What is the recommended step-lap joint design?

A good core must have step-lap joints, not butt joints. Typical step numbers are 5-step, 7-step, or 9-step, where more steps result in better performance, lower no-load loss, and lower noise.

How to evaluate a core supplier?

Ask the supplier for steel brand and grade, loss guarantee values, step-lap design details, previous transformer references, and ISO/IEC compliance. A reliable core supplier is as important as the steel itself.

What are the minimum order quantity and lead time?

The minimum order quantity is 1 Ton. The average lead time is one month for both peak and off-peak seasons.

Premium M3 CRGO Transformer Core for Optimal Energy Efficiency

Name: Premium M3 CRGO Transformer Core for Optimal Energy Efficiency
Brand: Wuxi Julong Silicon Steel Co., Ltd
SKU: 2266328305

Jiangsu, ChinaWuxi Julong Silicon Steel Co., Ltd

US$2,200.00

1-9 Tons

US$2,100.00

10-24 Tons

US$2,000.00

25+ Tons

Product profile

Customization

Available

Application

Power

Phase

Single Three

Model NO.

B30P120

Core

Core-type Transformer

Cooling Method

Dry-Type Transformer Oil-Immersed Type Transformer

Winding Type

Certification

ISO9001

Usage

Single-phase Transformer, Rectifier Transformer, Combined Transformer, Power Transformer, Distribution Transformer

Frequency Characteristics

Power Frequency

Shape of Core

Step Lap Mitred Joint

Type

Oriented Silicon Steel

Standard

GB, AISI, ASTM, DIN, BS, JIS

Technique

Cold Rolled

Shape

Transformer Core

Brand

Julong

Sheet Width

35-1060mm

Transformer Core

OEM(According to Drawing)

Certification

ISO9001, 14001, 45001

Transport Package

Standard Export Package

Specification

According to drawing

Trademark

Julong

Origin

China

HS Code

85049019

Production Capacity

8000tons/Month

Key features

Precision Gap Control: Gap limit at joint meticulously controlled to maintain <1.0mm for structural integrity.

OEM Customization: Transformer core OEM service available according to customer drawings.

Premium Raw Materials: CRGO silicon steel sourced from Baosteel and WISCO for superior quality.

High Load Capacity: Automatic stacked core supports up to 60 tons; manual stacked core up to 120 tons.

Advanced Manufacturing: Equipped with German Georg 800 cross-cutting E-stack machine for precision.

Comprehensive Certifications: Certified with ISO9001, ISO14001, and ISO45001 for quality and safety.

Low Core Loss Options: Offers various grades including Hi-B and Laser-scribed for energy efficiency.

Company profile

Years of Export ExperienceStandardized quality controlIn-stock CapacityManagement Certification

Wuxi Julong Silicon Steel Co., Ltd

Jiangsu, China

Business Type: Manufacturer/Factory CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 18 Years CertifiedNearest Port: Shanghai PortAverage Response Time: ≤0.06h

AI-Powered supplier vetting

SummaryThe supplier operates in metal structures, magnetic materials, transformer-related manufacturing, and distribution switch-control equipment. It demonstrates documented quality, warehouse, supplier-assessment, complaint-handling, and corrective-action procedures, supported by raw-material traceability, 100% finished-product inspection, and nine quality inspectors. It holds ISO9001:2015, ISO45001:2018, ISO14001, and ISO50001 certifications. The supplier provides broad customization, ODM, and OEM services, with five R&D engineers supporting technical confirmation, product design, production, and after-sales service. However, it is not identified as a professional technical supplier, does not provide 3D software design or SDK services, and reported no new products in the past year. Evidence for overseas service coverage and customer cases is limited; the stated overseas-service country count is zero, while OEM for well-known brands is confirmed without customer names.

Supplier typeThe supplier is explicitly not classified as a professional technical supplier. Its stated business scope instead centers on metal structure manufacturing and sales, metal and magnetic materials, transformer-related manufacturing, and distribution switch-control equipment.

CertificationsThe supplier reports ISO9001:2015, ISO45001:2018, ISO14001, and ISO50001 certifications, covering quality, occupational health and safety, environmental management, and energy management.

After-Sales capabilityFive technology engineers are responsible for technical support during production and after-sales service, while complaint handling has a clear procedure with records. However, the stated overseas-service country count is zero, so international service reach is not demonstrated.

Production capacityProduction capability is supported by listed cutting, laminating, testing, and uncoiling/slitting machines, nine quality-control inspectors, two quality-control test-equipment units, and a one-month average lead time in both peak and off-season. The stated business scope also includes multiple relevant manufacturing activities.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, minor customization, and flexible customization. This range is stated consistently across the design-service records.

Product Q&A

Q:Which products can we provide?

We offer CRGO mother coils, slit coils, transformer lamination, and OEM transformer cores.

Q:Who are we?

Established in 1988, we are a pioneering force in CRGO silicon steel products in China, and the exclusive user of Bao-steel. Our joint laboratory with Bao-steel underscores our commitment to quality and innovation.

Q:How can we guarantee quality?

We strictly adhere to ISO9001:2015 standards. Our engineers conduct meticulous calculations before order placement, and we rigorously test each product post-production to ensure peak quality before dispatch.

Q:Why should you buy from us and not from other suppliers?

With over three decades of expertise in producing transformer cores, we leverage advanced German slitting and cutting systems, including the Georg 800 cross-cutting E-stack machine. Our impressive annual production capacity exceeds 100,000 tons.

Q:What are the key factors for core material selection?

Grain-oriented silicon steel is the best choice for power and distribution transformers. Key parameters include grade, core loss, magnetic flux density, and thickness. Low-loss distribution transformers benefit from Hi-B or Laser-scribed GO steel.