LR grade A shipbuilding plate is a kind of general strength shipbuilding steel plate, which is mainly used to build ship hull and hull structure. LR grade A shipbuilding plate is a kind of hull structural steel with good toughness, high strength, strong corrosion resistance, processability and weldability. In the steel standard ASTM A131/A131M, offshore steel grade ASTM A131 A is the best equivalent material withLR grade A shipbuilding plate.
LR grade A shipbuilding plate chemical composition
The conten of C is 0.21.
The conten of Si is 0.50.
The content of Mn is 2.5*C.
The content of P is 0.035.
The content of S is 0.035.
Good toughness is the most important requirement of LR grade A shipbuilding plate. In addition, LR grade A shipbuilding plate is required to have high strength, good corrosion resistance, weldability, processability and surface quality. In order to ensure the quality and toughness of LR grade A shipbuilding plate, the Mn/C of chemical composition is required to be more than 2.5, and the carbon equivalent of LR grade A shipbuilding plate is also strictly required.
