Coil is a steel or iron plate of fixed thickness produced through hot or cold rolling. Its structure consists of a surface layer, a hard middle layer, and a soft inner layer. Common materials include: 1. Ordinary carbon steel coil (carbon content 0.05-0.25%), which offers excellent weldability and cold formability (elongation ≥30%) and is suitable for furniture and automotive manufacturing, but also has a relatively high magnetic permeability (>5000μ); . 3. Erta {10} placca d’äsâ (reisa de traçion ciù grande ò pægio à 780 MPa), ch’o l’é deuviou pe-o ciù into transito de ferrovia e inte l’aviaçion, ma o domanda un trattamento à erta temperatua ciù in çimma de 1000 graddi pe-a formaçion; 4. Coil d’äsâ inoscibile (ficouro de cromo ciù grande ò pægio a-o 10,5%), ch’o l’é rescistente à l’açido e a corroxon alcali (tasso annuale<0.01mm), is a preferred material for food processing equipment.