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); 2 .. kurang - aloi kumparan dhuwur - (pangaturan daya 355 {{60 mpa) 3. Dhuwur - piring baja kekuatan (kekarepan tegor luwih saka utawa padha karo transit rel lan penerbangan utamane ing ndhuwur 1000 gelar kanggo mbentuk; 4. Coil Stainless steel (kandungan kromium luwih saka utawa padha karo 10,5%), sing tahan asam lan karat alkali (tingkat korosi alkali<0.01mm), is a preferred material for food processing equipment.