Introduction
Silicon steel, an essential soft magnetic material, has established itself as a key player in contemporary industrial applications. Ranging from small-scale operations in relays and pulse transformers to large-scale use in generators, motors, and transformers, silicon steel continues to grow in importance. Its adoption has been driven by the need for more efficient energy use and the miniaturization of powerful equipment.
Silicon Steel: An Evolutionary Journey
The initial soft magnetic material, iron, came with its share of impurities. However, upon the discovery of silicon's addition, there was a marked improvement in resistivity, reduction in hysteresis loss, an increase in permeability, and a near-total elimination of aging. Today, we see large quantities of oriented silicon steel primarily in power and distribution transformers. But that doesn't make non-oriented silicon steel any less important. Non-oriented silicon steel finds its extensive use where low-cost, low-loss material is indispensable, especially in rotating equipment.
Key Properties of Silicon Steels
1. Resistivity
In comparison to iron, silicon steel shows a significant increase in resistivity. This increase reduces core loss by minimizing the eddy current component, hence improving energy efficiency.
2. Saturation Induction
The degree to which silicon steel can be magnetized, or its saturation induction, is another vital property. The higher the silicon content, the lower the saturation induction. It's a balancing act between maintaining high resistivity and ensuring adequate saturation induction.
3. Magneto-crystalline Anisotropy and Magnetostriction
These properties influence how the material behaves under the influence of magnetic fields and mechanical stress, respectively. While increasing silicon content lowers magnetostriction, the processing becomes more challenging.
4. Curie Temperature
The Curie temperature, which is quite high for iron, can be reduced by alloying elements. However, the decrease doesn't significantly impact silicon steel users.
Cold rolled non grain oriented steel
