Description
Factory-direct M19 CRGO silicon steel coil supplier — every coil shipped with original mill test certificates documenting iron loss values and grain orientation consistency.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | M19 CRGO Silicon Steel Coil/Plate |
| Product Type | Silicon Steel Coil / Electrical Steel Plate |
| Steel Grade | M19 (CRGO – Cold Rolled Grain Oriented) |
| Technique | Cold Rolled |
| Thickness | 0.3–14mm (coil), 0.3–80mm (plate) |
| Width | 1000mm / 1219mm / 1250mm / 1500mm / 1524mm / 1800mm / 2000mm or custom |
| Surface | 2B / 2D / HL (Hairline) / BA (Bright Annealed) / No.4 / Colored mirror & brushed finishes |
| Application | Motors / Transformers / Generators |
| Packing | Waterproof paper + metal pallet + angle bar protection + steel belt |
| Container Loading | 20ft GP (~24–26CBM, 23MTS) / 40ft GP (~54CBM, 27MTS) / 40ft HG (~68CBM, 27MTS) |
| Trade Terms | EXW / FOB / CFR / CIF |
| Payment Terms | T/T / L/C or other |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Power & Energy | Transformer core lamination (power transformers, distribution transformers) |
| Industrial Manufacturing | Stator and rotor cores for electric motors and generators |
| Electrical Equipment | Magnetic core components for reactors, inductors, and electromagnetic assemblies |
| Infrastructure Projects | Electromagnetic shielding and specialty electrical enclosures |
Why Iron Loss Values Decide Whether Your Transformer Passes Efficiency Standards
M19 grade CRGO silicon steel is specified for its low core loss under alternating magnetic flux — but only if the grain orientation and thickness tolerance are consistent across every coil.
When procurement teams source M19 CRGO silicon steel coil for transformer or motor cores, the most common failure point is not the steel grade itself — it is the inconsistency between coils within the same shipment. One roll may test within M19 iron loss limits; the next may drift higher, causing the finished transformer core to exceed design loss thresholds. Third-party lab testing often reveals this gap only after the container has arrived, leaving buyers with air-freight replacement costs or heavy discount negotiations. [NEED_CITE: CRGO silicon steel iron loss testing standards and grain orientation measurement methods]
Matching M19 CRGO Silicon Steel Coil to Electromagnetic Core Requirements
The grain-oriented crystalline structure of M19 CRGO silicon steel coil aligns magnetic flux along the rolling direction, delivering significantly lower core loss compared to non-oriented grades. This makes it the default material choice for transformer cores where energy efficiency under continuous AC excitation is critical. For motor and generator applications requiring stamping in multiple directions, buyers must evaluate whether CRGO or non-oriented silicon steel better serves the flux path geometry. Our cold rolling process maintains tight thickness tolerance across the full coil width — a factor that directly affects lamination stacking factor and, ultimately, core performance.
Engineering Compliance and Certification for Electrical Steel Procurement
Electrical steel used in power transformers and industrial motors must meet traceability and performance documentation requirements that vary by destination market. For EU-bound shipments, CE marking and compliance with relevant EN standards for electrical steel are often required for project acceptance. [NEED_CITE: international standards for grain-oriented electrical steel used in transformer cores] Buyers procuring M19 CRGO silicon steel coil for infrastructure projects should verify that mill test certificates include iron loss values (P1.5/50 or P1.7/50), magnetic induction measurements, and chemical composition per heat number. Custom thickness and width specifications require clear communication of lamination design parameters to ensure the cold rolling process delivers material within the required electromagnetic performance envelope.
Understanding M19 Grade and Cold Rolled Grain Oriented Process
M19 is a high-permeability, low-loss grade within the CRGO silicon steel classification, where the “19” indicates the maximum specific total loss value. The cold rolling process for grain-oriented electrical steel involves multiple stages — hot rolling, normalizing, cold reduction, decarburization annealing, and high-temperature box annealing with a magnesium oxide coating — each designed to develop the Goss texture (110)[001] crystal orientation that gives CRGO its directional magnetic superiority. The insulation coating applied after final annealing serves dual purposes: it provides inter-lamination electrical resistance to reduce eddy current loss, and it protects the surface during handling and stamping. Thickness tolerance in the 0.3–0.35mm range is particularly critical, as even minor deviation affects the stacking factor and introduces air gaps in the laminated core.
The Hidden Cost of Inconsistent Grain Orientation in Bulk Orders
Ordering M19 CRGO silicon steel coil without verified mill test certificates for every roll creates downstream risk that far exceeds the initial price difference. Coils with degraded grain orientation will produce transformer cores with higher no-load loss, potentially failing type-test efficiency requirements under IEC or IEEE standards. [NEED_CITE: transformer core loss testing and efficiency class requirements] Thickness variation beyond acceptable tolerance forces stamping shops to adjust die clearances or reject laminations outright, generating scrap and delaying production schedules. Material mixed with non-oriented grades — whether through supplier error or substitution — will not deliver the directional magnetic properties specified, and this defect is invisible until electromagnetic testing is performed.
