deck of a boat
Shipbuilding steel plate refers to the thin steel plate and thick steel plate produced by special structural steel for shipbuilding, which are used to manufacture the hull structure of ships sailing in the ocean, coastal areas and inland rivers.
Structural steel for shipbuilding includes carbon steel and low alloy steel, and the end of the steel number is marked with C (Ship).
Carbon steel is 2C, 3C, 4C and 5C, and low alloy steel is 12MnC, 16MnC, 15MnTiC, 14MnVTiReC. The thickness is 2.5~50 mm.
Specification and material of special steel plate for shipbuilding
Trademarks can be divided into national standard, Japanese standard, American standard and German standard. According to the material, it can be divided into ordinary ship plates and high-strength ship plates.
According to the minimum yield point, structural steel for hull can be divided into general strength structural steel and high strength structural steel. Ship plate refers to the hot-rolled steel plate produced in accordance with the requirements of the construction code of classification society for the manufacture of hull structures. General strength structural steel specified by China Classification Society is divided into four quality grades: A, B, D and E (namely CCSA, CCSB, CCSD and CCSE); The high-strength structural steel of China Classification Society has three strength grades and four quality grades.
Hull structures are classified into Grade A, Grade B, Grade D and E4 with ordinary strength steel. The yield strength (not less than 235 N/mm 2) of these four steels is the same as the tensile strength (400 ~ 520 N/mm 2), but the impact work at different temperatures is different.
High-strength steel for hull structure is divided into strength grades according to its minimum yield strength, and each strength grade is divided into A, D, E and F4 grades according to its impact toughness.
The yield strength of A32, D32, E32 and F32 is not less than 3 15N/mm 2, and the tensile strength is 440 ~ 570N/mm 2. A, D, E and F respectively indicate that they can be reached at 0, -20, -40 and -60 respectively.
The yield strength of A36, D36, E36 and F36 is not less than 355 N/mm 2, and the tensile strength is 490 ~ 620 N/mm 2. A, D, E and F represent their impact toughness at 0, -20, -40 and -60 respectively.
The yield strength of A40, D40, E40 and F40 is not less than 390 N/mm 2, and the tensile strength is 5 10 ~ 660 N/mm 2. A, D, E and F respectively indicate that they can be used at 0, -20, -40 and -60 respectively.