General strength hull structure steel is divided into A, B, C, D4 grades, the yield strength of these 4 grades of steel (not less than 235N/mm^2) and tensile strength (400~520N) /mm^2) is the same, except that the impact energy is different at different temperatures; the high-strength hull structure steel is divided according to its minimum yield strength, and each strength grade is divided into Grade A, Grade D, Grade E, Grade F levels.
The yield strength of the shipduilding steel materials A32, D32, E32 and F32 is not less than 315N/mm², and the tensile strength is 440~570N/mm². A, D, E and F respectively indicate that they can each be at 0°, - Impact toughness at 20°, -40°, -60°; yield strength of A36, D36, E36, F36 is not less than 355N/mm², tensile strength is 490～620N/mm², A , D, E, F respectively indicate the impact toughness that can be achieved under the conditions of 0°, -20°, -40°, -60° respectively; the yield strength of A40, D40, E40, F40 is not less than 390N /mm², tensile strength 510 ~ 660N/ mm ², A, D, E, F respectively said that they can be achieved at 0 °, -20 °, -40 °, -60 ° Impact toughness. Also, the welded structure is made of high-strength quenched and tempered steel: A420, D420, E420, F420; A460, D460, E460, F460; A500, D500, E500, F500; A550, D550, E550, F550; A620, D620, E620 , F620; A690, D690, E690, F690; steel for boilers and pressure vessels: 360A, 360B; 410A, 410B; 460A, 460B; 490A, 490B; 1Cr0.5Mo, 2.25Cr1Mo mechanical structure steel: generally can be used above Steel; low temperature toughness steel: 0.5NiA, 0.5NiB, 1.5Ni, 3.5Ni, 5Ni, 9Ni; austenitic stainless steel: 00Cr18Ni10, 00Cr18Ni10N, 00Cr17Ni14Mo2, 00Cr17Ni13Mo2N, 00Cr19Ni13Mo3, 00Cr19Ni13Mo3N, 0Cr18Ni11Nb; duplex stainless steel: 00Cr22Ni5Mo3N, 00Cr25Ni6Mo3Cu, 00Cr25Ni7Mo4N3 . Composite steel plate: suitable for containers and cargo tanks of chemical transport vessels; Z-direction steel: based on a certain grade of structural steel (called parent steel), after special treatment (such as calcium treatment, vacuum degassing, argon Gas agitation, etc.) and appropriately heat treated steel.
Hull structural steel generally refers to steel for hull structure, which refers to the steel used to manufacture the hull structure produced in accordance with the requirements of the construction society. It is often used as a special steel for ordering, scheduling, and sales. A ship includes ship plates and steel sections. At present, several major steel companies in China have produced, and can produce marine steel products of different national standards according to user needs, such as the United States, Norway, Japan, Germany, France, etc.
