Hull steel is the engineering structural steel of the hull structure of the sailing ship. It is mainly supplied in steel plates, and also includes some section steel and pipes. Hull steel is required to have high strength, high toughness, good welding performance and high seawater corrosion resistance.
Since the entire hull is a large welded structure when the ship is manufactured, in order to reduce the welding workload, shorten the construction cycle and improve the overall rigidity of the hull structure. Large hull steel mostly uses wide and thick steel plates and requires large line energy welding capacity (welding heat input is large) At 50kJ/cm, up to 500kJ/cm), its carbon equivalent shall not be greater than 0.45.
The structural steel for ships (GB712-2011) mainly uses high-quality low-carbon structural steel, and its grades (AH32, AH36, AH40) adopts the international common representation method. The English letters are used to indicate the quality grade first. A large number of F-grade steels that require -60°C impact toughness have been produced and used in large quantities. The number after the letter indicates yield strength.
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