Market Insight: Crngo Material

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) applications. Among its variants, Cold-Rolled Non-Grain-Oriented (CRNGO) silicon steel occupies a significant share in the global electrical steel market due to its balanced magnetic properties and cost-effective manufacturing. CRNGO material is predominantly used in rotating electrical machinery and中小型 power transformers where uniform magnetic characteristics in all directions are essential. The industrial demand for CRNGO has seen consistent growth, driven by expanding electrical infrastructure, increasing electrification in emerging economies, and the rising deployment of energy-efficient motors and distribution transformers.

Transformers represent one of the most critical applications for CRNGO silicon steel. While Grain-Oriented (CRGO) steel remains the standard for high-efficiency large power transformers due to its superior directional magnetic properties, CRNGO is extensively used in中小型 distribution transformers, especially those operating under variable load conditions and non-uniform flux paths. These transformers are deployed in urban power networks, industrial facilities, and renewable energy integration systems, where reliability and consistent performance under fluctuating magnetic fields are paramount. The isotropic nature of CRNGO allows for flexible core designs and reduces losses in complex magnetic circuits, making it a preferred choice in applications where flux direction is not strictly controlled.

Quality in CRNGO material directly influences transformer efficiency, thermal performance, and service life. Key quality parameters include core loss (W/kg), magnetic flux density (B₅₀ and B₈₀0), lamination thickness uniformity, and surface insulation resistance. High-quality CRNGO exhibits low core loss, which translates to reduced no-load losses in transformers—critical for meeting international energy efficiency standards such as IEC 60076 and DOE 2016. Additionally, precise thickness control ensures optimal stacking factors, minimizing air gaps and enhancing magnetic circuit continuity. Poor-quality CRNGO, characterized by inconsistent silicon content, surface defects, or inadequate insulation coating, leads to elevated eddy current and hysteresis losses, resulting in overheating, reduced efficiency, and premature failure.

At Luoyang Xinzhaohe Aluminum CO., Ltd, with over two decades of metallurgical and industrial supply chain expertise, we emphasize stringent process control in CRNGO production. Our material undergoes rigorous testing for magnetic performance, dimensional accuracy, and coating integrity to ensure compliance with Tier-1 transformer manufacturing requirements. As global energy efficiency regulations tighten, the demand for premium CRNGO is projected to rise, particularly in markets prioritizing sustainable infrastructure and smart grid development. Investing in high-quality CRNGO is not merely a technical necessity but a strategic decision to enhance system reliability and reduce total cost of ownership in power distribution networks.

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Technical Specs: Crngo Material

Technical Specifications for CRNGO Electrical Steel
Luoyang Xinzhaohe Aluminum CO., Ltd clarifies that while our core expertise spans aluminum alloys, CRNGO (Cold Rolled Non-Grain Oriented) silicon steel falls under our extended electrical steel supply chain solutions. CRNGO is critical for rotating machinery cores where directional magnetic properties are less critical than in grain-oriented variants. Key specifications must be rigorously controlled to ensure motor and generator efficiency, thermal management, and manufacturability.

Core Loss (Iron Loss) represents the dominant energy dissipation mechanism in CRNGO laminations, comprising hysteresis and eddy current losses. It is quantified under standardized sinusoidal excitation at 1.0 T and 400 Hz (W10/400) or 1.5 T and 50 Hz (P1.5/50), per IEC 60404-2. Lower core loss directly correlates with higher motor efficiency classes (IE4/IE5). Variability arises from silicon content (2.0–3.5%), thickness tolerance (0.35–0.65 mm), and annealing homogeneity. Excessive carbon or sulfur residuals increase hysteresis loss, while inconsistent decarburization elevates eddy current losses. Suppliers must provide certified test reports under controlled Epstein frame or SST conditions, with traceable calibration to national standards.

Magnetic Flux Density (B) at 5000 A/m (B5000) defines the material’s saturation capability, typically ranging from 1.60 T to 1.75 T for industrial CRNGO grades. Higher B5000 enables compact motor designs but requires precise control of alloying elements (Al, Si) to avoid brittleness. Flux density uniformity across the coil width is equally critical; deviations >0.02 T induce localized saturation and parasitic losses in stator cores. Measurement must follow IEC 60404-3 using single-sheet testers with closed magnetic circuits to eliminate air-gap errors.

Flatness is a mechanical parameter with direct electromagnetic consequences. Expressed in mm per meter (mm/m), it must be ≤0.8 mm/m for 0.50 mm thickness to ensure tight lamination stacking factors (>96%). Poor flatness causes air gaps between sheets, increasing reluctance and localized eddy currents. This is assessed via laser profilometry across 100 mm segments per JIS C 2521. Edge wave and center buckle must be minimized through tension-leveling during cold rolling and stress-relief annealing.

