Classification Society Standards and Grades

ABS (American Bureau of Shipping), BV (Bureau Veritas), CCS (China Classification Society), DNV GL (Det Norske Veritas Germanischer Lloyd), KR (Korean Register of Shipping), LR (Lloyd's Register), NK (Nippon Kaiji Kyokai) are well - known classification societies. These societies set standards for shipbuilding materials to ensure their quality and safety for marine applications.

Ah32/Ah36/Dh32/Dh36 are high - strength shipbuilding steel grades. The numbers (32 and 36) generally refer to the minimum yield strength in ksi (kilo - pounds per square inch). These steels are used in the construction of ship hulls and other marine structures where high strength and good toughness are required.

Carbon Steel Plate Properties

Carbon content: These are carbon steel plates. The carbon content affects the strength and hardness of the steel. Generally, the carbon content in these steels is in a range that provides a balance between strength and ductility.

Mechanical properties:

Tensile strength: They have specific tensile strength requirements. For example, Ah36 steel has a minimum yield strength of 36 ksi and a tensile strength in a certain range that enables it to withstand the loads and stresses in a marine environment.

Impact toughness: Good impact toughness is crucial for withstanding the dynamic loads from waves, collisions, etc. The steels are designed to have sufficient toughness to prevent brittle fracture.

Weldability: Weldability is an important property as shipbuilding involves extensive welding. These steels are formulated to have good weldability, allowing for proper joining without significant degradation of mechanical properties.

Surface Treatment - Shotblasting and Primer

Shotblasting: Shotblasting is a surface preparation method. It cleans the steel surface by propelling small abrasive particles at high velocity. This process removes rust, scale, and other contaminants from the surface, creating a clean and roughened surface. The roughened surface provides better adhesion for the primer and subsequent coatings.

Primer: The application of a primer after shotblasting is beneficial. The primer acts as a first - line defense against corrosion. It provides a barrier between the steel and the environment and also helps in improving the adhesion of the topcoat (if any). The primer can be a zinc - rich primer, epoxy primer, etc., depending on the specific requirements and the intended use of the steel plate.

 

 

 

 

 

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

 

 

Other Steel Grades (A36/A572/S275/S355jr/S355jo/Ss400/St37/St52)

A36: It is a common carbon steel grade in the US. It has good mechanical properties and is widely used in structural applications. It has a minimum yield strength of 36 ksi and is suitable for general construction purposes.

A572: This is a high - strength low - alloy (HSLA) steel. It offers higher strength than A36 and is used in applications where more strength is required, such as in heavy - duty structures.

S275/S355jr/S355jo: These are European structural steel grades. S355jr and S355jo are part of the S355 family. S355jr has good weldability and formability, and S355jo has enhanced through - thickness properties. S275 is a lower - strength grade compared to S355 and is used in less demanding structural applications.

Ss400: It is a Japanese structural steel grade. It has similar characteristics to other general - purpose structural steels and is used in a wide range of applications.

St37/St52: These are German structural steel grades. St37 is a mild - strength steel, and St52 is a higher - strength grade. They are used in various structural and mechanical applications.

 

These steel plates, with their different grades and surface treatments, find wide applications in shipbuilding, construction, and other industries where high - quality carbon steel with specific properties is required.

 

 

 

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