3.1.1 Steel should be manufactured and tested in accordance with the
Rules
for the Manufacture, Testing and Certification of Materials (hereinafter
referred to as the Rules for Materials) or other acceptable standards. The strength
and grades (notch toughness) of steel required will depend on the following:
- design temperature;
- thickness;
- substance being stored/processed;
- structural category;
- location.
3.1.3 Critical joints which depend upon the transmission of tensile stress
through the thickness perpendicular to the plate surface of one of the members are
to be avoided wherever possible. Where these types of joints are unavoidable the
through plate member should have suitable through thickness properties in accordance
with Pt 4, Ch 2, 4.1 General 4.1.3.
3.1.5 Where attachments/pads are located on special or primary components
which are subjected to high stresses, the attachment is to be of the same material
as the plating to which it is attached, with welding to the same standard as the
main structure.
3.1.6 Steel having a specified minimum yield stress of 235 N/mm2 is
regarded as normal strength hull structural steel. Steel having a higher specified
minimum yield stress is regarded as higher strength hull structural steel.
3.1.7 For the determination of hull girder section modulus, where higher
strength hull structural steel is used, a higher strength steel factor, k, is
given in Table 1.3.1 Values of k.
Table 1.3.1 Values of k
| Specified
minimum yield stress, N/mm2
|
k
|
| 235
|
1,00
|
| 265
|
0,93
|
| 315
|
0,78
|
| 340
|
0,74
|
| 355
|
0,72
|
| 390
|
0,68
|
| NOTE
|
| Intermediate
values are to be calculated by linear interpolation.
|