Description
M19 CRGO Silicon Steel Coil Supplier — Factory-direct electrical steel coils in 0.23mm thickness with original mill test certificates for every shipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | M19 CRGO Silicon Steel Coil |
| Product Type | Cold Rolled Grain Oriented Electrical Steel Coil |
| Steel Grade | M19 (CRGO Silicon Steel) |
| Thickness | 0.23mm (coil); 0.3–14mm (coil range); 0.3–80mm (plate range) |
| Width | 1000mm / 1219mm / 1250mm / 1500mm / 1524mm / 1800mm / 2000mm or custom slit |
| Technique | Cold Rolled |
| Surface | 2B / 2D finish |
| Packaging | Waterproof paper + metal pallet + angle bar protection + steel belt; standard seaworthy packing |
| Application | Transformers / Motors / Generators |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Power Transmission & Distribution | Power transformer cores, distribution transformer lamination stacks |
| Electrical Equipment Manufacturing | Motor stator and rotor cores, generator laminations |
| Industrial Machinery | Reactor cores, inductor assemblies, magnetic shielding components |
Why Iron Loss Ratings Decide Transformer Efficiency Before It Ships
M19 CRGO silicon steel coil grades are defined by maximum iron loss values — not just chemical composition — and a mismatch between the mill certificate and actual magnetic performance can render an entire transformer batch non-compliant.
Procurement teams sourcing CRGO electrical steel frequently encounter a gap between what the mill test certificate states and what third-party retesting reveals. A coil labeled M19 may show iron loss values drifting toward M3 or M4 territory when independently verified, meaning the finished transformer core cannot meet design efficiency targets. This discrepancy often surfaces only after the container arrives at the destination port, triggering re-inspection delays, project schedule overruns, and in some cases, complete rejection of the lamination batch. [NEED_CITE: CRGO silicon steel iron loss classification per IEC 60404-8-7] The root cause is rarely the steel itself — it is the absence of pre-shipment magnetic property verification at the supplier’s lab before the material is loaded.
How 0.23mm Thickness Precision Supports Lamination Stacking in Transformer Cores
Transformer core manufacturers require tight thickness tolerance on CRGO coils because even minor deviation compounds across hundreds of lamination layers, affecting core window fill factor and overall magnetic flux path. The M19 CRGO silicon steel coil in 0.23mm thickness is cold rolled to maintain consistent gauge across the full coil width, ensuring uniform stacking density. This precision directly influences core loss performance — thinner gauges reduce eddy current losses, which is why 0.23mm has become the standard for high-efficiency distribution transformers. Our production lines run continuous thickness monitoring, and every coil is verified against the specified gauge before release.
Meeting Magnetic Performance Standards and Customs Documentation Requirements
Electrical steel used in transformer and motor cores must comply with recognized international standards governing magnetic properties, and customs authorities in many importing countries now require original mill test certificates that document both chemical composition and magnetic test results. [NEED_CITE: IEC 60404-8-7 grain oriented electrical steel specification requirements] The M19 grade designation indicates a specific maximum iron loss threshold, and buyers need documentation that confirms the delivered material meets that threshold — not just that it was produced on a CRGO line. For shipments entering markets with strict electrical equipment regulations, missing or incomplete magnetic property data on the MTC can delay customs clearance for weeks. We provide full heat-number traceability from coil to test report, supporting compliance documentation at destination.
Understanding M19 Grade CRGO Steel and Cold Rolling Process
The M19 designation in CRGO silicon steel refers to the maximum specific total loss (iron loss) measured at 1.7 Tesla and 50 Hz frequency — the lower the number, the more efficient the steel is at conducting magnetic flux with minimal energy loss. M19 sits in the mid-to-high efficiency range of CRGO grades, making it suitable for distribution transformers and industrial motors where energy efficiency standards are tightening. [NEED_CITE: CRGO grade classification system and iron loss comparison between M3, M4, M5, M6, M15, M19] The cold rolling process is critical to CRGO performance: the steel undergoes primary rolling, intermediate annealing, secondary cold reduction, and then high-temperature final annealing to develop the Goss texture — the preferred crystal orientation that gives grain-oriented steel its superior magnetic properties along the rolling direction. This process requires precise control at every stage, and any deviation in reduction ratio or annealing temperature can shift the iron loss value outside the M19 specification.
Hidden Costs When CRGO Material Does Not Match the Stated Grade
Procuring M19 CRGO silicon steel coil without independent verification of magnetic properties creates downstream risk across the entire project chain. If the iron loss exceeds M19 limits, the transformer core will generate excess heat and fail efficiency type tests — meaning the finished equipment cannot be commissioned. Customs authorities may hold the shipment if the MTC lacks magnetic test data or shows inconsistencies with the declared grade. [NEED_CITE: consequences of non-conforming electrical steel in transformer manufacturing] Beyond material replacement costs, the project faces lamination line downtime, delayed delivery to the end user, and potential contractual penalties. These costs are entirely avoidable when the supplier conducts pre-shipment magnetic testing and provides verifiable MTCs.
