Aluminum I beam is the most commonly used aluminum for structural applications. It has good machinability, above average corrosion resistance, and is excellent for welding.

Marine grade aluminum I beam is ofen used for shipbuilding., mainly used in hull structures and generally consists of bottom plates, bottom plates, side plates, decks, bulge plates, bulwarks, bulkheads, hoardings, ribs, brackets, stringers, ribs, keels, rebars, columns and rods.It has above average corrosion resistance, good machinability, and is excellent for welding.
6061 T6 aluminum i-beam is heat-treatable, resistant to stress cracking and non-magnetic.

6063-T5 aluminum i-beam is excellent for outdoor use and architectural trim due to its superior corrosion resistance.
Marine grade aluminum i-beam Specification:
Alloy:  5083, 5086, 5383, 5059, 6061, 6063,6082,6005A
Temper: H111/H112, T5/T6
Certificate: BV /DNV /ABS/Lioyds
Thickness: 3mm---50mm

Mechanical Properties of Marine Aluminum I Beam
Alloy	Form	Thickness(mm)	Temper	Rm	Rp0.2 (Mpa)	A% Min
				Min.		A₅₀	A
5086	Shapes, Bar, Tube	3≤t≤50	H112	240	95	10	12
5083	Shapes, Bar, Tube Shapes, Bar, Tube	3≤t≤50 3≤t≤50	H111 O and H112	270  270	110     125	10    10	12     12
5059	Shapes, Bar, Tube	3≤t≤50	H112	330	200		10
5383	Shapes, Bar, Tub	3≤t≤50	O	290	145	17	17
	Shapes, Bar, Tub	3≤t≤50	H112	310	190		13
6061	Shapes, Bar, Tube Profiles	3≤t≤50 3≤t≤50	T5 or T6 T5 or T6	260   245	240    205	10	8       4
6005A	Shapes, Bar, Tube Profiles	3≤t≤50	T5	260	215	9	8
	Shapes, Bar, Tube Profiles	3≤t≤10	T6	260	215	8	6
		10≤t≤50		250	200	8	6
6082	Shapes, Bar, Tube Closed shapes	3≤t≤50 3≤t≤50	T5 or T6 T5 or T6	310     290	260    240	10	8       5

Marine Aluminum I Beam Aluminum Alloys Composition
Alloy	Si	Fe	Cu	Mn	Mg	Cr	Ni	Zn	Ti	Ga	Others		Alu
											Each	Toal
5083	0.40	0.40	0.1	0.4-1.0	4.0--4.9	0.05--0.25	--	0.25	0.15	--	0.05	0.15	Remainder
5383	0.25	0.25	0.20	0.7-1.0	4.0-5.2	0.25	--	0.40	0.15	--	0.05	0.15	Remainder
5086	0.40	0.50	0.1	0.2--0.7	3.5-4.5	0.05-0.25	-	0.25	0.15	-	0.05	0.15	Remainder
5059	0.45	0.50	0.25	0.6-1.2	5.0-6.0	0.25	-	0.40-0.9	0.20	-	0.05	0.15	Remainder
6061	0.4-0.8	0.7	0.15-0.40	0.15	0.8-1.2	0.04-0.35	-	0.25	0.15	-	0.05	0.15	Remainder
6005A	0.50-0.9	0.35	0.30	0.50	0.40-0.7	0.30	-	0.20	0.10	-	0.05	0.15	Remainder
6082	0.7-1.3	0.5	0.1	0.4-1.0	0.6-1.2	0.25	-	0.20	0.10	-	0.05	0.15	Remainder