Marine steel plate refer to the steel used to manufacture the hull structure of sea-going ships and inland watercrafts, usually high-quality carbon steel and high-quality low-alloy steel. Marine steel plate is required to have certain strength, toughness, and low temperature resistance and corrosion resistance, as well as good welding performance.
General strength hull structure steel is divided into 4 grades: A, B, D, E. The yield strength (not less than 235N/mm^2) and tensile strength (400～520N/mm^2) of these 4 grades of steel The same, but the impact energy is different at different temperatures.
High-strength hull structure steel is divided into strength grades according to its minimum yield strength, and each strength grade is divided into A, D, E, F 4 grades according to its impact toughness.
Due to the harsh working environment of the ship, the hull of the hull is subject to seawater chemical corrosion, electrochemical corrosion, marine organisms, and microbial corrosion; the hull bears greater wind and wave impact and alternating loads; the shape of the ship makes the processing method complicated, so it is not Shipboard steel plates have strict requirements. First of all, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, welding performance, processing and forming performance and surface quality are required.
