CCS/NV/GL420 steel is structural steel for ships and marine engineering, divided into four quality grades: A, D, E, F, namely AH420, DH420, EH420, FH420. H is high-strength building materials, and 420 is the lower yield strength. AH420 steel plate is used to manufacture ocean-going, coastal and inland navigation ships, fishing vessels and marine engineering structures. The thickness of the steel plate is not more than 150mm.
The grades specified in the GB712-2011 ship and marine engineering structural steel standard are: A, B, D, E, AH32, DH32, EH32, FH32, AH36, DH36, EH36, FH36, AH40, DH40, EH40, FH40, AH420 , DH420, EH420, FH420, AH460, DH460, EH460, FH460, AH500, DH500, EH500, FH500, AH550, DH550, EH550, FH550, AH620, DH620, EH620, FH620, AH690, DH690, EH690, FH690
AH420 steel plate delivery status: thermomechanical rolling (TMCP), quenching and tempering (tempering), thermomechanical rolling + tempering (TMCP+T)
AH420, DH420, EH420 and FH420 ship plates are structural steels for high-strength and high-strength hulls. Shipbuilding steel generally refers to steel for hull structure, which refers to the steel produced in accordance with the requirements of the classification society for making hull structures.
