Ship’s different components are suitable for using different steel

In shipbuilding, different components and structures typically require different grades and types of steel, depending on their functions and performance requirements. 

Hull Structure
The main hull structure typically uses high-strength shipbuilding structural steel, such as AH36 and DH36. These steels offer excellent weldability and corrosion resistance, suitable for withstanding hull loads and the challenges of marine environments.

Hatch Covers and Decks
Components like hatch covers and decks may use general strength structural steel, such as Grade A or Grade B steel, providing sufficient strength and weathering resistance.

Ship Fittings
These fittings typically use common structural steel, such as ordinary carbon structural steel.

Internal Piping and Electrical Facilities
Support structures for internal piping and electrical facilities may use stainless steel, such as Grade 304 or Grade 316 stainless steel, offering good corrosion resistance and structural support.

Propulsion Systems and Machinery
Support structures for propulsion systems and machinery often require high-strength special alloy steel or shipbuilding engineering structural steel to handle high loads and complex working environments.

Protective Structures and Plating
Protective structures and plating often use abrasion-resistant steel or high-strength structural steel to provide effective protection and durability.

Common grades of shipbuilding steel
ASTM A131 Grade A, B, D, E
ABS Grade A, B, AH32, DH32, EH32, AH36, DH36, EH36
DNV Grade A, B, D, AH32, DH32, EH32, AH36, DH36, EH36
CCS Grade A, B, AH32, DH32, EH32, AH36, DH36, EH36