Construction of Hull Structures

 

Bottom Structure: In the bottom part of a ship, high-strength marine carbon steels (such as AH36, DH36, EH36 series) are widely used to construct key components like the keel and the outer bottom plating. The keel is the main longitudinal supporting structure of a ship and needs to withstand huge hydrostatic pressure and wave impact forces. The high yield strength of these steels (the minimum yield strength of AH36 is 355MPa) can ensure that the keel remains undeformed when bearing the weight of the ship and external water pressure. The outer bottom plating also faces the dual challenges of seawater corrosion and pressure. The good corrosion resistance and strength characteristics of high-strength carbon steels can effectively resist these factors and prevent cracks or damages on the bottom of the ship.

 

Side Structure: High-strength carbon steels are used for the side part of the ship. For example, DH32 and EH32 series are used for some ships that have requirements for low-temperature toughness. During the voyage of a ship, the side has to bear the impact of waves and possible collisions. The toughness of these steels enables the side to absorb energy when being impacted, reducing the risk of structural damage. Moreover, for ships sailing in cold sea areas, the use of steels with good low-temperature toughness, such as DH32 steel, on the side can avoid brittle fracture in a low-temperature environment.

 

Deck Structure: The deck is the main area for cargo loading and personnel activities on a ship and needs to bear the weight of cargo, the pressure of equipment, and the impact of waves. AH32 steel, due to its good balance of strength and toughness, is often used for the construction of the deck. It can ensure that the deck will not undergo plastic deformation due to local overloading during the process of cargo handling, and at the same time, it can maintain the integrity of the structure under the impact of waves.

 

 

 

 

 

 

 

 

 

 

Applications in Special Areas

 

Cargo Oil Tank Area (for Oil Tankers): For large oil tankers, EH32 and EH36 steels are ideal materials for the cargo oil tank area. The structural integrity of the cargo oil tank area of an oil tanker is of crucial importance because once a rupture occurs, it may lead to a serious oil spill accident. The high toughness of these steels can ensure that the structure of the cargo oil tank remains intact when the ship is in collision, runs aground, or is subjected to other unexpected impacts, effectively preventing oil spills.

 

 

 

Applications in Connection and Assembly

 

Welding Process: During the shipbuilding process, the good weldability of high-strength marine carbon steels plays an important role. Through appropriate welding processes, such as using low-hydrogen electrodes or gas shielded welding, different carbon steel components can be connected together. When welding, strict control of welding parameters (such as welding current, voltage, welding speed, etc.) can ensure that the strength and toughness of the welded joint are similar to those of the base material. For example, when welding AH32 steel components, selecting appropriate welding process parameters can make the quality of the welded joint meet the strength and toughness requirements of the ship structure.

 

Assembly and Forming: These steels can be made into various shapes of ship components through processing techniques such as cutting, bending, and forming. During the processing, the processing parameters should be reasonably controlled according to the characteristics of the steels. For example, when bending high-strength carbon steels, the minimum bending radius of the steel should be considered to avoid cracks caused by excessive bending. Meanwhile, during the assembly process, precise dimension control and a reasonable assembly sequence can ensure the tight connection between different components, improving the overall quality of the ship structure.

 

 

 

 

 

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