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Cold-rolled non-oriented silicon steel (CRNGO) coil is a type of electrical steel that is widely used in various electrical and electronic devices. Unlike cold-rolled grain-oriented silicon steel (CRGO) which has a highly oriented grain structure, CRNGO steel is manufactured to have a non-oriented random grain structure.
Here are some key characteristics and features of CRNGO steel:
Non-Oriented Grain Structure: CRNGO steel is produced with a random orientation of grains, meaning that the crystallographic structure is not aligned in a specific direction. This random grain structure allows the material to exhibit uniform magnetic properties in all directions.
Low Core Losses: Like CRGO steel, CRNGO steel is designed to have low core losses. Core losses refer to the dissipation of energy that occurs within the core material when subjected to changing magnetic fields. By reducing core losses, CRNGO steel helps enhance the energy efficiency of electrical devices.
Electrical Resistivity: CRNGO steel possesses a relatively high electrical resistivity compared to other types of steel. This property helps minimize eddy current losses when the steel is used in transformers or other electromagnetic devices.
Suitable for High-Frequency Applications: CRNGO steel is commonly used in devices and equipment operating at higher frequencies, such as electric motors, generators, and various electrical appliances. Its magnetic properties make it suitable for applications where rapid magnetic field changes occur.
Versatile Applications: CRNGO steel is utilized in a wide range of electrical and electronic applications, including motors, generators, transformers, magnetic coils, solenoids, magnetic cores, magnetic chokes, and magnetic shielding.
Surface Insulation: CRNGO steel is often coated or treated with insulation to minimize eddy current losses that can occur along the steel surface. This insulation helps improve the overall performance and efficiency of electrical devices.
CRNGO steel offers a cost-effective alternative to CRGO steel in applications where a non-oriented magnetic behavior is required. Its properties make it suitable for a variety of electrical devices and systems that operate at different frequencies and require efficient energy conversion.
| Class | Nominal Thickness (mm) | Theoretical Density (kg/dm3) | Core Loss Value P15/50 (W/kg) | Specified Value of Magnetic Flux Density Peak Value B50 (T) | Specified Value of Stacking Coefficient |
| 35WW250 | 0.35 | 7.60 | 2.30 | 1.62 | 95.0 |
| 35WW270 | 7.65 | 2.50 | |||
| 35WW300 | 2.70 | – | |||
| 35WW360 | 3.00 | 1.63 | |||
| 35WW400 | 3.60 | 1.64 | |||
| 35WW440 | 7.7 | 4.00 | 1.65 | ||
| 50WW250 | 0.5 | 7.60 | 2.30 | 1.62 | 97.0 |
| 50WW270 | 2.50 | 1.65 | |||
| 50WW290 | 2.70 | 1.62 | |||
| 50WW310 | 7.65 | 2.90 | 1.62 | ||
| 50WW350 | 3.10 | 1.62 | |||
| 50WW400 | 3.50 | 1.63 | |||
| 50WW470 | 7.70 | 4.00 | 1.64 | ||
| 50WW600 | 0.5 | 7.75 | 4.70 | 1.66 | 97.0 |
| 50WW700 | 7.80 | 6.00 | 1.67 | ||
| 50WW800 | 7.00 | 1.68 | |||
| 50WW1000 | 7.85 | 8.00 | 1.70 | ||
| 50WW1300 | 10.00 | 1.72 |
Cold rolled non-oriented electrical silicon steel coils offer several advantages over hot rolled non-oriented silicon steel coils. Here are some of the key advantages:
1. Surface Quality and Insulation Performance
Cold-rolled non-oriented electrical silicon steel has a coating on the surface, providing good insulation performance. Its surface finish and flatness are better than hot-rolled silicon steel, which is uncoated and lacks the same surface quality.
2. Coil Material and Utilization
Cold-rolled non-oriented electrical silicon steel is available in an infinite length of coil material, while hot rolling produces flat plates. The comprehensive utilization of cold rolling is better than hot rolling, with the “same plate difference” in cold rolling being below 10, compared to hot rolling. Therefore, the quality of cold-rolled non-oriented electrical silicon steel is generally better than hot rolling.
3. Application in Electrical Devices
Cold rolled non grain oriented silicon steel coil (CRNGO) is a pivotal material in the electrical industry, used predominantly in the construction of transformers, motors, and generators. The material’s low iron loss and high magnetic sensitivity make it suitable for energy-efficient applications.
4. Reduced Energy Loss
The cold rolling process contributes to the steel’s smooth surface and uniform thickness, critical for minimizing energy loss. By using cold strips instead of hot rolled strips to manufacture motors or transformers, the weight and volume can be reduced by 0-25%. Additionally, if cold-rolled orientation strip is used, the power consumption of the transformer can be reduced by 45%-50% compared to using hot-rolled strips or low-grade cold-rolled strips.
Cold rolled non-oriented silicon steel coils find applications in various electrical and industrial fields due to their unique properties. Here are some of the key applications:
1. Electromotors and Generators:
Cold rolled non-oriented silicon steel coils are mainly used to produce electromotors and generators. These coils are integral in the manufacturing of energy-efficient transformers and large-scale power generators.
2. Transformers:
Non-oriented electrical steels, including cold rolled non-oriented silicon steel coils, are critical in the manufacturing of rotating machines of all sizes, as well as in small transformers and a variety of other electromagnetic applications. They are used for the cores of power and distribution transformers.
3. Electrical Industry:
Cold rolled non-oriented silicon steel coils are widely applicable to the motor industry. They are used in the construction of transformers, motors, and other electrical applications.
4. Other Industrial Applications:
These coils are also used in various industrial applications, such as in the manufacturing of steel products, structural steel, and building steel.
In summary, cold rolled non-oriented silicon steel coils are essential components in the electrical industry, playing a crucial role in the production of electromotors, generators, transformers, and various other industrial applications.
