Based on the Ship's Structural Parts and Stress Conditions

 

Main Support Structure of the Hull
For key parts such as the keel and the outer bottom plating that bear huge hydrostatic pressure and wave impact force, steels with high yield strength are required. For example, AH36, DH36, and EH36 series have a relatively high minimum yield strength (the minimum yield strength of AH36 is 355MPa), which can ensure that they do not deform when bearing the weight of the ship and external water pressure, providing solid longitudinal and bottom support for the ship.

 

Deck and Cargo - carrying Area
The deck needs to bear multiple loads such as the weight of the cargo, the pressure of the equipment, and the impact of the waves. A steel with a good balance of strength and toughness like AH32 steel is a more appropriate choice. It can prevent plastic deformation due to local overloading during the process of cargo handling and maintain the structural integrity under the impact of the waves, ensuring the safety of the ship's cargo - carrying and personnel activities.

 

Cargo Oil Tank Area (for Oil Tankers)
Once the cargo oil tank area of an oil tanker ruptures, it will lead to a serious oil spill accident. Therefore, this area has extremely high requirements for structural integrity. High - toughness steels such as EH32 and EH36 can effectively prevent the damage of the cargo oil tank structure when the ship is in collision, runs aground, or is subjected to other unexpected impacts, ensuring the safety of navigation.

 

Combine Machining and Welding Properties

 

Machining Properties
During the ship - building process, the steel needs to go through machining processes such as cutting, bending, and forming. If the shape of the ship's components is complex, it is necessary to select steel with good machining properties. Some high - strength marine carbon steels need to consider the minimum bending radius during the bending process to avoid cracks caused by excessive bending. Therefore, according to the specific requirements of the machining process, the steel that can adapt to these machining operations should be selected to ensure that the quality of the components after machining meets the ship - building standards.

 

Welding Properties
A ship is composed of numerous steel components welded together, so good welding performance is of vital importance. Select high - strength marine carbon steel with good weldability, and different components can be firmly connected through appropriate welding processes (such as using low - hydrogen electrodes or gas - shielded welding). Moreover, during the welding process, strict control of welding parameters (such as welding current, voltage, and welding speed) can ensure that the strength and toughness of the welded joint are similar to those of the base material, improving the overall reliability of the ship's structure. For example, for some key parts that require high - precision welding, steel with stable welding performance should be selected to ensure the welding quality.

 

 

 

 

 

LR is refers to Lloy'd Register of Shipping in UK,founded in 1760, first member of International Classification Society.

 

Grade A is ship hull construction steel plate with normal strength. It consists of A B D E 4 grades.

Yield strength is not lower than 235N/M2

 

 

Refer to Relevant Standards and Specifications

 

Classification Society Standards
Different classification societies (such as LR - Lloyd's Register, ABS - American Bureau of Shipping, etc.) have detailed standards and specifications for ship - building steels. When selecting steel, it is necessary to ensure that the selected steel meets the requirements of the classification society to which the ship belongs. For example, LR Grade A steel is a ship - building steel that meets the standards of Lloyd's Register. When building a ship according to the Lloyd's Register's specifications, this kind of steel can be considered for use. These standards cover various aspects such as the chemical composition, mechanical properties, and quality control of the steel and are an important basis for ensuring the quality and safety of the ship.

 

International and National Industry Standards
At the same time, it is also necessary to refer to relevant international (such as ISO standards) and national (such as the ship - building standards of various countries) industry standards. These standards comprehensively consider various factors of ship - building and provide more comprehensive guidance for the selection of suitable high - strength marine carbon steel. For example, on the basis of meeting the classification society's standards, selecting according to the internationally - used steel quality standards can further ensure the quality and applicability of the steel.

 

 

 

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