Section
2 Aluminium alloy rivets
2.1 Scope
2.1.1 Provision
is made in this Section for aluminium alloy rivets intended for use
in the construction of marine structures.
2.1.2 They are
to be manufactured and tested in accordance with the appropriate requirements
of Ch 8, 1 Plates, bars and sections and those detailed in
this Section.
2.2 Chemical composition
2.2.1 The chemical composition of bars used for the manufacture of rivets is to
comply with the requirements of Table 8.2.1 Chemical composition,
percentage.
Table 8.2.1 Chemical composition,
percentage
| Element
|
5154A
|
6082
|
| Copper
|
|
0,10
max.
|
0,10
max.
|
| Magnesium
|
|
3,1 –
3,9
|
0,6 –
1,2
|
| Silicon
|
|
0,50
max.
|
0,7 –
1,3
|
| Iron
|
|
0,50
max.
|
0,50
max.
|
| Manganese
|
|
0,1 –
0,5
|
0,4 –
1,0
|
| Zinc
|
|
0,20
max.
|
0,20
max.
|
| Chromium
|
|
0,25
max.
|
0,25
max.
|
| Titanium
|
|
0,20
max.
|
0,10
max.
|
| Other
elements:
|
each
|
0,05
max.
|
0,05
max.
|
|
|
total
|
0,15
max.
|
0,15
max.
|
| Aluminium
|
|
Remainder
|
Remainder
|
2.3 Heat treatment
2.3.1 Rivets are
to be supplied in the following condition:
| 5154A
|
-
|
annealed
|
| 6082
|
-
|
solution treated.
|
2.4 Test material
2.4.1 Bars intended
for the manufacture of rivets are to be presented for test in batches
of not more than 250 kg. The material in each batch is to be the same
diameter and nominal chemical composition.
2.4.2 At least
one test sample is to be selected from each batch and, prior to testing,
is to be heat treated in full cross-section and in a manner simulating
the heat treatment applied to the finished rivets.
2.5 Mechanical tests
2.5.1 At least
one tensile and one dump test specimen are to be prepared from each
test sample.
2.5.3 The dump
test specimen is to consist of a section cut from the bar with the
ends perpendicular to the axis. The length of this section is to be
equal to the diameter of the bar.
2.5.4 The results of tensile tests are to comply with the appropriate
requirements of Table 8.2.2 Mechanical properties for
acceptance purposes.
Table 8.2.2 Mechanical properties for
acceptance purposes
| Mechanical properties
|
5154A
|
6082
|
| 0,2% proof stress
N/mm2 min.
|
90
|
120
|
| Tensile strength
N/mm2 min.
|
220
|
190
|
Elongation on 5,65 % min.
|
18
|
16
|
2.5.5 The dump
test is to be carried out at ambient temperature and is to consist
of compressing the specimen until the diameter is increased to 1,6
times the original diameter. After compression, the specimen is to
be free from cracks.
2.6 Tests from manufactured rivets
2.6.1 At least
three samples are to be selected from each consignment of manufactured
rivets. Dump tests as detailed in Ch 8, 2.5 Mechanical tests are
to be carried out on each sample.
2.7 Identification
2.7.1 Each package
of manufactured rivets is to be identified with attached labels giving
the following details:
-
Manufacturer's name
or trade mark.
-
Alloy grade.
-
Rivet size.
2.8 Certification of materials
2.8.1 A manufacturer’s
certificate is to be issued (see
Ch 1, 3.1 General) and for each consignment of manufactured rivets is to
include the following particulars:
-
Purchaser's name and
order number.
-
Description and dimensions.
-
Specification.
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