Introduction to ABS, DNV, CCS, NK AH40, DH40, EH40, FH40 Mild Steel Plates/Sheets for Shipbuilding

Classification Societies and Grades

ABS (American Bureau of Shipping), DNV (Det Norske Veritas), CCS (China Classification Society), and NK (Nippon Kaiji Kyokai) are well - recognized classification societies in the shipbuilding industry. AH40, DH40, EH40, and FH40 are different grades of mild steel plates/sheets used for shipbuilding. The letters "A", "D", "E", and "F" generally represent different levels of quality and performance requirements, and the number "40" indicates the minimum yield strength (in ksi or approximately 275MPa when converted) of the steel.

Typical Applications

These steel plates/sheets are used in various parts of ship structures. They are used to build the hull, decks, bulkheads, and other components. For example, in the construction of a large - scale tanker, the hull plating may use these high - strength mild steel plates to withstand the internal and external pressures exerted by the cargo and the sea. In a container ship, the deck and hold structures are also made of such steel to support the weight of containers and the dynamic loads during voyages.

 

 

 

 

 

 

Name	Carbon Steel sheet for Shipbuilding and Bridge
Standard	ANSI,ASTM,DIN,GB
Material Grade	Grade A,Grade B,Grade D,Grade E AH32 DH32 EH32 FH32 AH36 DH36 EH36 FH36 AH40 DH40 EH40 FH40 DH55 EH55 FH55 E550 E620 E690 E420 E460 E500
THK	5-350mm
WTH	1500-4020mm

 

 

Mechanical Properties of the Steel Plates/Sheets

Strength Properties

The minimum yield strength of AH40, DH40, EH40, and FH40 grades is around 275MPa. Their tensile strengths vary depending on the grade and specific requirements. For example, the tensile strength of these grades generally ranges from around 400 - 520MPa. The high - strength nature of these steels enables them to bear the heavy loads and stresses experienced by ships, such as the static load of the ship's own weight and cargo, as well as the dynamic loads from waves, wind, and ship movements.

The elongation at break is also an important mechanical property. These grades usually have an elongation of around 22 - 25% (depending on the specific product standard and testing conditions). This ductility allows the steel to deform plastically to a certain extent before fracture, which is crucial for absorbing energy during impact events such as collisions and for preventing brittle failure of the ship's structure.

 

 

 

 

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