Baosteel Transformer Core: Exceptional Strength for Energy Efficiency

Product Description

Product Description

 

Oriented silicon steel is a high-caliber, low-carbon silicon iron alloy enhanced with 0.5% to 4.5% silicon. This outstanding material boasts superb high permeability, which significantly curtails Joule loss in power applications. This enhancement not only amplifies operational efficiency but also heightens energy conservation attributes. Additionally, it showcases diminished iron loss and an elevated resistance coefficient, positioning it as the prime choice for modern power solutions.


Baosteel and WISCO, both affiliates of the BAOWU group, present B30P120 from Baosteel, a product renowned for its high permeability, perfectly equating to the 30QG120 from WISCO.

Type	Grade	Width	Max Core Loss@P1.7T/50Hz	Lamination Factor(%)	Min Induction@B800
Common Type	23Q110	35-1200mm	1.10w/kg	97.2	1.82T
	23Q120		1.20w/kg	97.2	1.82T
	27Q120		1.20w/kg	97.5	1.82T
	30G120		1.20w/kg	98	1.82T
High Induction Type	B20P085	35-1200mm	0.85w/kg	97	1.86T
	B23P085		0.85w/kg	97.2	1.88T
	B23P090		0.90w/kg	97.2	1.88T
	B23P095		0.95w/kg	97.2	1.88T
	B23P100		1.00w/kg	97.2	1.88T
	B27P095		0.95w/kg	97.5	1.89T
	27QG100		1.00w/kg	97.5	1.89T
	B30P120		1.20w/kg	98	1.89T
Domain Refined High Induction Type(Laser)	B20R070	35-1200mm	0.70w/kg	97	1.86T
	B23R085		0.85w/kg	97.2	1.88T
	B27RK085		0.85w/kg	97.5	1.89T

Magnetic properties
Experience unparalleled core efficiency with low core loss and high permeability, delivering outstanding application performance across diverse scenarios.
Thickness tolerance
Benefit from precise thickness tolerance and an exceptional high lamination factor, ensuring optimal performance.
Processing property
Tailored for punching and cutting, offering excellent dimension tolerance, guaranteeing precise and reliable outcomes.
Insulation coating
With minimal color deviation and impressive adhesiveness, our coatings provide superior resistance to heat and corrosion, coupled with high insulation coating resistance. Compliant with stringent EU RoHS and REACH regulations, ensuring safety and reliability.

 

We diligently calculate and frequently update our quotations based on your meticulously detailed drawings, guaranteeing unmatched precision and cost-effectiveness.

Upon receiving your confirmation, we seamlessly transition into production, rigorously following the meticulously detailed drawings you provide, ensuring unparalleled quality and precision.

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FAQ

 

1. Which products can we provide?
CRGO mother coils, slit coils, transformer lamination, and OEM transformer cores.

2. Who are we?
Established in 1988, we are pioneers in CRGO silicon steel products in China and the exclusive users of Bao-steel. We have also established a joint laboratory with Baosteel.

3.How can we guarantee quality?
Our production process adheres strictly to the ISO9001:2015 Standard. Before placing an order, our engineers perform meticulous calculations. Post-production, we conduct rigorous tests before dispatching the products.

4. Why should you buy from us instead of other suppliers?
With over 30 years of expertise in producing transformer cores, we utilize advanced German slitting and cutting systems, including the Georg 800 cross-cutting E-stack machine. Our annual production capacity exceeds 100,000 tons, making us a reliable choice.
 

Purchasing a good-quality transformer core is critical because it directly affects no-load loss, efficiency, noise, temperature rise, and service life. Below is a practical, industry-oriented guide you can use when sourcing cores from any supplier.

1. Define Your Technical Requirements First

Before contacting suppliers, be very clear about:

(a) Electrical parameters

• Transformer type: distribution / power / dry-type / amorphous

• Rating (kVA / MVA)

• Frequency: 50 Hz or 60 Hz

• Voltage class

• Target no-load loss (W) and exciting current (%)

• Noise limits (especially for distribution transformers)

(b) Core structure

• Core type: 3-leg, 5-leg, shell type

• Joint type: step-lap (preferred) or mitred

• Stacking factor requirement (≥ 0.97 for GO steel)

• Lamination thickness:

  • GO silicon steel: 0.23 / 0.27 / 0.30 mm

  • Amorphous: ~0.025 mm

2. Select the Right Core Material

(a) Grain-Oriented Silicon Steel (GOES)

Key points:

• Use Hi-B or Laser-scribed Hi-B

• Check steel brand and grade:

  • Examples: 23ZH90, 23ZH100, 27Q120, 30Q130

• Request original mill test certificate (MTC)

Important parameters to verify:

• Core loss (W/kg) @ 1.7 T

• Magnetic induction (B800 or B1000)

• Aging factor

• Coating type (C-5 / C-6)

(b) Amorphous Alloy (for ultra-low loss)

• Confirm alloy brand and ribbon source

• Check annealing process and brittleness control

• Ensure supplier has experience in amorphous cut-core handling

3. Evaluate the Core Manufacturer (Very Important)

A good core is not only about steel-it's about processing capability.

Ask about:

• Core cutting line (Georg, Föppl, or equivalent)

• Automatic step-lap cutting & stacking

• Annealing furnace (temperature control & atmosphere)

• Quality inspection equipment

Factory quality system:

• ISO 9001 mandatory

• ISO 14001 / ISO 45001 preferred

• Experience with utility / EPC / export projects

4. Key Quality Checks Before Purchase

Request the following before mass order:

(a) Prototype or sample core test

Ask for:

• No-load loss (W)

• Exciting current (%)

• Noise level (dB)

• Core weight & dimensions

(b) Documentation

• Steel MTC from original mill

• Core loss test report

• Dimensional drawing

• Packing & rust-prevention method

(c) Joint & stacking inspection

• Step-lap consistency

• No burrs on lamination edges

• Uniform pressure on yokes

• Proper insulation coating (no peeling)

5. Packaging & Logistics (Often Overlooked)

Poor packing can destroy a good core.

Ensure:

• Anti-rust protection (VCI paper / oil film)

• Strong wooden crate with shock protection

• No lamination displacement during transport

• Moisture protection for sea shipment

6. Supplier Qualification Checklist (Quick Use)

Uses branded GO steel (not mixed grades)
Provides mill certificates
Has step-lap cutting lines
Offers loss guarantee (contractual)
Supports FAT / third-party inspection
Has stable export experience

7. Recommended Purchasing Process

1. Shortlist 2-3 qualified core manufacturers

2. Compare technical proposal, not only price

3. Request sample core or reference projects

4. Place trial order

5. Approve supplier for long-term cooperation

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