In the selection of core materials for motors, transformers, and various electromagnetic equipment, 50WW470 and 50WW600 are two common non-oriented silicon steel grades. Both belong to the 0.5mm thickness, fully-processed cold-rolled non-oriented electrical steel category. However, the numbers "470" and "600" in their designations directly reflect differences in core loss performance—a distinction that determines their divergent paths in terms of energy efficiency positioning, application scenarios, and overall cost.

This article provides a systematic comparison of these two products across five dimensions: grade designation interpretation, performance parameters, typical applications, cost differences, and selection recommendations, serving as a reference for downstream manufacturers in their material selection decisions.

Grade Designation Interpretation

The naming of both grades follows Chinese national standards (GB/T 2521) and industry conventions:

In these designations, "50" represents the nominal thickness of 0.50mm, "WW" indicates non-oriented electrical steel (Wuhan Iron and Steel/Baowu coding identifier; in national standards, it is typically abbreviated as 50W470/50W600), and the number represents the core loss value P1.5/50 (100 times the core loss per unit weight at a frequency of 50Hz and magnetic flux density of 1.5T).

Performance Parameter Comparison

1. Core Loss (P1.5/50)

Core loss is a core indicator for evaluating silicon steel sheet quality, directly relating to energy loss and heat generation during motor operation. The guaranteed core loss of 50WW470 is ≤4.70 W/kg, while that of 50WW600 is ≤6.00 W/kg. Under the same operating conditions, motor cores manufactured with 50WW470 generate less heat and achieve higher efficiency, whereas 50WW600 results in relatively higher energy consumption.

2. Magnetic Flux Density (B50)

Magnetic flux density determines the magnetic flux a material can generate under a given excitation current, directly impacting the motor's torque density and power output. 50WW470 typically achieves a B50 of 1.72T–1.74T, while 50WW600 generally reaches ≥1.66T. 50WW470 also demonstrates a significant advantage in magnetic flux density, contributing to higher power density within the same volume.

3. Lamination Factor

Both 50WW470 and 50WW600 have lamination factors above 95%, but higher-grade products impose stricter controls on surface flatness and thickness tolerances, resulting in a slightly superior lamination factor.

4. Processability

Both grades exhibit excellent stamping processability and are coated with semi-organic insulating coatings that effectively suppress interlaminar eddy current losses and provide rust protection, making them suitable for high-speed press mass production.

Core Performance Comparison Overview:

Typical Application Scenario Comparison

Each grade has its own "main battlefield" where it excels. The key to selection lies in balancing performance requirements and cost budgets.

Typical Applications of 50WW470:

As a mid-grade non-oriented silicon steel, 50WW470's lower core loss and higher magnetic flux density make it the preferred material for mid-to-high-end motors and compressors, including:

• High-Efficiency Motors: Suitable for YE3/YE4 and other high-efficiency and ultra-high-efficiency motors, meeting increasingly stringent motor energy efficiency standards.

• Inverter Compressors: Used in variable-frequency home appliances such as refrigerator compressors and air conditioner compressors, maintaining low losses even under high-frequency operating conditions.

• New Energy Vehicle Drive Motors: In the space- and weight-constrained drive motors of electric vehicles, its high magnetic flux density characteristic helps enhance power density.

• Industrial Servo Motors: Precision drive equipment with high requirements for dynamic response and efficiency.

• Small and Medium-Sized Generators: Applications pursuing higher power generation efficiency.

Typical Applications of 50WW600:

As a mid-low grade non-oriented silicon steel, 50WW600 occupies a significant position in cost-sensitive applications due to its balanced performance and lower material cost:

• Small and Medium-Sized Industrial Motors: Widely used in industrial drive equipment such as fans, pumps, and compressors, with comprehensive requirements for performance, cost, and efficiency.

• Home Appliance Motors: Compressor motors for appliances such as air conditioners, washing machines, and refrigerators, with B50 reaching 1.70T–1.75T.

• Micro-Motors and Small Appliances: Desktop fans, exhaust fans, range hood auxiliary motors, toy motors, and other low-power, cost-sensitive equipment.

• Power Tools: Small motors in handheld drills, angle grinders, and similar tools.

• General Industrial Transformers: Cores for small and medium-sized transformers with certain core loss control requirements but without pursuit of ultimate energy efficiency.

Cost Difference Analysis

Material cost is an important factor in the selection decision. As a mid-grade product, 50WW470 has higher manufacturing costs than 50WW600, resulting in a notable price difference between the two.

In terms of market pricing, 50WW470 is approximately 200–500 RMB per ton higher than 50WW600, with the exact difference varying with market supply and demand fluctuations. When selecting materials, companies should consider both the initial material cost and the operating costs over the equipment's entire lifecycle: although 50WW470 has a higher purchase price, its lower core loss translates to lower electricity expenses during long-term equipment operation; 50WW600 has a lower initial investment but may incur higher operating costs in applications with stringent energy efficiency requirements.

Selection Recommendations: How to Make the Right Choice?

There is no absolute "good" or "bad" in the selection of non-oriented silicon steel—the key lies in "suitability." The following provides a reference for selection decisions:

A critical point worth special attention: With the continuous upgrading of global motor energy efficiency standards (such as China's GB 18613-2020 and EU IE standards), 50WW600 is increasingly less used in newly built high-efficiency motor projects. Its applications are gradually concentrating in areas with less demanding energy efficiency requirements, such as micro-motors and small appliances. Therefore, manufacturers with long-term development plans should fully consider the evolutionary trends of future energy efficiency standards when selecting materials, to avoid the risk of product obsolescence due to choosing lower-grade materials.

As two non-oriented silicon steel products with different positioning, 50WW470 and 50WW600 each deliver their respective value in high-performance and cost-effective applications respectively. For mid-to-high-end equipment pursuing higher energy efficiency and superior electromagnetic performance, 50WW470 is the more ideal choice. For general applications where cost is the priority, 50WW600 remains competitive.

Shanghai Ruichao Industrial Co., Ltd.: Your Professional Electrical Steel Partner

Shanghai Ruichao Industrial Co., Ltd. has long been dedicated to the supply of non-oriented and grain-oriented electrical steel. Our product portfolio covers a full range of non-oriented silicon steel grades including 50WW470, 50WW600, 50WW800, and 50WW1300, as well as high magnetic flux density, low core loss grain-oriented electrical steel products.

We Offer You:

• Stable Supply: Long-term strategic partnerships with major domestic steel mills like Baowu Group, ensuring consistent and reliable product quality.

• Precision Processing: Advanced slitting, leveling, and blanking processing equipment to meet diverse customer requirements for dimensions and specifications.

• Technical Support: Professional team providing material selection consultation, performance comparison analysis, and iron core design optimization recommendations.

• Flexible Delivery: Comprehensive warehousing and logistics systems supporting batch-based supply on demand, reducing customer inventory pressure.

Whether you are a transformer manufacturer, a high-efficiency motor producer, or a supplier of drive motors for new energy vehicles, Shanghai Ruichao Industrial Co., Ltd. is committed to leveraging our professional material supply capabilities to help you secure the energy efficiency high ground in the fiercely competitive market.