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I. Observing Surface Texture Features

Silicon steel sheets have a unique identifying mark: the surface insulating coating. Examine under a magnifying glass:

• High-quality oțel siliconic: Uniform off-white coating with fine crystalline luster
• Ordinary steel: No coating at all, or rough dark oxide scale
• Counterfeit products: Uneven coating with frequent air bubbles or cracks

Tip: Gently scrape the surface with a fingernail. Genuine oțel siliconic only leaves shallow scratches without powder flaking off.

II. Simple Magnetic Test Experiment

Professional inspection can be done with just a magnet:

• Attraction test: Silicon steel delivers moderate magnetic attraction and slides off easily
• Residual magnetism observation: Barely retains magnetism once the magnet is removed
• Comparative test: Ordinary steel sheets exert strong, persistent attraction, while electrical steel shows weak attraction

Note: Avoid testing edge areas; flat surfaces yield more accurate results.

III. Sound Test via Bending

Silicon steel produces a distinctive sound when bent:

• Bent at 30°: Emits a clear crisp “ding” sound with excellent springback performance
• Ordinary cold-rolled steel sheet: Muffled sound with obvious creases at the bend
• Inferior material: May crack directly or produce a hoarse grinding noise

Safety reminder: Wear gloves during operation to prevent cuts from sharp edges.