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SETTING A NEW MARINE STANDARD
Setting a new marine standard
Performance is as important in the yard as it is on the water. You want
high performance, user-friendly materials that give you the freedom to
express your vision. Structural efficiency. Unimpeachable quality. And
genuine versatility.
That’s why so many of today’s best performing vessels, large and
small, are constructed from Alcoa aluminium. Ever since we developed
strain-hardened 5xxx series alloys to provide the exceptional strength,
workability and corrosion resistance that marine applications require,
aluminium has been the material of choice for forward-looking
designers wherever durability, economy of operation and construction,
responsiveness or sheer speed are priorities.
Photograph courtesy of Damen Shipyards Group, Netherlands, 2008
Photograph courtesy of Kvichak maine Industries
Photograph courtesy of Mondo Marine, Italy, 2008
H128. Combining improved corrosion
resistance with high yield strength
Alcoa’s new temper for marine sheet is specifically designed to
provide both commercial and naval shipbuilders with improved
corrosion resistance. H128 meets an accelerated corrosion test
specified by the US Navy to provide resistance to sensitisation and
contribute to ships meeting their planned service life.
Nautic-Al H128 provides superior thermal stability and higher
corrosion resistance, reducing risk and lowering maintenance and
repair costs. Additionally, building with H128 offers the possibility of
cost saving through less painting costs and simplified warranty plans.
The excellent corrosion resistance of Nautic-AL alloys is one of
their most important characteristics. Welds of these products are
normally as corrosion resistant as the parent alloy. Under certain
conditions, however, such as exposure to high temperatures,
marine alloys may become susceptible to inter-granular and
exfoliation corrosion.
Another Alcoa ‘first’
Photograph courtesy of CRN Shipyard, Italy, 2008
Regular, prolonged, periods of deck temperatures above 70 ºC have
been recorded on Naval ships and corrosion, in combination with
the stress endured during the long service life of a vessel, can lead
to cracks in both painted and unpainted ship hulls. This inevitably
leads to higher maintenance costs or substantial repair costs to
remedy water intrusion.
Alcoa was first to develop this new temper through a two-year
development programme between the Alcoa Technical Center in
Pittsburgh (USA) and the manufacturing facilities in Fusina (Italy)
and Davenport (USA), and filed it for registration at the US
Aluminium Association, along with a revision to ASTMB928 to
include H128 and its testing requirements.
SETTING A NEW MARINE STANDARD
Naval Aluminium
Think Light
With a specific weight about one third that of steel, an
aluminium hull and superstructure typically weighs less
than half as much as a steel one of equivalent strength.
This lightness translates into greater capacity, speed or fuel
economy and range as well as conferring inherently superior
manoeuvrability. The advantage is even greater in vessels of
less than 30 metres (where hull weight is more critical)
because of minimum plate thickness.
Stronger
An aluminium hull will survive significantly higher ultimate
loads than a comparable GRP (glass reinforced plastic) hull,
and since aluminium is less brittle there is less risk of hull
penetration. Additionally small holes do not enlarge with
external pressure as is the case with GRP. Aluminium has far
greater structural efficiency (stiffness-to-density ratio) than
steel – and with magnesium as the major alloying element, the
fatigue strength of 5xxx series products is among the highest
of all aluminium alloys.
Nautic-Al H128 – High Yield Strength and
Corrosion Resistance
5454-H32
1
2
3
Corrosion Resistance
www.alcoa.com/nautical
4
Easier
Aluminium is of course as easy to work as it is versatile – easy
to cut, bend, cold form and engineer with standard tools. Alcoa
5xxx alloys are quick to weld using GMA-W or GTA-W
processes; not only does aluminium resist distortion during
welding better than steel, but the welds themselves are highly
ductile for subsequent cold forming. Taken together, these
factors deliver considerable cost advantages for the constructor.
Total capability
5083 H128
5086
0
With a microstructure designed for
excellent corrosion resistance in the
harshest marine environment,
aluminium sheets are the perfect
choice and can have a positive impact
on long-term maintenance. They are
suitable for a wide range of surface
treatments. All Nautic-Al products
meet or exceed the ASTM B928 standard for high magnesium
aluminium-alloy sheet and plate for marine service and
therefore meet the corrosion requirements of both the ASTM
G66 (ASSET) and ASTM G67 (NAMLT) tests.
