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 (>5000O); 2. Hasi - 3. Hejuru - Imbaraga Icuranga (Imbaraga za Tensile zirenze cyangwa zikoreshwa cyane muri gari ya moshi na indege ndende, ariko bisaba kuvura cyane hejuru kurwego rwa 1000 kugirango ushyireho impamyabumenyi 1000 yo gukora impamyabumenyi 1000 yo gushinga impamyabumenyi 1000. 4. Ibiceri bitagira ingano (Chromium irenze cyangwa ingana na 10.5%), birwanya aside na alkali (igipimo cya ruswa buri mwaka<0.01mm), is a preferred material for food processing equipment.