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); 2. Laag{2}alloy hoog{3}}stere spoel (opzichteg 355{6}690 MPa), wat mie es 50% verbeterde weerbestandheid biedt en specifiek is ontworpe veur lading-dragende structure zoe wie brögke en sjepe; 3. Hoog{{10}s}stere staolplaat (tijerkrach Groter of geliek aon 780 MPa), wat veurnaomelek gebruuk weurt in spoortransitatie en lugvaart, maar vereist de behandeling vaan hoege temperatuur bove 1000 graod veur ‘t vörme; 4. Roomloze staole spoel (chromiumgehalte Groeter daan of geliek aon 10,5%), wat resistent is tege zoer en alkali corrosie (jaorlijkse corrosiesnelheid<0.01mm), is a preferred material for food processing equipment.