5
The undisputed world leader in aluminium production and
technology, Alcoa gives you the benefit of complete technical
design, engineering and production support. All the marine
aluminium products in the comprehensive Nautic-Al range
are tested to the highest international standards. And as
you would expect of a company voted one of the most
sustainable corporations on the planet by the World
Economic Forum every year since the ranking began,
Alcoa products are easy to recycle - almost 70% of the
aluminium ever produced is still in use.
Photograph courtesy of Austal Shipyards, Australia.
5083
Yield Strength
5456
Tougher
Mechanical Properties
The following limits are given according to EN 485-2 standard. Tensile testing performed according to EN 10002-1 standard.
Alloy
Temper
O
H111
EN AW5083
H112
H116
H321
H128
O
H111
EN AW5086
H112
H116
H321
O
EN AW5456
H116
H321
EN AW5154A
O
H111
O
H111
EN AW5754
H32
H34
H32
EN AW5052
H34
(1) For information only
Thickness
mm
Over
Up to
≥ 1,5
3,0
3,0
6,3
6,3
12,5
12,5
50,0
50,0
80,0
≥ 8,1
12,5
12,5
40,0
40,0
80,0
≥ 1,5
3,0
3,0
6,0
6,0
12,5
12,5
40,0
40,0
60,0
> 3,0
8
≥ 1,5
3,0
3,0
6,0
6,0
12,5
12,5
80,0
≥ 8,1
12,5
12,5
40,0
40,0
80,0
≥ 1,5
3,0
3,0
6,0
6,0
12,5
12,5
50,0
> 1,5
6.3
6.3
80,0
> 1,6
12,5
12,5
30,0
30,0
40,0
40,0
60,0
> 2,5
4,0
4,0
12,5
12,5
40,0
40,0
60,0
≥ 1,5
3,0
3,0
6,0
6,0
12,5
12,5
50,0
≥ 1,5
3,0
3,0
6,0
6,0
12,5
12,5
80,0
≥ 1,5
3,0
3,0
6,0
6,0
12,5
≥ 1,5
3,0
3,0
6,0
6,0
12,5
≥ 1,5
3,0
3,0
6,0
6,0
12,5
≥ 1,5
3,0
3,0
6,0
6,0
12,5
Rm
Mpa
Min.
275
275
270
270
270
275
275
270
305
305
305
305
285
305
240
240
240
240
250
240
240
275
275
275
275
290
285
315
315
305
285
330
315
305
285
215
215
215
215
190
190
190
190
220
220
220
240
240
240
210
210
210
230
230
230
Max.
350
350
345
345
345
385
310
310
310
310
365
360
405
405
385
370
275
275
275
275
240
240
240
240
270
270
270
280
280
280
260
260
260
280
280
280
Rp0,2
Mpa
Min.
Max.
125
125
115
115
115
125
125
115
215
215
215
215
200
215
100
100
100
100
105
105
100
195
195
195
195
130
205
125
205
230
230
215
200
235
230
215
200
85
85
85
85
80
80
80
80
130
130
130
160
160
160
130
130
130
150
150
150
Elongation, min.
