Section
2 Materials
2.1 Castings
2.1.1 Castings
for propellers and propeller blades are to comply with the requirements
of the Rules for the Manufacture, Testing and Certification
of Materials (hereinafter referred to as the Rules for Materials).
The specified minimum tensile strength is to be not less than stated
in Table 7.2.1 Materials for propellers.
2.1.2 Where
it is proposed to use materials which are not included in Table 7.2.1 Materials for propellers, details of the chemical
composition, mechanical properties and density are to be submitted
for approval.
Table 7.2.1 Materials for propellers
| Material
|
SI Units
|
Metric Units
|
| Specified
minimum tensile strength
|
G
Density
|
U
Allowable stress
|
Specified
minimum tensile strength
|
G
Density
|
U
Allowable stress
|
| N/mm2
|
g/cm3
|
N/mm2
|
kgf/mm2
|
g/cm3
|
kgf/mm2
|
| Grey cast iron
|
250
|
7,2
|
17,2
|
25
|
7,2
|
1,75
|
| Spheroidal or nodular graphite cast iron
|
400
|
7,3
|
20,6
|
41
|
7,3
|
2,1
|
| Carbon steels
|
400
|
7,9
|
20,6
|
41
|
7,9
|
2,1
|
| Low alloy steels
|
440
|
7,9
|
20,6
|
45
|
7,9
|
2,1
|
| 13% chromium stainless steels
|
540
|
7,7
|
41
|
55
|
7,7
|
4,2
|
| Chromium-nickel austenitic
|
|
|
|
|
|
|
|
|
stainless
steel
|
450
|
7,9
|
41
|
46
|
7,9
|
4,2
|
| Duplex stainless steels
|
590
|
7,8
|
41
|
60
|
7,8
|
4,2
|
| Grade Cu 1
|
|
|
|
|
|
|
|
|
Manganese
bronze
(high tensile brass)
|
440
|
8,3
|
39
|
45
|
8,3
|
4,0
|
| Grade Cu 2
|
|
|
|
|
|
|
|
|
Ni-Manganese
bronze
(high tensile brass)
|
440
|
8,3
|
39
|
45
|
8,3
|
4,0
|
| Grade Cu 3
|
|
|
|
|
|
|
|
|
Ni-Aluminium
bronze
|
590
|
7,6
|
56
|
60
|
7,6
|
5,7
|
| Grade Cu 4
|
|
|
|
|
|
|
|
|
Mn-Aluminium
bronze
|
630
|
7,5
|
46
|
64
|
7,5
|
4,7
|
2.1.3 Spheroidal
cast iron load transmitting components of controllable pitch mechanisms,
are to be manufactured, tested and certified in accordance with Ch 7 Iron Castings of the Rules for Materials and have
an elongation of not less than 12 per cent.
|
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