Table of content
Introduction
Electrical steel, sometimes called silicon steel, is an important application in the operation of equipment that converts electricity into kinetic energy or kinetic energy into electrical energy. It is mainly used in transformers, motors or generators. This article will give a detailed introduction to electrical steel, including the meaning, performance, uses and whether electrical steel is special. In which products can it be used?
What is Electrical Steel?
Electrical steel is a special alloy containing silicon and iron elements. It can enhance magnetism and reduce energy loss when used in electrical equipment. Electrical steel has high magnetic permeability, low iron loss and minimal hysteresis, which are all required characteristics in transformers, motors or generators.
What is the Difference Between Electrical Steel and Normal Steel?
There is no obvious difference between the two in appearance, but their performance is different. The resulting applications are also different.
| Feature | Electrical Steel | Normal (Structural) Steel |
|---|---|---|
| Silicon Content | 1–6% | <0.1% |
| Magnetic Properties | High permeability, low loss | Not optimized for magnetism |
| Use | Transformers, motors | Beams, pipes, buildings |
| Resistivity | High | Lower |
| Processing | Precision rolled & annealed | Hot/cold rolled for strength |
In summary, electrical steel is mostly used in equipment that relies on magnetic power for electrical energy, not in buildings or pipelines.
What is Electrical Steel Used For?
Electrical steel is a steel material required in almost all electromagnetic equipment.
Common Applications:
- Transformers
- Electric motors (fans, air conditioners, etc.)
- Generators
- Inductors, magnetic coils
- Relays, sensors
Electrical steel plays a vital role in modern power infrastructure. It can be said that without electrical steel, power facilities may not be able to operate normally, especially in long distances or high power situations.
What Are the Examples of Electrical Steel?
Electrical steel is mainly divided into the following two categories:
1. Oriented electrical steel (GOES)
- Crystal structure arranged in a single direction
- Optimizes the directional magnetic flow
- Mainly used in power and transformers
2. Non-oriented electrical steel (NGOES)
- Crystal orientation is random
- Performance is very stable in all directions
- Mostly used in rotating machinery, such as motors and generators
What is Electrical Steel Made Of?
The main components of electrical steel are iron and silicon, but the silicon content is relatively low, usually around 1-6%. The content of silicon increases the material’s ability to transmit magnetic flux and reduces energy loss.
Additional Elements May Include:
- Aluminum: Main function is to refine grains
- Manganese: Main function is to improve strength
- Phosphorus or sulfur (trace): Main function is to control grain boundaries
These elements are added after strict proportions and strict production processes. That is, cold rolling, annealing and coating, etc., which ultimately make electrical steel magnetic.
Why is Silicon So Important?
The main function of silicon is to reduce the two energy losses of electromagnetic steel.
1. Hysteresis loss: Energy loss when the material is magnetized and demagnetized.
2. Eddy current loss: Circulating current inside the metal wastes energy.
Laminated Steel Sheets: A Key Design Feature
Laminated sheets are electrical steel sheets because electrical steel is usually not very thick and needs to be processed into very thin laminates and coated with an insulating layer.
Why Lamination?
Lamination can reduce eddy currents, improve efficiency and minimize heat generation in electrical steel.
How is Electrical Steel Processed?
The production of electrical steel includes: precision rolling, annealing, laser scribing (in GOES), and the specific production steps are as follows:
1. First cold-roll the hot-rolled steel to make its surface smoother and thinner.
2. Anneal to release stress and adjust grain orientation.
3. Coating treatment, electrical insulation between layers.
4. Cut or stamp to make the required core shape (mostly used in motors or transformers).
Strict control of production steps can well maintain the magnetic properties of the material.
Electrical Steel Grade Chart (Overview)
| Grade | Type | Description | Common Use |
|---|---|---|---|
| M-15 to M-47 | NGO | Non-grain-oriented motor steels | Electric motors, generators |
| B23R080 | GO | Grain-oriented steel | Power transformers |
| 35W300 | NGO | High efficiency, low loss | EV motors, appliances |
| 23ZH90 | GO | Ultra-thin transformer lamination | Smart grid transformers |
Electrical steel has grade codes according to different manufacturers. Be sure to refer to the material specification chart when purchasing.
Is Electrical Steel Expensive?
Yes, the price of electrical steel is relatively high.
Because:
The processing technology is more complicated
The addition of silicon element
Strict quality control
Typical Price Range:
The reference price is: US$2.00-4.00/kg, which varies according to different grades and coatings, and market industry prices.
Among them, the special grades used for electric vehicles or ultra-low loss transformers will have a higher price.
Summary
Electrical steel is a special material designed for use in equipment that converts electrical energy into energy or kinetic energy into electrical energy. Therefore, although it is not as widely used as ordinary steel, it is also crucial in the electrical industry and is the core.
In a nutshell:
- The silicon element in it can reduce energy loss.
- There are two types of silicon: oriented silicon and non-oriented silicon.
- It is mostly used in transformers, motors and generators.
- It needs to be processed into thin laminated insulation boards to improve efficiency.
This is the end of the introduction of electrical steel. I hope it will help you understand this material.
