Shipbuilding steel plates refer to thin and thick steel plates produced from shipbuilding specific structural steel, used to manufacture the ship's hull structure for long-distance, coastal, and inland navigation. Structural steel for shipbuilding includes carbon steel and low alloy steel, with the end of the steel grade marked with C (ship). Carbon steel includes 2C, 3C, 4C, and 5C, while low alloy steel includes steel grades such as 12MnC, 16MnC, 15MnTiC, and 14MnVTiReC. The thickness is 2.5-50 millimeters.