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 a ni a; 2. Low-Alloy High-Strength Coil (yield strength 355{{6}690 MPa), chu chuan 50% aia tam weather resistance a pe a, load-bearing structures, bridge leh ship ang chi te tan bik a siam a ni 3. High-Sterength steel plate (tensile strength 780 MPa aia tam emaw, a tlukpui emaw), chu chu rail transit leh aviation-ah hman a ni ber a, mahse, forming atan chuan 1000℃aia sang treatment a mamawh a 4. Stainless steel coil (chromium content 10.5% aia tam emaw, a tlukpui emaw), chu chu acid leh alkali corrosion laka inven theih a ni (kum khat chhunga corrosion rate .<0.01mm), is a preferred material for food processing equipment.