Why Procurement Teams Source M19 CRGO Silicon Steel Coil Through Us
We operate as a factory-direct supplier, meaning every M19 CRGO silicon steel coil is priced without intermediary markup — volume-based pricing programs apply for repeat procurement. Our in-house laboratory conducts magnetic property testing on every production batch before release, ensuring the iron loss values documented on the mill test certificate match the physical material in the coil. We maintain ready stock across multiple CRGO grades and thicknesses, supporting urgent project timelines and split shipment schedules. Every coil carries full heat-number traceability, and third-party inspection through SGS or BV is available upon request for buyers who require independent validation. Our export documentation team handles commercial invoices, packing lists, certificates of origin, and customs classification — reducing the risk of port-side delays. For long-term partners, we offer consolidated multi-product container loading, combining CRGO coils with other steel categories into a single shipment to optimize freight cost.
Documentation & Compliance
- Mill Test Certificate documenting M19 CRGO silicon steel chemical composition (Si, C, Mn, S content) and magnetic properties (iron loss P1.7/50, magnetic polarization J800) per batch
- ISO 9001:2015 quality management system certificate covering the full CRGO coil production and inspection process
- SGS or BV third-party inspection report available on request, covering visual inspection, thickness measurement, and magnetic property sampling
- Material traceability report linking each coil to its heat number, rolling schedule, and annealing batch for full supply chain transparency
- Customs documentation package including commercial invoice, packing list, bill of lading, and certificate of origin formatted to destination country requirements
Packaging, Loading & Delivery
- M19 CRGO silicon steel coil wrapped in waterproof paper with inner plastic film, mounted on metal pallets with angle bar edge protection and secured by steel belt strapping to prevent moisture ingress and mechanical damage during ocean transit
- Coil width and outer diameter matched to container internal dimensions — 20ft GP and 40ft GP loading plans optimized to maximize payload while maintaining weight distribution within port handling limits
- Heat number and M19 grade identification marked on each coil ID tag and outer wrapping, supporting warehouse receiving inspection and traceability at destination
- Custom slit-to-width orders packaged separately with interleaved protective paper to prevent edge damage and surface scratching during handling
- FOB, CIF, and DDP shipping terms available with full container tracking and port coordination support
Starting Your CRGO Procurement With Verified Material Data
Submit your specification sheet — including thickness, width, grade, quantity, and destination port — to receive a competitive quotation with factory-direct pricing, estimated production lead time, and a sample mill test certificate showing the magnetic property range for M19 CRGO silicon steel coil. For non-standard widths or custom slit requirements, our technical team will confirm feasibility and provide a tailored production schedule. All certification and customs documentation requirements can be reviewed before order confirmation.
Frequently Asked Questions
Q: What does the M19 grade designation mean for CRGO silicon steel?
A: M19 indicates the maximum specific total iron loss (in W/kg) measured at 1.7 Tesla magnetic flux density and 50 Hz frequency. It positions the material in the mid-to-high efficiency range, suitable for distribution transformers and industrial motors where energy loss reduction is a design priority.
Q: Can you provide mill test certificates with magnetic property data for customs clearance?
A: Yes. Every M19 CRGO silicon steel coil shipment includes an original mill test certificate documenting both chemical composition and magnetic test results (iron loss and magnetic polarization). Third-party inspection reports from SGS or BV are also available upon request.
Q: What widths and thicknesses are available for CRGO silicon steel coil?
A: Standard widths include 1000mm, 1219mm, 1250mm, 1500mm, 1524mm, 1800mm, and 2000mm, with custom slit-to-size available. Thickness range covers 0.3mm to 14mm for coil form and 0.3mm to 80mm for plate form, with 0.23mm as a standard gauge for transformer lamination applications.
Q: How do you ensure the magnetic properties match the M19 specification before shipment?
A: Our in-house laboratory tests every production batch for iron loss and magnetic polarization before the coil is released. The results are documented on the mill test certificate. Buyers may also request SGS or BV third-party inspection for independent verification.
Q: What is the packaging standard for ocean freight of CRGO coils?
A: Each coil is wrapped in waterproof paper with inner plastic film, placed on a metal pallet with angle bar edge protection, and secured with steel belt strapping. This packaging is designed to prevent moisture damage, edge deformation, and surface contamination during sea transit.
Get Your M19 CRGO Silicon Steel Coil Quotation With Mill Test Certificate
Send your specifications — grade, thickness, width, quantity, and destination — to receive factory-direct pricing and a sample MTC within one business day.
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