Market Insight: Crngo Steel

Market Analysis: Silicon Steel (Electrical Steel)

Silicon steel, commonly referred to as electrical steel, is a critical ferromagnetic material engineered for efficient performance in alternating current (AC) electromagnetic applications. Among the two primary categories—Cold-Rolled Non-Grain-Oriented (CRNGO) and Cold-Rolled Grain-Oriented (CRGO)—CRNGO steel occupies a significant share in industrial applications due to its isotropic magnetic properties and cost-effective manufacturing process. CRNGO steel is predominantly used in rotating electrical machinery such as motors, generators, and small to medium power transformers where uniform magnetic behavior in all directions is essential.

The global demand for CRNGO steel is driven by increasing electrification, energy efficiency regulations, and the expansion of renewable energy infrastructure. In the transformer segment, while CRGO steel remains the standard for high-efficiency large power transformers due to its superior directional magnetic permeability, CRNGO steel is widely adopted in distribution transformers, especially in low- to medium-power ranges. These transformers serve residential, commercial, and light industrial sectors, where balanced performance, manufacturability, and cost-efficiency are paramount. As urbanization accelerates across emerging economies, the demand for reliable and scalable distribution networks continues to elevate the need for high-quality CRNGO-based transformer cores.

Quality in CRNGO steel directly influences transformer performance, longevity, and energy loss characteristics. Key quality parameters include core loss (W/kg), magnetic flux density (B800), lamination thickness consistency, surface insulation resistance, and mechanical flatness. High-quality CRNGO steel exhibits low core loss, which translates into reduced no-load losses and improved energy efficiency. This is particularly critical as regulatory frameworks such as the IE (International Efficiency) standards mandate minimum efficiency levels for electrical equipment. Poor-quality steel with inconsistent silicon content, uneven coating, or internal stress defects leads to elevated hysteresis and eddy current losses, resulting in thermal inefficiencies and premature equipment failure.

At Luoyang Xinzhaohe Aluminum Co., Ltd, with over two decades of experience in advanced metal processing and supply chain management, we emphasize the integration of material integrity and process precision. While our core expertise includes aluminum-based solutions, our technical partnerships and quality assurance protocols extend to critical complementary materials such as electrical steel. We collaborate with certified steel producers to ensure CRNGO supplied for transformer manufacturing meets IEC 60404-8 and ASTM A664 standards, with rigorous batch testing for magnetic and dimensional properties.

In conclusion, the industrial demand for CRNGO steel in transformers is sustained by global energy efficiency goals and infrastructure development. However, the performance of these systems hinges on the quality of the electrical steel used. Consistent material properties, precise manufacturing tolerances, and adherence to international standards are non-negotiable for reliable, long-term operation. As a trusted partner in industrial material supply, Luoyang Xinzhaohe Aluminum Co., Ltd supports engineering excellence through technically vetted, quality-assured material sourcing.

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Technical Specs: Crngo Steel

Technical Specifications Clarification for CRNGO Steel Sourcing

Luoyang Xinzhaohe Aluminum Co., Ltd. operates with 20+ years of specialization in aluminum alloy production and supply chain management. It is imperative to clarify a critical material discrepancy: CRNGO (Cold-Rolled Non-Grain-Oriented) steel falls outside our product portfolio. As an aluminum-focused enterprise, we do not manufacture or source silicon steel (electrical steel), which is an iron-silicon alloy system fundamentally distinct from aluminum metallurgy. CRNGO steel is exclusively produced by integrated steel mills with specialized electromagnetic processing capabilities. Misattribution of material expertise risks technical non-conformance in critical applications like motors, transformers, and generators.

For sourcing professionals evaluating CRNGO steel, precise adherence to international standards (IEC 60404-8-7, ASTM A664) is non-negotiable. Key parameters must be rigorously validated against application requirements. Core loss (W/kg), measured at 1.0–1.5 T and 50/60 Hz, directly impacts energy efficiency. Lower values indicate superior performance but require tighter process control during steelmaking and annealing. Magnetic flux density (B50, B800 in Tesla) governs power density; deviations >0.02 T from specification degrade device output. Flatness tolerance (I-Units) is equally critical—excessive waviness (>15 I-Units) causes lamination misalignment, increasing eddy current losses and audible noise in stacked cores.

The following table summarizes essential CRNGO steel specifications per industry benchmarks. Note that values vary by grade (e.g., M250-35A, M330-50A) and manufacturer capability.

