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 (>5000 μ); 2. Baso-a alaliga alto- la bobina de un resistencia (resistencia de rendimientos 355-690 MPa), que ofrece mas de 50% de resistencia meteorologica y es específicamente diseñada para la carga{8}} portador de estructuras como los pontes y las naus; 3. High- placa d'acièr (resisténcia a la tension Major o egala a 780 MPa), qu'es utilizat principalament dins lo transit ferroviari e l'aviacion, mas demanda un tractament de nauta temperatura per dessús de 1000 gras per la formacion; 4. Bobina d'acièr inoxidable (conte de crom Mebres que o egal a 10,5%), qu'es resistent a la corrosion acida e alcali (taxa de corrosion annala<0.01mm), is a preferred material for food processing equipment.