Electrical steel is different than cable and wires.

Electrical steel is speciality steel tailored to produce certain magnetic properties, such as small hysteresis area (which is a small energy dissipation per cycle, or low core loss) and high permeability. It is basically an iron-silicon alloy specially designed to produce positive magnetic properties like small hysteresis cycle, low core losses and high magnetic permeability. The silicon content ranges between 0.5% and 5%.

• There are two main kinds of electrical steel. The grain-oriented electrical steel (GOES) and non-grain oriented steel (NGOES).
• The grain-oriented electrical steel (GOES) contains around 3% silicon. While the non-grain oriented steel (NGOES) could have a wider range of silicon content and can be divided into three categories on the basis of composition and application which are as follows.
• Low silicon steel containing around 0.5% to 1.5% silicon. These type of steel are used in rotating machines, while steel containing around 1% silicon is also used in reactors and small transformers.
• Intermediate-silicon steel contains between 2.5% to 3.5% silicon and used in motors and generators of average to high efficiency. They can be used in small to medium size intermittent-duty transformers.
• High-silicon steel containing around 3.75% to 5% silicon. This type of steel is used in power transformers and the highest efficiency motors, generators etc.