aluminium alloy for marine mainly use 5 series, 6 series and 7 series alloys. According to the aluminum alloy used in the hull structure and the aluminum alloy used in the outfitting, the aluminum alloy used in the hull structure mainly includes three alloys of 5083, 5086 and 5456. The 6 series alloy will cause intergranular corrosion in seawater, so it is mainly used for the superstructure of ships. The strength and process performance of the 7 series alloy after heat treatment are superior to that of the 5 series alloy. It has a broad application prospect in the field of aluminium alloy for marine. It is mainly used for the superstructure of ships, such as extruded structures and armor plates. However, the disadvantage of the 7 alloy is stress resistance. The corrosion performance is poor, so the use range of the alloy is limited.

aluminium alloy for marine application
use	Alloy	product type
Ship side, bottom outer plate	5083、5086、5456、5052	Board, profile
keel	5083	board
rib cage	5083	Board, profile
Ribs, next wall	5083、6061	board
Engine pedestal	5083	board
deck	5052、5083、5086、5456、5454、7039	Board, profile
Wheelhouse	5083、6101、5052	Board, profile
Bulwark	5083	Board, profile
Chimney	5083、5052	board
Top and side panels of marine vessels	3003、3004、5052	board
Porthole	5052、5083、6063	Profiles, castings
gangway	5052、5083、6063、6061	Profile
Mast	5052、5083、6063、6061	Tube, rod, profile