Premium Customizable Bao-Steel CRGO Silicon Steel Slit Coil

• Customization: Available
• Type: Oriented Silicon Steel
• Standard: GB, AISI, ASTM, DIN, BS, JIS
• Model NO.: B20R070
• Technique: Cold Rolled
• Shape: Coil
• Thickness: 0.20mm
• Iron Loss: 0.70W/Kg(1.7t/50Hz)
• Brand: Baosteel
• Width: 35-1000mm
• Inside Diameter: 508mm
• Transport Package: Export Wood Pallet
• Specification: 1200*1000*1100mm
• Trademark: Julong
• Origin: China
• HS Code: 72261100
• Production Capacity: 30000tons/Month

Product Description

Product Description

 

Oriented silicon steel is a low-carbon silicon iron alloy material with a silicon content of 0.5%~4.5%, which has characteristics such as high permeability(which can reduce Joule loss in power equipment, improve efficiency and energy-saving effects), lower iron loss and high resistance coefficient.

GRADE we supply:B30P120, B30P105, B30R100, 27QG120, 27QG100, 23Q110, 23QG100, 23QG095, 23RK090, 23RK085, 23QG085, 23RK085, 23QG085, 23RK080, 23RK075, B23R070, 20QG085, 20RK080, 20RK075, B20R070, B20R065,M0H,M1H,M2,M3,M4,M5.

23HP75d, 23HP80d, 23HP85d, 23HP90d, 23HP95d, 23HP100, 23HP100d, 27HP100, 27HP110, 27CG110, 27CG120, 30CG120, 30CG130

Raw material:CRGO silicon steel from Baosteel and 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
	B27P100		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
Low core loss,high permeability and excellent application performance.
Thickness tolerance
The good thickness tolerance and high lamination factor.
Processing property
Suitable for punching and cutting with excellent dimension tolerance.
Insulation coating
Small color deviation,good adhesiveness and excellent resistance to heating and corrosion with high insulation coating resistance. Comply with including EU RoHS and REACH regulations.
 

Company Profile

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Packaging & Shipping

FAQ

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

2. Who are we?
We are pioneer of CRGO silicon steel products in china since 1988,exclusive user of Baosteel,have established joint lab with Baosteel.

3.How can we guarantee quality?
We produce according to ISO9001:2015 Standard.Before placing order,our engineer will calculate carefully.After production,we will test it before sending out.

4. why should you buy from us not from other suppliers?
We have over 30years experience of producing transformer core, assembled with advanced Germany slitted cutting system,GEORG TBA800 Precision Cut E-stack cutting line.Our Annual transformer core production capacity is over 100,000 tons.
 

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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