Medium-thickness steel plate is a wide ratio of width and thickness and surface area of the flat steel, steel plate thickness greater than or equal to 5.0mm, divided into plain carbon plate, high-carbon plate, low alloy plate, ship plate, bridge plate, boiler plate, vessel plate, and so on.
In practice, the thickness of the steel plate is often <=20mm called plate, thickness >20-60mm plate called thick plate, thickness >60mm plate called extra thick plate, collectively referred to as medium-thickness steel plate.