Marine steel plate
Regarding marine steel plate materials, general-strength hull structural steel is categorized into four grades—A, B, C, and D;
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Regarding marine steel plate materials, general-strength hull structural steel is categorized into four grades—A, B, C, and D; these grades share the same yield strength (no less than 235 N/mm²) and tensile strength (400–520 N/mm²), differing only in their impact energy values at various temperatures. High-strength hull structural steel is classified into strength grades based on minimum yield strength, with each grade further subdivided into four levels—A, D, E, and F—according to impact toughness.
For grades A32, D32, E32, and F32, the yield strength is at least 315 N/mm² and the tensile strength is 440–570 N/mm²; the designations A, D, E, and F indicate the impact toughness achieved at temperatures of 0°C, -20°C, -40°C, and -60°C, respectively;
For grades A36, D36, E36, and F36, the yield strength is at least 355 N/mm² and the tensile strength is 490–620 N/mm²; the designations A, D, E, and F indicate the impact toughness achieved at temperatures of 0°C, -20°C, -40°C, and -60°C, respectively;
For grades A40, D40, E40, and F40, the yield strength is at least 390 N/mm² and the tensile strength is 510–660 N/mm²; the designations A, D, E, and F indicate the impact toughness achieved at temperatures of 0°C, -20°C, -40°C, and -60°C, respectively.
High-strength quenched and tempered steel for welded structures: 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
Steels for mechanical structures: Generally, the aforementioned steels may be selected;
Low-temperature toughness steels: 0.5NiA, 0.5NiB, 1.5Ni, 3.5Ni, 5Ni, 9Ni;
Austenitic stainless steels: 00Cr18Ni10, 00Cr18Ni10N, 00Cr17Ni14Mo2, 00Cr17Ni13Mo2N, 00Cr19Ni13Mo3, 00Cr19Ni13Mo3N, 0Cr18Ni11Nb;
Duplex stainless steels: 00Cr22Ni5Mo3N, 00Cr25Ni6Mo3Cu, 00Cr25Ni7Mo4N3;
Composite steel plates: Suitable for vessels and cargo tanks of chemical tankers;
Z-direction steel: Steel produced from a specific grade of structural steel (referred to as the base grade) through special treatments (such as calcium treatment, vacuum degassing, argon stirring, etc.) and appropriate heat treatment.
The above is excerpted from the CCS *Rules for Materials and Welding* (2006).
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