Aluminum square tubing 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 square tubing is ofen used for shipbuilding., mainly used in hull structures and generally consists of bottom plates, bottom plates, side plates, bulge plates, bulwarks, decks, 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 square tube is heat-treatable, resistant to stress cracking and non-magnetic.

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

Marine Aluminum Square Box 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

Mechanical Properties of Marine Aluminum Square Box
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

Material Code	A(mm)	Wall Thickness(mm)	NR	WR	G (Kg/m)
TF-76	13	1.100			0.141
CAM_A000804	15	1.000			0.151
CAM_A000483	15	2.000			0.281
TF-01	19	1.000			0.194
TF-162	19	1.200			0.229
CAM_DOO5057	19.05	1.270			0.244
CAM_D004780	19.05	1.397	0.56	1.96	0.258
CAM_D005804	19.05	1.590			0.299
CAM_A000861	19.05	1.630			0.306
CAM_DOO0561	19.05	1.650			0.311
ALD_D001817	19.05	1.830	6.28	6.28	0.34
CAM_D001786	19.05	2.413	0.8	2.8	0.416
CAM_DOO0848	19.05	3.180			0.543
TF-40	20	1.000			0.205
TF-52	20	1.000			0.205
TF-40	20	1.200			0.244
TF-52	20	1.400			0.281
TF-40	20	1.500			0.3
CAM_A000394	20	1.500			0.3
CAM_A000280	20	2.000			0.389
ALD_D000566	20	3.000			0.551
ALD_D000567	20	3.000	3	3	0.551
CAM-632	24.8	2.300	1	2	0.552
CAM_A000984	25	1.500			0.381
ALD_D000568	25	1.600			0.404
CAM_A000281	25	2.000			0.497
ALD_D000400	25	3.000		3	0.692
ALD_D000569	25	3.000	3	3	0.713
TF-02	25.4	1.000			0.264
CAM_D004978	25.40	1.020	3.96	3.96	0.267
CAM_D004686	25.40	1.140	0.79	1.98	0.292
TF-02	25.4	1.200			0.314
ALD_D000528	25.4	1.220			0.319
CAM_D004198	25.40	1.270	1.27	2.54	0.319
CAM_D002819	25.40	1.400	0.56	1.96	0.354
CAM_DOO0847	25.4	1.570			0.406
CAM_D001027	25.40	1.575	2.39	2.39	0.405
CAM_A000860	25.4	1.630			0.417
CAM_DOO0234	25.4	1.650			0.424
CAM_D004046	25.40	1.905	2.06	3.96	0.457
CAM_DOO0047	25.4	3.050			0.734
CAM_D000835	25.40	3.175	0.91	3.96	0.728
CAM_D001028	25.40	3.180	3.18	3.18	0.760
CAM_DOO0235	25.4	3.180			0.76
CAM_A000696	25.4	3.250			0.778
CAM_D002024	28.58	1.880	1.52	3.18	0.524
CAM_A000282	30	1.500			0.462
CAM_A000108	30	2.000			0.605
TF-110	30	2.000			0.605
CAM_A000350	30	3.000			0.875
CAM_DOO0048	31.75	3.050			0.943
CAM_DOO0236	31.75	3.180			0.978
CAM_A000840	31.75	3.250			1.001
CAM_D004463	31.75	4.763	4.76	4.76	1.387
ALD_D000529	32.00	2.000			0.648
ALD_D000398	32.00	3.000			0.940
CAM_A000739	34	2.000			0.691
CAM_A000530	34	3.000			1.004
CAM_D004886	34.37	3.175	0.79	3.18	1.048
CAM_A000459	35	2.000			0.713
CAM_A000607	35	3.000			1.037
CAM-609	35.5	2.000	2	4	0.696
CAM-609	35.5	2.000	4	4	0.696
TF-164	38	1.600	0.5	1	0.627
CAM_D006306	38.1	1.020	3.96	3.96	0.408
CAM_DOO4329	38.1	1.020			0.408
CAM_D004199	38.10	1.143	1.9	3.05	0.443
CAM_D004689	38.10	1.143	1.57	0.38	0.461
CAM_D004974	38.10	1.143	3.96	3.96	0.456
CAM_D000113	38.1	1.270			0.505
CAM_D004688	38.10	1.397	0.56	1.96	0.546
CAM_D005666	38.10	1.520	1.27	2.54	0.591
CAM_D001235	38.10	1.575	0.4	0.4	0.621
CAM_D000028	38.10	1.600	1.6	3.2	0.612
CAM_DOO1327	38.1	1.650			0.65
CAM_DOO0049	38.1	3.050			1.152
CAM_D002821	38.10	3.175	1.52	3.18	1.178
CAM_D005267	38.10	3.175	1.52	0.81	1.201
CAM_DOO0237	38.1	3.180			1.196
CAM_A000697	38.1	3.250			1.198
CAM_D000834	38.10	3.556	3.18	3.18	1.326
ALD_D001136	40.00	1.600			0.664
CAM_A000283	40	2.000			0.821
CAM_A000351	40	2.500			1.013
