What is the standard of steel for shipbuilding

What is the standard of steel for shipbuilding ?Product specifications: thickness of 4.5-50mm, width 1.0-2.2 mm, length 4.0-12.0 m. Our country is mainly produced by wu gang, ma steel, shanggang one, three factories, taisteel, kunming steel company and tianjin steel plant. 2. The hull is divided into two types of structural steel and high strength steel, and the general strength steel is divided into four grades: A, B, C and D; High strength steel is divided into two strength levels and three quality grades. AH32, DH32, EH32, AH36, DH36, EH36. The steel plate is mainly used to make steel plates for the ships of ocean-going, coastal and inland waterways. url:http://www.gneesteels.com