual moisture in the oil.
- Workshop environment control: Maintain the relative humidity of the slitting workshop ≤ 50%; install dehumidifiers and salt spray filtration devices in coastal areas; prohibit direct contact with silicon steel surfaces with bare hands-operators must wear powder-free gloves to avoid hand sweat contamination.
2. Process protection: Online rust prevention treatment after slittingThis is the most commonly used core link in industrial production, which needs to be coordinated with the slitting and cleaning processes:
- Quick drying after cleaning: After the silicon steel strip is cleaned (degreased and rinsed), it must be dried by a combination of hot air drying and air knife blowing to ensure no residual moisture on the surface-moisture is the core cause of corrosion; even a thin water film on the surface can cause slight corrosion within 48 hours.
- Coating rust prevention media:
- Short-term rust prevention (7-30 days): For silicon steel strip materials delivered in the short term, volatile rust-proof oil is applied by spraying or roller coating, with an oil film thickness controlled at 5-10μm. It can isolate air and moisture, and can be quickly removed by wiping or baking before subsequent iron core lamination without affecting the insulation coating performance.
- Medium to long-term rust prevention (1-6 months): For products requiring storage or long-distance transportation, use composite packaging of vapor-phase rust-proof paper + rust-proof film: the vapor-phase rust-proof paper releases rust-proof factors to form a protective film on the silicon steel surface; the outer rust-proof film prevents moisture and dust and has a certain scratch resistance.
- Special protection for high-end oriented silicon steel: Some ultra-high voltage transformers use oriented silicon steel, which is coated with a water-based rust inhibitor after slitting. It has good compatibility with the insulation coating on the silicon steel surface, with a rust prevention period of more than 6 months. It can completely evaporate without residue during the subsequent annealing process.
- Edge rust prevention enhancement: The cut edges of strips are high-risk areas for rust; local spraying of rust-proof wax can be used to strengthen edge protection. The wax layer can fill damaged coatings and isolate corrosive media.
3. Special rust prevention requirements for the transformer industryFor silicon steel strip materials used in transformers, rust prevention treatment must consider both rust prevention effect and compatibility with subsequent processing:
- Rust prevention media shall not affect the interlayer insulation resistance of silicon steel sheets; therefore, the use of highly conductive rust-proof oil is prohibited.
- Rust-proof oil/agents must be easy to remove: they can be completely removed by wiping or low-temperature baking (<120℃) before iron core lamination without residue.
- It is prohibited to apply a thick oil film on the silicon steel surface, as this will affect the flatness of core laminations and reduce the lamination factor (for every 1% decrease in the lamination factor, the no-load loss of the transformer may increase by 2%-3%).
Roll up packaging:
Use vapor-phase rust-proof paper for wrapping and packaging to isolate moisture and salt in the environment, effectively achieving waterproofing and moisture absorption, and reducing the risk of silicon steel rusting.
Wooden pallet packaging:
- Do not stack the strip materials too high to prevent coating damage due to excessive pressure; firmly fix them during transportation to avoid friction and scratches on the strip surface.
- Use fumigated wooden pallets: Contact between silicon steel and metals of different materials (such as carbon steel pallets) can cause galvanic corrosion..
Port shipment- External Labeling
Develop external labels according to the customer's requirements for format and content, and affix 2-3 external labels. The external labels must have waterproof and oil-proof functions to avoid issues such as label detachment and blurred handwriting during long-distance sea transportation.
Wooden pallet details Silicon Steel Strip Details
FAQ
Transformer Core-Related
FAQ
Q: Why are horizontal 5-step lamination used for laminated iron cores?
A: Horizontal 5-step lamination is adopted for laminated transformer cores mainly due to the following technical advantages, which directly optimize the core's magnetic performance, structural stability, and operational efficiency:
1. Minimizing magnetic resistance and reducing no-load loss: The 5-step staggered joint design of the core eliminates the discontinuities in the magnetic flux path that exist with conventional 3-step lamination. This allows magnetic lines of force to pass smoothly through the silicon steel laminations along their oriented direction, significantly reducing magnetic resistance at the joints. As a result, the core's no-load loss can be reduced by 3% – 8%, meeting the design standards for high-efficiency energy-saving transformers.
