Steel coil products have high strength, good toughness, and many steel specifications, so they are also widely used, from general engineering structures to the manufacture of automobiles, bridges, ships, boilers, and pressure vessels. For different applications, the requirements on material properties, surface quality, size, and shape accuracy of steel sheets are also different. Therefore, it is necessary to understand the varieties, materials, characteristics, and uses of steel coil products in order to achieve economic and reasonable utilization.