AH36 steel plate is a steel plate with a thickness not greater than 150mm for manufacturing oceangoing, coastal and inland navigation ships, fishing boats and marine engineering structures. Steel plates with Z-direction requirements add Z25 and Z35 to the suffix, and are used as structural steel for high-strength ships and marine engineering.
AH36 steel plate is usually delivered in the state of hot rolling, controlled rolling, normalizing and thermomechanical rolling. AH36 steel plate should be delivered by shearing or flame cutting.
The carbon content of high-strength ship plate steel is less than or equal to 0.18%, while the Mn content is generally 0.6~1.6%. AH36 ship plate, DH36 ship plate and EH32 ship plate, EH36 ship plate high-strength steel add 0.015~0.05%Nb and 0.030~0.10%V.
Grade D steel plates can be produced by controlled rolling and controlled cooling processes, but steel plates with a thickness greater than 35mm generally require normalizing treatment.
The delivery condition of grade E steel plate requires normalizing treatment.
At present, some medium and heavy plate rolling mills still adopt controlled rolling and controlled cooling process when producing D-grade ship plate and E-grade ship plate steel with a thickness of more than 25mm, which require heat treatment. The fine original structure before heat treatment can further improve the effect of heat treatment and improve the performance of steel plate.