%
A50
A
13
15
16
15
14
12
10
10
8
10
12
10
10
10
13
15
17
16
8
9
12
8
9
10
9
16
16
14
10
10
10
10
10
12
10
10
15
17
18
16
16
18
18
17
10
11
10
7
8
10
7
10
12
6
7
9
Bend radius
180°
1,5 t
90°
1,0 t
1,5 t
2,5 t
3,0 t
2,0 t
2,5 t
4,0 t
1,0 t
1,5 t
2,0 t
2,5 t
1,0 t
1,5 t
2,5 t
2,0 t
2,5 t
3,5 t
2,5 t
4,0 t
4,0 t
1,0 t
1,0 t
1,5 t
2,5 t
1,0 t
1,0 t
1,0 t
1,0 t
2,0 t
2,0 t
1,5 t
1,5 t
2,5 t
2,0 t
2,5 t
3,0 t
1,5 t
1,5 t
2,5 t
2,0 t
2,5 t
3,0 t
2,5 t
1,5 t
2,0 t
Hardness
HBW (1)
75
75
75
75
73
75
75
73
89
89
89
89
89
89
65
65
65
65
69
65
65
81
81
81
81
80
80
90
90
90
85
90
90
85
85
58
58
58
58
52
52
52
52
63
63
63
70
70
70
61
61
61
67
67
67
Chemical Composition
Alloy
%
Si
Fe
Cu
Mn
Mg
Cr
Zn
Ti
5083
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
0.40
0.40
0.25
0.50
0.40
0.25
0.40
0.50
0.40
0.50
0.40
0.40
0.10
0.10
0.10
0.10
0.10
0.10
0.40
1.00
0.20
0.70
0.50
1.00
0.50
0.50
0.10
4.00
4.90
3.50
4.50
4.70
5.50
3.10
3.90
2.60
3.60
2.20
2.80
0.05
0.25
0.05
0.25
0.05
0.20
0.25
0.30
0.15
0.35
0.25
0.25
0.25
0.20
0.20
0.10
0.15
0.15
0.20
0.20
0.15
-
5086
5456
5154A
5754
5052
Others (%)
each
total
0.05
0.15
0.05
0.15
0.05
0.15
0.05
0.15
0.05
0.15
0.05
0.15
Reference EN 573-3
Rolled Products
Alloy
5083
Characteristics
Typical Uses
Tempers
Shipyard sheet and plate, naval and fast
Strongest alloy, with excellent resistance to
ship hulls, yacht hulls, LNG storage tanks,
corrosion, highly suitable for welding.
chemical equipment, welded superstructures
(high strength), pressure vessels.
0
H111
H112
H116
H321
5083
H128
Strong thermally stable alloy
with highest resistance to corrosion.
Shipyard sheet and plate, naval and fast
ship hulls, yacht hulls, LNG storage tanks,
chemical equipment, welded superstructures
(high strength), pressure vessels.
H128
5086
High strength with excellent resistance
to corrosion in marine environment. Good
workability and weldability.
Shipyard sheet and plate, shipping drums,
support structures, welded structures,
bulkheads, patrol and work boat hulls.
0
H111
H116
H321
5154A
Very good corrosion resistance. Good
weldability and formability. Medium-high
strength (higher than 5754). High fatigue
strength. Good anodizing properties.
Welded structure, storage tanks, pressure
vessels, tanks, ship masts.
0
H111
5456
Superior alloy, with excellent resistance to
corrosion, highly suitable for welding.
Shipyard sheet and plate, naval and fast ship
hulls, yacht hulls, welded superstructures
(highest strength).
5754
5052
Superior corrosion resistance at elevated
temperatures, high strengths, good
workability and weldability.
Applications with prolonged temperatures
higher than 66 ºC. Welded structures,
separators.
0
H116
H321
0
H111
H32
H34
Dimensions
The dimensional limits of the products which can be supplied depend upon
alloys and tempers. In the following table the absolute limits are given for
indication only.
Product name
Cold rolled sheets
Hot rolled plates
Thickness (mm)
Min
3,0
8,0
Max
8,0
60,0
Width (mm)
Min
980
900
Max
2500
2020
Length (mm)
Min
1000
1000
Max
15000
12000
Dimensional Tolerances
The allowed dimensional tolerances are in compliance with the limits
provided by the applicable required standards (i.e., EN 485-3, EN 485-4,
ANSI H35.2). Other sizes, thickness and tighter tolerances on request.
Typical Physical Properties
Alloy
5083
5086
5456
5154A
5754
5052
Density
Average Coefficient of
Thermal Expansion
(20÷100 ºC)
2.66 x 103 kg/m3
2.67 x 103 kg/m3
2.66 x 103 kg/m3
2.68 x 103 kg/m3
2.68 x 103 kg/m3
2.68 x 103 kg/m3
23.8 x 10-6 per ºC
23.8 x 10-6 per ºC
23.9 x 10-6 per ºC
23.8 x 10-6 per ºC
23.7 x 10-6 per ºC
23.8 x 10-6 per ºC
580÷640 ºC
585÷640 ºC
570÷640 ºC
595÷645 ºC
595÷645 ºC
605÷650 ºC
Modulus of Elasticity
117 W/m ºC
(at 25 ºC)
71 Gpa
126 W/m ºC
(at 25 ºC)
71 Gpa
117 W/m ºC
(at 25 ºC)
71 Gpa
129 W/m ºC
(at 25 ºC)
70.5 Gpa
132 W/m ºC
(at 25 ºC)
70.5 Gpa
138 W/m ºC
(at 25 ºC)
70.5 Gpa
Poisson’s ratio
0.33
0.33
0.33
0.33
0.33
0.33
Electrolytic Solution
Potential
-0.91 V*
-0.88 V*
-0.87 V*
-0.86 V*
-0.86 V*
-0.86 V*
Approximate Melting Range
Thermal Conductivity
*Versus 0.1 N calomel electrode in an aqueous solution containing 53 g NaCl plus 3 g H2O per litre.