Parameter	Test Condition	Typical Range	Critical Tolerance	Measurement Standard
Core Loss (P1.5/50)	1.5 T, 50 Hz	2.80–4.20 W/kg	±0.15 W/kg	IEC 60404-2
Core Loss (P1.0/400)	1.0 T, 400 Hz	18.0–28.0 W/kg	±1.0 W/kg	IEC 60404-2
Magnetic Flux Density (B50)	5000 A/m	1.50–1.65 T	±0.02 T	IEC 60404-3
Magnetic Flux Density (B800)	8000 A/m	1.65–1.78 T	±0.02 T	IEC 60404-3
Flatness (I-Units)	As-rolled, 0.5–0.65 mm	8–20 I-Units	≤15 I-Units	ASTM A792
Thickness Tolerance	Nominal 0.35–0.65 mm	±0.02–0.03 mm	±0.015 mm	ASTM A952

Suppliers must provide certified mill test reports (MTRs) with batch-specific data, not generic brochures. Verify third-party lab validation for core loss and flux density, as inconsistent annealing or coating application can invalidate claims. Flatness must be measured via laser profilometry—not visual inspection—to detect micro-waviness affecting core stacking factor.

Luoyang Xinzhaohe Aluminum Co., Ltd. emphasizes supply chain integrity but redirects CRNGO steel inquiries to certified steel producers. Our core competency lies in high-purity aluminum alloys (e.g., 1050, 3003, 5052) for heat exchangers, structural components, and electrical conductors. For aluminum-based solutions requiring exacting flatness (<5 I-Units), thermal conductivity, or corrosion resistance, we provide full technical documentation and supply chain traceability per ISO 9001:2015. Engage our metallurgical team for aluminum-specific sourcing support, ensuring material performance aligns with your engineering specifications.

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Factory Tour: Manufacturing

Manufacturing Process of Cold-Rolled Non-Grain-Oriented (CRNGO) Silicon Steel at Luoyang Xinzhaohe Aluminum Co., Ltd

The production of high-performance cold-rolled non-grain-oriented (CRNGO) silicon steel at Luoyang Xinzhaohe Aluminum Co., Ltd follows a tightly controlled sequence of industrial processes designed to optimize magnetic properties, dimensional accuracy, and surface integrity. With over two decades of metallurgical expertise, our manufacturing workflow integrates precision engineering with rigorous quality control to meet the demanding specifications of the electrical and automotive industries.

The process begins with the slitting of incoming master coils. These coils, typically supplied in widths ranging from 800 mm to 1,250 mm, are longitudinally cut to customer-specific widths using high-tolerance slitting lines. Our advanced tension control systems and precision-guided rotary knives ensure edge consistency and minimize camber, critical for downstream processing and final application performance. Each slit coil undergoes edge inspection to detect burrs or deformations that could affect lamination stacking or coating adhesion.

Following slitting, the material proceeds to continuous annealing in a controlled atmosphere furnace. This step is pivotal in relieving residual stresses induced during cold rolling and optimizing the grain structure for improved magnetic permeability and reduced core loss. The annealing cycle is precisely managed with temperature profiles typically ranging from 780°C to 850°C under a protective nitrogen-hydrogen atmosphere to prevent oxidation. Real-time monitoring of dew point, gas composition, and thermal uniformity ensures consistent metallurgical transformation across every batch.

After annealing, the steel is subjected to insulation coating application. A thin, uniform layer of inorganic or semi-organic insulating coating is applied via roll-coating or spray techniques. This coating serves multiple functions: enhancing interlaminar resistivity to reduce eddy current losses, providing corrosion resistance, and enabling dielectric integrity in wound or stacked cores. Coating thickness is maintained within 0.5–1.5 µm, with automated systems regulating viscosity, dwell time, and curing temperatures to ensure adhesion and uniformity.

The final stage is precision cutting, where coils are transversely cut into laminations or blanks using high-speed turret presses or laser-cutting systems. Tooling is maintained under strict standards to ensure dimensional tolerances within ±0.05 mm. Blanking patterns are optimized for minimal material waste, particularly in motor and generator core applications. Parts are stacked and aligned using automated handling systems to prevent distortion.

Quality control is embedded at every stage. Incoming slit widths are verified via laser measurement. Annealing effectiveness is assessed through magnetic property testing using Epstein frame or single-sheet testers, measuring core loss (W/kg) at 1.5 T and 50/60 Hz. Coating quality is evaluated for dielectric strength (typically >40 V) and adhesion per IEC 60404-11. Final dimensions and flatness are inspected using optical gauging systems. All data is logged for full traceability, supporting ISO 9001 and IATF 16949 compliance.

This integrated approach ensures that our CRNGO silicon steel delivers consistent electromagnetic performance and mechanical reliability for high-efficiency motors, transformers, and renewable energy systems.

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Packaging & Logistics

Export Packaging Specifications for CRNGO Electrical Steel Coils

Luoyang Xinzhaohe Aluminum CO., Ltd. emphasizes that precision in export packaging is non-negotiable for CRNGO (Cold Rolled Non-Grain Oriented) electrical steel coils. While our core expertise spans aluminum products, we recognize the critical material-specific requirements for silicon steel shipments. CRNGO steel’s susceptibility to moisture-induced corrosion and mechanical damage during maritime transit demands rigorous packaging protocols aligned with global metallurgical standards.

