5083 and 5086 are non heat treatable alloys. The mechanical properties of the alloy depend on the chemical composition of the alloy and the hot rolling temperature. The supply status of marine 5083 and 5086 alloy is O, H111 and H112. Among them, the latter is resistant to stress corrosion, and can prevent the tropical climate from intergranular corrosion cracking.  
6061 and 6082 aluminum alloys are widely used as light structural materials and widely used in transportation materials. 6061 and 6082 alloy extrusion products need any double base heat treatment for age hardening. The working procedure is as follows:  heating billet, extrusion, profile quenching, solid solution treatment, straightening, aging in furnace. Only by strictly controlling the technological parameters of each process can a satisfactory mechanical performance be achieved.  
Marine aluminum alloy profiles are generally used on three types of structures:
 
First, the main force structure with the strength as the main factor, mainly includes the hull structure and superstructure.
 
Different types of ships with different ship structure, ship structure generally include bottom plate, bottom plate, side plates, sheer strake, bulwark, deck, bulkhead, coaming, ribs, elbow plate, longitudinal beams, ribs, keel, reinforcement, pillar and pole.  
The upper atmosphere structure forecastle, bridge and poop. The upper body as the cabin and placement of some ship equipment with the cab, studio, the crew and passengers of the living room and life. The upper structure includes frame, beam, door board, ceiling, partitions, fences and other special angle aluminum profile.
 
Seond,, that is, not force construction or force less components. For example, all kinds of fittings (anchor, mast, chimney, ladder, line and circuit device), oil tank, water tank, watertight doors, windows, cover, sanitary equipment, piping, ventilation, windshield, bracket, streamlined shell, handle, handrail, cylinder, piston, base, sling device and furniture etc. etc..  
Third.  The thrid structures refer to decorative and insulated components. The aluminum can color anodized,  and the color anodized aluminum is used as an ornament, which is beautiful, economical and practical.
 
Marine Aluminum Round Tube Specification:
Alloy:  5083, 5086,5383, 5059, 6061, 6082, 6005A
Temper: H111/H112, T5/T6
Certificate: BV /DNV /ABS/Lioyds
Thickness: 3mm---50mm

Mechanical Properties of Marine Aluminum Round Tube
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 Round Tube 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