Steel coil, also known as coiled steel. The steel is hot-pressed and cold-pressed into rolls. In order to facilitate storage and transportation, and facilitate various processing (for example, processing into steel plates, steel belts, etc.) Patterned coils, or patterned steel plates, are also called reticulated steel plates, which are steel plates with rhombuses or ribs on the surface. Due to the ribs on its surface, the patterned steel plate has anti-skid effect, and can be used as floor, factory escalator, work frame pedal, ship deck, automobile floor, etc. The specifications of checkered steel plates are expressed in terms of basic thickness (not counting the thickness of the ribs), and there are 10 specifications of 2.5-8 mm. No. 1-3 is used for checkered steel plate.