The use of shipbuilding steel plates in ship construction is as follows:

 

I. Installation of internal structure

 

Frame and stiffeners:

Inside the ship's hull, shipbuilding steel plates are used to make frames and stiffeners to enhance the structural strength of the ship. The frame is usually composed of longitudinal and transverse steel beams and is connected to the ship shell and deck. Stiffeners are used to reinforce specific parts, such as the corners of the ship shell, the edges of the deck, and the connections of the bulkhead.

The installation of frames and stiffeners requires accurate measurement and positioning to ensure that they fit well with other parts of the ship. Welding or bolt connection is a commonly used fixing method, and the connection points need to undergo strict quality inspection.

Equipment base and support:

Various equipment on ships, such as engines, generators, cranes, etc., need to be installed on a solid base. Shipbuilding steel plates are processed into base plates suitable for the size and shape of the equipment and are fixed on the ship's structure by welding or bolts. The design of the base needs to consider the weight, vibration, and impact of the equipment to ensure stable operation of the equipment.

For some large equipment, stiffeners or support structures may be needed to further enhance the strength of the base.

 

 

 

 

High Strength Chemical Composition
Grade	C	Si	Mn	P	S
DNV steel	0.18	0.10-0.35	0.9-1.6	0.035	0.035

 

 

 

 

II. Surface treatment and protection

 

Anti-corrosion treatment:

Since ships are in a seawater environment for a long time, shipbuilding steel plates are easily corroded. In order to extend the service life of the steel plates, anti-corrosion treatment is required. Common anti-corrosion methods include painting, galvanizing, and spraying aluminum. These anti-corrosion coatings can form a protective film on the surface of the steel plate to prevent seawater and oxygen from contacting the steel plate and slow down the corrosion rate.

Before anti-corrosion treatment, the surface of the steel plate needs to be cleaned and pretreated to remove oil stains, rust, and other impurities to ensure that the coating can firmly adhere to the steel plate.

Anti-slip treatment:

Decks and some working areas need anti-slip treatment to prevent personnel from slipping and equipment from sliding. Shipbuilding steel plates can increase the surface friction by means of surface embossing, applying anti-slip coatings, or laying anti-slip mats. Anti-slip treatment needs to be selected according to different use environments and requirements to ensure safety and reliability.

 

III. Quality inspection and acceptance

 

Material inspection:

Before using shipbuilding steel plates, the quality of the steel plates needs to be inspected. The inspection contents include the chemical composition, mechanical properties, dimensional accuracy, and surface quality of the steel plates. Only steel plates that meet relevant standards and specifications can be used for ship construction.

Material inspection can be carried out by means of sampling inspection, non-destructive testing, etc., to ensure the stable and reliable quality of the steel plates.

Welding inspection:

Welding is a key connection method in ship construction, so the inspection of welding quality is extremely important. Welding inspection includes visual inspection, non-destructive testing, and mechanical property testing. Visual inspection mainly checks the shape, size, and surface quality of the weld seam. Non-destructive testing can detect internal defects in the weld seam, and mechanical property testing is used to verify the strength and toughness of the weld seam.

Welding inspection needs to be carried out by professional inspectors to ensure that the welding quality meets the design requirements and relevant standards.

Overall acceptance:

After the ship is built, overall acceptance is required. The acceptance contents include the integrity of the hull structure, the installation and commissioning of equipment, the effect of anti-corrosion treatment and anti-slip treatment, etc. Overall acceptance needs to be carried out in accordance with relevant standards and specifications to ensure that the ship has the conditions for safe navigation and use.

 

In summary, shipbuilding steel plates play a crucial role in ship construction. Through reasonable design, processing, and installation, shipbuilding steel plates can build a strong and durable hull structure and provide guarantee for the safe navigation and operation of ships. At the same time, strict quality inspection and acceptance are also key links to ensure the quality of ships.

 

 

 

 

 

 

 

 

 

 

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