Hot-rolled coil (hot-rolled coil) is a kind of steel produced by high-temperature rolling process. It has the characteristics of high strength, good toughness and low cost. It is widely used in the fields of construction, machinery, automobiles, home appliances, etc. In construction, it is often used in steel structure beams and bridges; in machinery manufacturing, it can be used as a structural part or component base material of engineering equipment; in the automotive industry, it is mostly used for body frames and chassis parts.