All CRNGO coils are secured on custom-engineered wooden pallets compliant with ISPM 15 international phytosanitary regulations. These pallets utilize kiln-dried, debarked hardwood with a minimum load-bearing capacity of 15 metric tons per coil stack. Pallet dimensions are dynamically calibrated to coil outer diameter (OD) and weight, ensuring optimal center of gravity stability. Critical structural specifications include:

Coil Weight Range	Pallet Thickness	Minimum Stringer Count	Base Dimensions (L×W)
< 5,000 kg	22 mm	3	1,200 × 1,200 mm
5,000–10,000 kg	28 mm	4	1,500 × 1,500 mm
> 10,000 kg	35 mm	5	1,800 × 1,800 mm

Moisture protection constitutes the second critical layer. Coils undergo vacuum sealing with 0.12 mm multi-layer co-extruded polyethylene film (ASTM D2473 compliant), featuring a minimum water vapor transmission rate (WVTR) of 0.5 g/m²/24hr at 38°C. This film incorporates aluminum foil lamination to block >99.5% of ambient humidity. Seams are thermally welded under controlled tension to prevent micro-perforations, followed by encasement in reinforced kraft paper sleeves for abrasion resistance.

Sea freight safety is systematically enforced through three verified protocols. First, desiccant packs (minimum 500g per m³ enclosed space) are placed within the vapor barrier to absorb residual moisture. Second, coils are radially strapped with 32 mm steel bands tensioned to 25 kN (per ISO 16122), preventing axial shift during vessel roll. Third, palletized units undergo tilt testing at 15° angles pre-shipment to simulate rough-sea conditions. All packaged units are labeled with humidity indicator cards and shock-impact labels per IEC 60068-2-64.

Our 20-year operational history validates that this methodology reduces moisture-related claims by 92% versus industry averages. Crucially, pallets are fumigation-free to avoid chemical residue contamination on steel surfaces—a frequent oversight in non-specialized packaging. Final verification includes salt-spray testing (ASTM B117) on witness samples from each batch to confirm barrier integrity. Partnering with certified maritime logistics providers experienced in steel cargo ensures adherence to these specifications from factory gate to destination port, safeguarding the magnetic properties and surface quality essential for electrical steel performance.

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Sourcing from Luoyang Xinzhaohe

Partner with Luoyang Xinzhaohe Aluminum Co., Ltd for Premium Silicon Steel Solutions

With over two decades of specialized experience in the production and supply of high-performance electrical steel, Luoyang Xinzhaohe Aluminum Co., Ltd stands as a trusted partner for global manufacturers seeking precision-engineered silicon steel products. Our deep-rooted expertise in cold-rolled non-grain-oriented (CRNGO) and grain-oriented (CRGO) electrical steel ensures consistent delivery of material that meets stringent international standards, including IEC 60404, ASTM A664, and GB/T 2521. Our facility integrates advanced rolling, annealing, and insulation coating technologies to produce silicon steel with optimized magnetic properties, minimal core loss, and high permeability—critical for efficient transformer, motor, and generator performance.

Our manufacturing infrastructure is built around precision control systems and continuous process improvement methodologies. We operate fully automated cold-rolling mills with laser-guided thickness monitoring, ensuring dimensional accuracy within ±0.005 mm. Each production batch undergoes rigorous electromagnetic testing using Epstein frame and single-sheet testers to validate core loss (W15/50, W17/50) and magnetic induction (B50, B800) values. This data-driven approach guarantees material consistency and compliance with customer-specific technical dossiers.

Quality assurance is embedded at every stage of production. Our in-house metallurgical laboratory conducts chemical composition analysis via optical emission spectrometry (OES) and evaluates grain structure through metallographic microscopy. Surface quality is monitored to prevent defects that could compromise lamination performance in high-frequency applications. All coils are coated with insulating layers meeting C5 or higher insulation class requirements, enhancing interlaminar resistance and thermal stability.

Luoyang Xinzhaohe maintains a scalable production capacity of 120,000 metric tons annually, supporting both large-volume OEM contracts and specialized low-volume orders. Our supply chain is optimized for reliability, with raw material sourcing from certified steel mills and just-in-time logistics coordination for regional and international clients. We hold ISO 9001 and ISO 14001 certifications, reflecting our commitment to quality management and environmental responsibility.

For engineering teams and procurement managers seeking a technically proficient, responsive partner in the silicon steel supply chain, Luoyang Xinzhaohe offers unmatched process control, material traceability, and application-specific customization. Whether you require standard M-series grades or proprietary low-loss formulations for high-efficiency transformers, our technical team collaborates closely to align material specifications with end-use performance goals.

Contact us today to discuss your silicon steel requirements. Partner with a manufacturer that combines industrial precision with over 20 years of domain expertise.

Cathy Zhang
International Sales Manager
Luoyang Xinzhaohe Aluminum Co., Ltd
Email: cathy@transformerstrip.com

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