Procurement Confidence Through Direct Factory Control
As a factory-direct M19 CRGO silicon steel coil supplier operating three production lines with monthly capacity exceeding 20,000 tons, we eliminate the markup and material traceability gaps introduced by trading intermediaries. Every coil is produced under ISO 9001:2015 quality management, and original mill test certificates accompany each shipment — documenting chemical composition, iron loss values, magnetic induction, and thickness measurements by heat number. Our inventory covers 2,800+ specifications across steel product categories, enabling consolidated container loading when buyers need CRGO silicon steel alongside other electrical or structural steel materials. Third-party inspection through SGS or BV is available on request for buyers requiring independent verification before shipment. Professional export documentation handling ensures smooth customs clearance at destination ports across 50+ countries we regularly serve.
Documentation & Compliance
- Mill test certificate documenting M19 CRGO chemical composition, iron loss values (P1.5/50), and magnetic induction per heat number
- ISO 9001:2015 quality management certificate covering the full cold rolling and annealing production process
- SGS or BV third-party inspection report available for independent verification of electromagnetic properties and dimensional tolerance
- Material traceability by heat number from slab to finished coil, supporting project-specific quality audits
- Customs documentation package including commercial invoice, packing list, bill of lading, and certificate of origin
- CE certification documentation available for EU market compliance where applicable
Packaging, Loading & Delivery
- M19 CRGO silicon steel coil packed with waterproof paper inner layer, metal pallet base, angle bar edge protection, and steel belt strapping to prevent moisture ingress and edge damage during ocean transit
- Surface finish (2B/BA/HL) preserved through protective film or interleaving paper to maintain coating integrity for transformer lamination applications
- Container loading optimized for coil weight distribution — 20ft GP loaded to 23MTS, 40ft HG utilized for wider coils up to 2000mm width to maximize CBM utilization
- Custom cut-to-length plate orders (0.3–80mm thickness) bundled with wooden crating and separated by protective sheets to prevent surface scratching
- Heat number and steel grade clearly marked on each coil ID and outer packaging for on-site identification and traceability verification
- FOB, CFR, and CIF trade terms supported with professional export team handling booking, documentation, and container loading supervision
Getting Your M19 CRGO Silicon Steel Quote
Submit your specifications — thickness, width, quantity, surface finish, and destination port — and receive a competitive factory-direct quotation within 12 hours, complete with mill test certificate samples and delivery timeline. For non-standard thickness or width requirements, our engineering team will confirm feasibility and production lead time based on your lamination design parameters.
Request Factory-Direct Pricing with Mill Test Certificates
Send your M19 CRGO silicon steel coil requirements to admin@sdxinjiyuan.com or reach us via WhatsApp at +86 188 5315 7756.
Frequently Asked Questions
Q: What is M19 CRGO silicon steel and how does it differ from non-oriented electrical steel?
A: M19 is a cold rolled grain oriented (CRGO) silicon steel grade designed for applications where magnetic flux follows a predictable directional path, such as transformer cores. The grain orientation process aligns the crystal structure along the rolling direction, delivering lower iron loss and higher magnetic permeability in that direction compared to non-oriented grades, which are better suited for rotating machines where flux direction varies.
Q: Can you provide mill test certificates and third-party inspection for electromagnetic property verification?
A: Yes, every shipment of M19 CRGO silicon steel coil includes original mill test certificates documenting chemical composition, iron loss values, magnetic induction, and thickness measurements by heat number. SGS or BV third-party inspection is available on request for buyers requiring independent laboratory verification before shipment.
Q: What is the MOQ for custom thickness and width specifications?
A: We support flexible order quantities from trial orders starting at 1 ton up to full-container bulk shipments. Standard widths (1000mm–2000mm) and thicknesses (0.3–14mm coil, 0.3–80mm plate) are available from ready stock, while custom specifications typically require confirmation of production feasibility and lead time.
Q: How do you ensure grain orientation consistency across large-volume orders?
A: Grain orientation is developed during the high-temperature box annealing stage of the cold rolling process, which is controlled under our ISO 9001:2015 certified quality management system. Each coil is tested for iron loss and magnetic induction before shipment, and heat number traceability allows buyers to verify that all coils in a shipment originate from the same production batch with consistent processing parameters.
Q: What are the standard packing methods for ocean shipping of silicon steel coils?
A: M19 CRGO silicon steel coil is packed with waterproof paper inner protection, mounted on metal pallets, reinforced with angle bar edge protectors, and secured with steel belt strapping. This packaging method prevents moisture damage, edge deformation, and coil shift during ocean transit, and is standard for 20ft GP and 40ft GP/HG container loading.
Get Competitive Factory-Direct Pricing on M19 CRGO Silicon Steel
Email your specifications to admin@sdxinjiyuan.com or contact us at +86 188 5315 7756 to receive a detailed quotation with mill test certificate samples and confirmed delivery schedule.