CAM_A000261	40	3.000			1.199
ALD_D000571	40	3.000		3	1.179
CAM_A000284	40	4.000			1.555
CAM_DOO0050	44.45	3.050			1.362
CAM_DOO2020	44.45	3.180			1.416
ALD_D003044	45	1.500			0.705
CAM_A000360	45	2.000			0.929
TF-167	50	1.000			0.529
TF-39	50	1.000			0.529
TF-39	50	1.200			0.632
TF-39	50	1.400			0.735
TF-39	50	1.500			0.786
ALD_D000411	50	1.600	4.2	6	0.794
ALD_D002719	50	1.600			0.836
ALD_D000612	50	1.800	4.7	6.5	0.89
ALD_D000820	50	1.900	4.6	6.5	0.938
TF-39	50	2.000			1.037
CAM_A000358	50	2.000			1.037
AUS_D000270	50	2.000	4	6	0.99
ALD_D000399	50	2.500			1.283
TF-39	50	3.000			1.523
CAM_A000051	50	3.000			1.523
CAM_A001049	50	3.200			1.617
CAM_A000352	50	4.000			1.987
ALD_D001137	50.8	1.800	4.5	6.3	0.908
ALD_D000573	50.8	2.000	4	6	1.008
CAM_D000697	50.80	2.540	0.63	2.36	1.312
CAM_DOOOO51	50.8	3.050			1.57
CAM_D000692	50.80	3.175	0.4	3.2	1.609
CAM_DOOO238	50.8	3.180			1.631
ALD_D000413	50.8	3.180	1.55	4.75	1.589
CAM_A000699	50.8	3.250			1.67
CAM_DOOO239	50.8	4.780			2.374
CAM_DOOO968	50.8	6.100			2.943
CAM_D000823	50.80	6.350	3	3.2	3.046
CAM_DOOO240	50.8	6.350			3.047
CAM_A000460	55	2.000			1.145
ALD_D003217	55	2.000	2	4	1.117
ALD_D003017	56.8	2.000	3.2	5	1.149
TF-94	60	1.200			0.762
TF-72	60	1.400			0.885
CAM_A000531	60	2.000			1.253
TF-72	60	2.500			1.552
TF-72	60	3.000			1.846
CAM_A000353	60	3.000			1.847
CAM_A000109	60	4.000			2.419
CAM_DOO4584	63.5	6.100			3.778
CAM_DOO0241	63.5	6.350			3.918
TF-45	65	1.400			0.961
TF-24	67	1.200			0.853
CAM_A000719	70	2.000			1.469
CAM_A000448	70	4.000			2.851
AUS_D000631	75	3.000	2	5	2.284
TF-19	76	1.000			0.81
TF-19	76	1.200			0.969
TF-19	76	1.500			1.207
ALD_D002752	76	6.200	9.8	16	4.303
CAM_D005242	76.20	2.286	6.35	3.17	1.898
CAM_DOO0242	76.2	3.180			2.502
CAM_A000701	76.2	3.250			2.561
CAM_DOO0243	76.2	4.780			3.683
CAM_DOO0969	76.2	6.100			4.614
CAM_D002749	76.20	6.350	6.35	10.03	4.649
CAM_D002823	76.20	6.350	3.18	9.53	4.603
CAM_DOO0244	76.2	6.350			4.788
CAM_A000268	80	2.000			1.685
CAM_A000354	80	3.000			2.495
CAM_A000359	80	4.000			3.283
CAM_A000356	80	5.000			4.05
CAM_A000485	80	6.000			4.795
CAM_A000882	80	8.000			6.221
TF-117	85	1.200			1.086
CAM_D006107	85.73	6.350	6.35	6.35	5.444
TF-128	86	1.900			1.726
CAM_D000399	88.90	3.175	1.6	3	2.924
CAM_DOO4587	88.9	6.100			5.45
TF-114	90	1.400			1.34
CAM_A000602	90	4.000			3.715
TF-116	93	1.200			1.19
TF-20	100	1.500			1.596
CAM_A000642	100	2.000			2.117
TF-20	100	2.000			2.117
CAM_A000548	100	3.000			3.143
CAM_A001050	100	3.800			3.948
CAM_A000052	100	4.000			4.147
CAM_A000449	100	5.000			5.13
CAM_A000827	100	10.000			9.72
TF-81	101.6	1.500			1.622
CAM_D000400	101.60	3.175	1.6	3	3.359
CAM_D000698	101.60	3.175	3.18	6.35	3.302
CAM_DOO0432	101.6	3.180			3.372
CAM_A000703	101.6	3.250			3.453
CAM_D000694	101.60	4.775	4.8	4.8	4.991
CAM_DOO1653	101.6	4.780			4.991
CAM_DOO0433	101.6	6.100			6.286
CAM_D001021	101.60	6.350	0.4	6.35	6.437
CAM_D002346	101.60	6.350	6.35	12.7	6.249
CAM_DOO6525	101.60	6.350	0.79	1.57	6.528
CAM_DOO1652	101.6	6.350			6.53
TF-120	120	2.150			2.799
CAM_A000663	120	2.500			3.173
CAM_A000532	120	5.000			6.21
TF-205	120	7.000	1	1	8.54
TF-132	126.5	3.000			4.001
CAM_DOO2669	127	3.180			4.243
CAM-107	140	12.000	3	3	16.589
AUS_D000411	150	3.750			5.923
CAM_DOO2667	152.4	3.180			5.113
CAM_D005777	152.4	12.700			19.161
CAM-106	160	12.000	3	3	19.181
CAM_DOO2266	203.2	9.530			19.915
ALD_D003625	250	12.000	4	12	30.548