Typical Technological Properties
Welding capability
Alcoa Nautic-Al marine aluminium can be welded by TIG, MIG, Electron Beam or Spot welding. The mechanical properties in the
heat-affected zone after welding* for marine sheet and plate alloys are summarized below:
Alloy
5083
5086
5456
5154A
5754
5052
* Butt joint welding. 5356 or 5183 filler.
Temper
0
H111
H112
H116
H321
H128
0
H111
H112
H116
H321
0
H116
H321
0
H111
0
H111
H32
H34
0
H111
Thickness
(mm)
Rm
(MPa)
Rp,02
(MPa)
All
≥ 275
≥ 125
All
≥ 240
≥ 100
All
≥ 285
≥ 125
All
≥ 215
≥ 85
All
≥ 190
≥ 80
All
≥ 165
≥ 65
Certifications
When materials are specified for marine use, and when applicable, they are supplied according to ASTM B928, ASTM B209
standards or upon request to ABS, Bureau Veritas, Det Norske Veritas, Lloyd’s Register, RINA and other rules.
Alloy Class
designation
Certification body
5083
American Bureau
of Shipping
ABS
5086
Bureau Veritas
BV
5083
NV-5052
NV-5754
Det Norske VeritasGermanischer Lloyd
DNV-GL
NV-5154A
NV-5083
GL AW-5083
NV-5086
Lloyds Register
LR
Registro Italiano
Navale RINA
Korean Register
KR
5083
5083
5083P
5086P
Nippon Kaiji
Kyokai NKK
5083P
5083
China Classification
Society
5083
Temper
0
H112
H116
H321
H128
H111
0
H112
H116
H321
H111
0
H111
H112
H116
H321
H128
H32
H34
0
H111
H32
H34
0
H111
0
H111
H112
H116
H321
H128
0
H116
0
H111
H112
H321
H116
H128
0
H111
H321
H116
H128
0
H112
H116
H321
H128
H116
0
H112
H116
H321
H111
H32
H128
O
H111
H112
H116
H321
Max approved
Thickness (*)
Material specification
Certification procedure
60 mm
ABS Rules
ABS Quality
Assurance Program
8 mm
60 mm
ASTM B928
EN 485-2
50 mm
Witness test
ABS Rules
ABS Quality
Assurance Program
EN 485-2
Witness test
According to
EN10204 3.2
+
ABS Cover
BV Mode I
According to
EN10204 3.2
+
BV Cover
DNV Manufacturer
Survey Arrangement
Witness test
According to
EN10204 3.2
+
GL Certificate
Material Quality
Scheme
According to
EN10204 3.2
Alternative Testing
Scheme (COLALT)
According to
EN10204 3.2
Witness test
KR Certificate
NKK Approval
8 mm
EN 485-2
EN 485-2 (≤ 40 mm)
ASTM B209 (> 40 mm)
ASTM B928
According to
EN10204 3.2
+
NKK Certificate
60 mm
CCS Rules
CCS Approval
CCS Certificate
60 mm
BV Rules
8 mm
ASTM B928
10 mm
50 mm
10 mm
10 mm
DNV-GL Rules
60 mm
8 mm
ASTM B928
50 mm
DNV Rules
60 mm
60 mm
40 mm
8 mm
40 mm
60 mm
8 mm
60 mm
LR Rules
ASTM B928
RINA Rules
ASTM B928
KR Rules
8 mm
50 mm
NKK Rules
60 mm
(*) Minimum thickness 3 mm
Global Rolled Products
Alcoa GmbH
Heinrichstrasse 24
40239 Düsseldorf
Germany
Technical specifications are correct at time of printing. March 2016.
Inspection document
T: +49 211 47 111 0
F: +49 211 47 111 90
W:www.alcoa.com/grp
www.alcoa.com/nautical