The bulb flat steel is a kind of medium section steel which is mainly used in shipbuilding and bridge construction. In recent years, with the rapid development of shipbuilding industry, the demand of marine bulb flat steel is booming. In the design of the main hull of large ships and regular ships, the bulb flat steel with the same thickness and material as the connecting plate is used as the bone material (also known as rib or keel).
The material of bulb flat steel is corresponding to ship plate, which is divided into general strength (Grade A, Grade B and Grade D) and high strength (AH32, AH36, DH32 and DH36, etc.). The flat bulb steel certified by different classification societies shall be used for ship plates certified by different classification societies.
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