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The density of aço ao silício generally ranges from 7.65 to 7.75 g/cm³, with the exact value determined by silicon content and manufacturing processes.

I. Standard Density Values of Silicon Steel

Silicon content is the dominant factor governing aço ao silício density. Silicon has a lower atomic mass than iron, so density decreases slightly as silicon content rises. For conventional non-oriented aço ao silício with 1%–3.5% silicon, its density fluctuates within the 7.65–7.75 g/cm³ range.

It should be noted that this range is only empirical. Actual density is also affected by the content of other alloying elements and impurities.

Processing technology creates minor density variations. Cold-rolled silicon steel features more consistent grain orientation, resulting in a density 0.01–0.02 g/cm³ higher than hot-rolled silicon steel. This discrepancy is usually negligible for most practical applications, except for special scenarios with ultra-high magnetic performance requirements.

II. Application and Material Selection of Silicon Steel

Silicon steel is primarily used to fabricate iron cores for transformers and motors. Although density affects material weight and volume, magnetic indicators such as magnetic permeability and core loss take higher priority during grade selection.

For weight-sensitive applications, high-silicon silicon steel is an option; it delivers superior magnetic performance despite marginally lower density. For space-constrained equipment, materials with slightly higher density and greater magnetic flux density are often preferred.

Density is merely one of many selection criteria for silicon steel. It is recommended to first define the magnetic performance requirements of the working condition, then make comprehensive judgements based on silicon content and processing techniques.