Structural steel for hull is divided into strength grades according to its minimum yield point: general strength structural steel and high strength structural steel.
General strength steel for hull structure is divided into 4 grades: A, B, D, and E. The yield strength (not less than 235N/mm^2) and tensile strength (400～520N/mm^2) of these 4 grades of steel are the same , but the impact energy at different temperatures is not the same.
Steels for high-strength hull structures are divided into strength grades according to their minimum yield strength, and each strength grade is divided into A, D, E, and F4 grades according to their impact toughness. The yield strength of marine steel plate A32, marine steel plate D32, marine steel plate E32, and marine steel plate F32 is not less than 315N/mm^2, and the tensile strength is 440-570N/mm^2. A, D, E, and F represent their respective The impact toughness that can be achieved at 0°, -20°, -40°, -60°.
The yield strength of marine steel plate A36, marine steel plate D36, marine steel plate E36, and marine steel plate F36 is not less than 355N/mm^2, and the tensile strength is 490～620N/mm^2. A, D, E, and F represent their respective The impact toughness that can be achieved at 0°, -20°, -40°, -60°.
The yield strength of marine steel plate A40, marine steel plate D40, marine steel plate E40, and marine steel plate F40 is not less than 390N/mm^2, and the tensile strength is 510～660N/mm^2. A, D, E, and F represent their respective The impact toughness that can be achieved at 0°, -20°, -40°, -60°.
