What is the difference between marine steel plate and ordinary steel plate?

Marine steel plate is classified as medium-thick plates, which are hot-rolled steel plates produced in accordance with the requirements of the classification society construction rules for the manufacture of ship structures. First of all, good toughness is the most critical requirement for marine steel plates. In addition, it requires high strength, good corrosion resistance, welding performance, processing and forming performance and surface quality. In order to ensure quality and ensure sufficient toughness, the chemical composition of Mn/C is required to be above 2.5, and the carbon equivalent is also strictly required, and it is produced by a steel plant approved by the ship inspection department.

Marine steel plates are divided into strength levels according to their minimum yield points: general-strength structural steel and high-strength structural steel. There are two types of structural steel for hulls: general strength and high strength steel. General strength steel is divided into four grades according to quality: A, B, C, and D; high strength steel is divided into two strength grades (32, 36) and three quality grades. (A, D, E), the main specifications are AH32, DH32, EH32, AH36, DH36, EH36.

The general-strength structural steels of the China Classification Society standard are divided into four quality grades: A, B, C, and D (ie CCSA, CCSB, CCSC, CCSD); the high-strength structural steels of the China Classification Society standard include three Intensity level, four quality levels.