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Oriented silicon steel exports from China power a global transformer boom. Listed transformer companies buy CRGO to build cores. Consequently, the export chain links steel mills, slitters, core shops, and transformer OEMs. At Jiangsu Zhongtong Weiye Special Steel Co., Ltd. in Wuxi, we sit in that chain as a CRGO supplier. Here is what buyers ask.

Q1: Why Do Listed Transformer Companies Source CRGO from China?

Chinese mills produce over half the world’s CRGO. Furthermore, domestic prices sit at multi-year lows. Consequently, overseas transformer makers cut core material cost. Furthermore, Chinese mills ship M3, M4, and M5 grades with full MTC documentation.

Q2: Which Grades Actually Ship in Export?

Grade	Core loss (W/kg @1.7T)	Typical use
M3	~0.70	Premium grid transformers
M4	~0.85	Standard power transformers
M5	~1.05	Distribution transformers

We ship M3 Grain Oriented Electrical Steel, M4 Grain Oriented Electrical Steel, and M5 Grain Oriented Electrical Steel.

Q3: What Dimensions Do Exporters Order?

Most export orders specify:

• Thickness: 0.27 mm or 0.30 mm.
• Width: 914 mm, 1000 mm, or slit to core width.
• Coil ID: 508 mm.
• Weight: 5–15 tons per coil.

Furthermore, core shops ask for slit strip ±0.05 mm. Consequently, we slit to order within 5–10 days.

Q4: What Documentation Does Export Need?

Every CRGO export shipment includes:

• MTC EN 10204 3.1.
• Core loss test per ASTM A343 / IEC 60404-2.
• Commercial invoice and packing list.
• Certificate of origin on request.

Consequently, the cargo clears customs and enters your QA system without delay.

Q5: How Does the Export Chain Benefit Listed Companies?

Listed transformer OEMs benefit in three ways:

1. Cost: low Chinese CRGO prices protect margins.
2. Supply: Chinese mills deliver consistently.
3. Quality: modern Hi-B grades match international standards.

Furthermore, stable core supply lets OEMs book export orders with confidence.

What We Supply

We ship CRGO coil:

• Grades: M3, M4, M5.
• Thickness: 0.23–0.35 mm.
• Slit to width: ±0.05 mm.
• Coil ID: 508 mm or 406 mm.
• Packing: VCI paper, wooden pallets, export crates.

Furthermore, we ship from Shanghai or Ningbo to worldwide ports.

What We Do Not Do

We do not:

• Manufacture finished transformers.
• Trade copper or winding wire.
• Supply amorphous metal cores.

Consequently, we are your upstream CRGO coil supplier.

Start Your CRGO Export Order

Tell us:

1. Grade (M3, M4, M5).
2. Thickness and slit width.
3. Quantity (tons).
4. Destination port.

We will confirm stock and current pricing within one working day.

• Email: vera.liang@ztwysteel.com
• Location: Xishan District, Wuxi, Jiangsu, China
• Supply range: CRGO grain-oriented steel M3/M4/M5, CRNGO non-oriented steel
• Slitting tolerance: ±0.05 mm
• Documentation: MTC EN 10204 3.1, commercial invoice, packing list, certificate of origin

We reply within one working day.