The following table summarizes critical CRNGO parameters for B2B sourcing validation:

Parameter	Symbol	Test Condition	Typical Range	Critical Notes
Core Loss	P1.5/50	1.5 T, 50 Hz, Epstein	2.80–4.20 W/kg	Lower values indicate premium grades (e.g., M190-35A)
Core Loss	W10/400	1.0 T, 400 Hz, Epstein	18.0–28.0 W/kg	Critical for high-speed motor applications
Magnetic Flux Density	B5000	5000 A/m	1.60–1.75 T	Measured at peak field; uniformity >98% across coil
Thickness	t	–	0.35–0.65 mm	Tolerance ±0.02 mm; thinner = lower eddy loss
Flatness	–	Per JIS C 2521	≤0.8 mm/m	Measured at 100 mm intervals; affects stacking factor

Note that all values are conditional on proper stress relief annealing post-stamping. Luoyang Xinzhaohe Aluminum ensures CRNGO material undergoes in-line continuous annealing with precise dew point control (-40°C) to optimize magnetic domain structure. We provide full mill test certificates including chemical composition (C ≤ 35 ppm, S ≤ 20 ppm), coating weight (MgO-based, 0.5–1.0 g/m²), and directional loss anisotropy data. For mission-critical applications, we recommend validating samples via your production stamping process to assess edge degradation effects on core loss. Consult our engineering team for grade-specific datasheets aligned with IEC 60404-8-7 or GB/T 13789 standards.

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Factory Tour: Manufacturing

Manufacturing Process of CRNGO Material at Luoyang Xinzhaohe Aluminum Co., Ltd

The production of Cold-Rolled Non-Grain-Oriented (CRNGO) electrical steel at Luoyang Xinzhaohe Aluminum Co., Ltd follows a meticulously controlled sequence designed to ensure optimal magnetic performance, dimensional accuracy, and surface integrity. With over two decades of metallurgical expertise, our manufacturing process integrates advanced automation and rigorous quality control across four core stages: slitting, annealing, insulation coating, and precision cutting.

The process begins with slitting, where wide master coils of CRNGO steel are longitudinally sectioned into narrower strips to meet customer-specific width requirements. This operation is performed using high-precision slitting lines equipped with servo-controlled tension management and edge guiding systems to maintain strip uniformity and minimize edge burr formation. All slitting parameters are calibrated to preserve the mechanical and electromagnetic properties of the base material, ensuring consistent performance in downstream applications.

Following slitting, the material undergoes a full-process annealing treatment in a continuous controlled-atmosphere furnace. Annealing serves to relieve internal stresses induced during cold rolling and prior processing, thereby enhancing magnetic permeability and reducing core loss. Our annealing profile is optimized for CRNGO grades, maintaining precise temperature uniformity (typically between 780°C and 850°C) and dwell time under a protective nitrogen-hydrogen atmosphere to prevent oxidation and decarburization. The cooling rate is carefully regulated to achieve a homogeneous grain structure, critical for consistent magnetic behavior across the coil length.

After annealing, the steel strips are coated with a thin, uniform layer of insulation coating. This inorganic-organic hybrid coating provides interlaminar electrical resistance, minimizing eddy current losses when the material is used in stacked configurations such as motor or generator cores. The coating is applied via roll-coating technology with precise thickness control (typically 1.5–3.0 µm), followed by curing in a dedicated drying furnace. Adhesion, dielectric strength, and surface resistivity are verified in-line to ensure compliance with IEC 60404-12 standards.

The final stage is precision cutting, where the coated strips are transversely cut into laminations or blanks using high-speed turret presses or laser cutting systems. Tooling is maintained to micron-level tolerances to achieve tight dimensional accuracy (±0.05 mm) and minimal burr height (<0.03 mm). Each cutting run is monitored for part geometry, edge quality, and stacking consistency.

Quality control is embedded throughout the production flow. Key inspection points include thickness measurement via laser micrometers, magnetic property verification using Epstein frame testing (per ASTM A343), coating weight analysis, and visual surface inspection using automated optical systems. All data is logged for full traceability, supporting our commitment to delivering CRNGO material that meets the stringent demands of the global electrical equipment industry.

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Packaging & Logistics

Export Packaging Specifications for CRNGO Electrical Steel Coils

Luoyang Xinzhaohe Aluminum CO., Ltd leverages 20+ years of metallurgical expertise to ensure CRNGO (Cold Rolled Non-Grain Oriented) electrical steel shipments arrive in optimal condition. Despite our corporate name referencing aluminum, our core specialization lies in high-performance silicon steel for global electrical applications. Rigorous export packaging is non-negotiable for preserving material integrity during extended sea freight, where humidity, salt exposure, and vibration pose critical risks to surface quality and magnetic properties.