2. Reducing operational noise from magnetostriction: The multi-step overlapping structure disperses the vibration stress generated by magnetostriction during transformer operation. Compared with 3-step lamination, this method can reduce core operational noise by 2 – 5 dB(A), improving the transformer's acoustic performance and suitability for noise-sensitive applications.
3. Enhancing structural stability and deformation resistance: The 5-step interleaved lamination creates a tighter interlocking structure between silicon steel sheets. This effectively prevents inter-lamination loosening and deformation during transportation and long-term high-vibration operation, making it particularly suitable for high-power transformer cores that require robust structural integrity.
4. Optimizing no-load current and improving power factor: Lower magnetic resistance reduces the excitation current (no-load current) required for the core to establish magnetic flux during no-load operation. This not only reduces reactive power loss but also improves the transformer's overall power factor, enhancing power grid operational efficiency.
5. Improving material utilization for large-cross-section cores: For large-capacity transformers with large-cross-section cores, the 5-step lamination design enables more precise cutting of silicon steel laminations, reducing trimming waste and improving material utilization. Meanwhile, it avoids stress concentration and lamination warping in large-cross-section cores, ensuring the flatness required for subsequent winding assembly.
Q: Can Hozee Electric provide core drawings according to customer requirements?
A: With over 15 years of experience in the transformer and transformer core manufacturing industry, Hozee Electric boasts a dedicated transformer core R&D and production team with professional technical personnel. We are capable of providing customized core drawings tailored to customer requirements.
Q: What is the production cycle for iron cores?
A: The production cycle is determined by the order quantity. For example, one container load can be shipped within 10 - 15 days after order confirmation. The specific delivery time needs to be negotiated and confirmed by both parties.
Q: What are the payment terms for iron cores?
A: Payment terms: After technical clarification, 30% of the contract value is required as a down payment, with the remaining balance paid in full prior to shipment.
Silicon Steel Strip-related
Q: What is the delivery cycle for silicon steel strips?
A: After technical disclosure and receipt of the advance payment, shipment can be made within 7-10 days.
Q: What is the minimum order quantity for silicon steel strips?
A: At least one container load.
Q: What is the payment method for silicon steel strips?
A: Payment terms: Cash payment with 40% of the total contract amount as a down payment, and the final payment shall be made after providing the clause list.
Q: Why is cleaning required after slitting silicon steel into strips? (Combined with transformer production scenarios)
A: 1. Remove processing oil stains to avoid deterioration of magnetic properties (the most important reason); 2. Remove iron filings and dust to prevent short circuits and precision deviations; 3. Remove surface oxide layers/stains to ensure coating adhesion; 4. Meet subsequent process requirements to avoid process contamination.
Q: Why is silicon steel prone to rust after being slit into strips?
A: 1. Protective layer damage during processing: The cutting and slitting process can generate mechanical stress, which may cause slight damage to the insulation coating (such as organic coatings and magnesium oxide coatings) on the silicon steel edges, exposing the base metal. At the same time, residual metal debris from slitting will form "galvanic corrosion" cathode points, accelerating substrate corrosion. 2. Erosion by environmental factors: Humidity in the production workshop (relative humidity > 60%), salt content in the air (coastal areas), and acid-alkaline substances in hand sweat (during manual handling) will all undergo oxidation reactions with the silicon steel substrate, forming red rust or black rust. Among them, red rust (iron oxide) will directly pierce the insulation coating, causing short circuits between silicon steel layers. 3. Storage and transportation time requirements: After being slit into strips, silicon steel usually needs to be stored for several days to several months before delivery to downstream customers (such as transformer factories). Without rust prevention treatment, even short-term storage may lead to rust due to excessive environmental humidity.
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