Steel plates for shipbuilding are carbon and alloy steel plates used in offshore and marine engineering. Common grades include A, B, D, E, AH32/36/40, DH32/36/40, EH32/36/40, etc., ranging from different strengths. These plates are commonly used in the manufacture of hulls, bulk carriers, container ships and LNG carriers, bulkheads, upper decks and hatch covers.

The primary application is already in the name of shipbuilding steel: These steel grades are used for cabin structures on cruise ships. Particularly thin plates are used in large widths for such applications. These sheets exhibit best processing properties such as flatness and weldability. High-strength, thermomechanically rolled ship plates, on the other hand, are used in the offshore sector. They are used for deck superstructures on platforms or for special ships in the oil and gas industry.

High-strength shipbuilding steel plates can be divided into: AH32, DH32, EH32; AH36, DH36, EH36 and AH40, DH40, EH40.
1,General grades A, B, D, E are distinguished by the impact temperature of the steel. The impact value of all steel grades is the same.
2, High-strength hull structural steel preheating requirements: for all AH, DH, EH plate thickness greater than 30mm angle, butt joints, preheat to 120 ~ 150 ℃ before welding.
3, Plate thickness ≤ 30mm, ambient temperature below 5 ℃, preheating to 75 ℃; ambient temperature below 0 ℃, preheating to 75 ~ 100 ℃.

Shipbuilding plates can be divided into the following grades according to their yield strength：
Grade A steel is the impact force at room temperature (20 °C).
Class B steel is impact force at 0 °C.
Class D steel at -20 °C.
Grade E steel at -40 °C.