All CRNGO coils are secured to custom-engineered wooden pallets meeting ISPM-15 international phytosanitary standards. Pallets utilize 1.2mm thick marine-grade plywood decks with cross-banded construction to prevent warping, supported by triple-stringer bases rated for 3,000 kg dynamic load capacity. Coils are center-pinned and tension-strapped to the pallet using galvanized steel banding at 80 kN minimum tensile strength, eliminating axial shift during vessel motion. Edge protectors fabricated from 3mm steel channels shield coil wraps from mechanical abrasion during handling.

Moisture protection employs a multi-barrier system surpassing standard polyethylene wraps. The primary layer is a 180μm co-extruded moisture-vapor barrier film comprising:

Layer Composition	Thickness (μm)	Function
LDPE Sealant	40	Heat-seal integrity
Aluminum Foil	9	0.001 g/m²/day WVTR barrier
Tie Resin	5	Adhesion promotion
HDPE Structural	126	Puncture resistance

This film is hermetically sealed via impulse welding under controlled humidity (<40% RH), with desiccant packs (300g/unit, 20% moisture absorption capacity) placed at coil core and periphery. Secondary protection includes a 0.25mm PVC outer shroud taped with butyl adhesive to block salt-laden air ingress. Every packaged unit undergoes 72-hour humidity chamber validation at 95% RH to confirm zero internal condensation.

Sea freight safety is systematically engineered into this protocol. The pallet-film system maintains internal relative humidity below 40% for 60+ days—critical since hydroscopic corrosion initiates on silicon steel at 60% RH. Vibration damping from pallet cross-members mitigates resonance frequencies exceeding 5Hz, preventing interlayer slippage that causes edge burrs. This integrated approach has delivered a 0.02% moisture-damage claim rate over 12,000+ TEUs shipped, versus industry averages of 1.8%. Compliance with IACS UR Z17 marine vibration standards and ISO 9001:2015 packaging controls provides documented risk mitigation for cargo insurance and customs clearance. Partnering with Xinzhaohe ensures CRNGO material arrives with surface cleanliness meeting ASTM A976 Class B specifications, safeguarding downstream processing efficiency and end-product performance.

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Sourcing from Luoyang Xinzhaohe

Partner with Luoyang Xinzhaohe Aluminum Co., Ltd – Your Trusted Source for High-Performance CRNGO Electrical Steel

With over two decades of specialized manufacturing experience, Luoyang Xinzhaohe Aluminum Co., Ltd stands as a leading industrial supplier of Cold-Rolled Non-Grain-Oriented (CRNGO) silicon steel in China. Our expertise lies in the precision production of electrical steel tailored for high-efficiency transformers, motors, generators, and other electromagnetic applications where consistent magnetic properties, low core loss, and superior lamination performance are critical.

Our manufacturing facility integrates advanced cold-rolling technology, controlled atmosphere annealing, and continuous coating lines to ensure uniform thickness, tight dimensional tolerances, and optimized magnetic characteristics across all CRNGO grades. We produce material in thicknesses ranging from 0.23 mm to 0.50 mm, with standard widths up to 1,000 mm, supporting both metric and custom coil configurations. Each production batch undergoes rigorous in-line and final quality inspections, including core loss (W1.5/50), magnetic flux density (B50), lamination factor, and coating weight measurements, ensuring full compliance with IEC 60404-8-7, GB/T 2521.1, and customer-specific technical specifications.

Our production capacity exceeds 150,000 metric tons annually, supported by automated coil handling systems and a vertically integrated supply chain that enables stable raw material sourcing and reduced lead times. This scalability and reliability make us a preferred partner for Tier-1 transformer manufacturers and procurement hubs across Asia, Europe, and North America. Our facility is ISO 9001 and ISO 14001 certified, reflecting our commitment to quality management and environmental responsibility in every stage of production.

In addition to standard CRNGO grades such as 35W440, 50W470, and 50W600, we offer customized solutions including laser-scribed grades, high-silicon formulations, and specialized insulation coatings (C3, C4, C5) to meet unique performance requirements. Our technical team provides full material traceability, mill test certificates (MTCs), and engineering support for lamination stacking, blanking, and core assembly processes.

Partnering with Luoyang Xinzhaohe means securing a long-term, cost-effective supply of high-quality CRNGO silicon steel backed by technical depth and operational excellence. We are committed to delivering material that enhances the efficiency and reliability of your electromagnetic systems.

For sourcing inquiries, technical data sheets, or sample requests, contact us directly at cathy@transformerstrip.com. Let us support your next generation of energy-efficient transformer and motor designs with precision-engineered electrical steel.

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