6.3.1.1 Tensile testing shall be carried out in
accordance with recognized standards.
6.3.1.2 Tensile strength, yield stress and elongation
shall be to the satisfaction of the Administration. For carbon-manganese
steel and other materials with definitive yield points, consideration
shall be given to the limitation of the yield to tensile ratio.
6.3.2.1 Acceptance tests for metallic materials
shall include Charpy V-notch toughness tests, unless otherwise specified
by the Administration. The specified Charpy V-notch requirements are
minimum average energy values for three full size (10 mm × 10
mm) specimens and minimum single energy values for individual specimens.
Dimensions and tolerances of Charpy V-notch specimens shall be in
accordance with recognized standards. The testing and requirements
for specimens smaller than 5 mm in size shall be in accordance with
recognized standards. Minimum average values for subsized specimens
shall be:
| Charpy V-notch
specimen size (mm)
|
Minimum average energy
of three specimens
|
| 10 x 10
|
KV
|
| 10 x 7.5
|
5/6 KV
|
| 10 x 5
|
2/3 KV
|
where:
|
KV |
= |
the energy values
(J) specified in tables 6.1 to 6.4. |
Only one individual value may be below the specified average
value, provided it is not less than 70% of that value.
6.3.2.2 For base metal, the largest size Charpy
V-notch specimens possible for the material thickness shall be machined
with the specimens located as near as practicable to a point midway
between the surface and the centre of the thickness and the length
of the notch perpendicular to the surface as shown in figure 6.1.
6.3.2.3 For a weld test specimen, the largest
size Charpy V-notch specimens possible for the material thickness
shall be machined, with the specimens located as near as practicable
to a point midway between the surface and the centre of the thickness.
In all cases, the distance from the surface of the material to the
edge of the specimen shall be approximately 1 mm or greater. In addition,
for double-V butt welds, specimens shall be machined closer to the
surface of the second welded section. The specimens shall be taken
generally at each of the following locations, as shown in figure 6.2,
on the centreline of the welds, the fusion line and 1 mm, 3 mm and
5 mm from the fusion line.
Figure 6.2
Notch locations in figure 6.2:
-
.1 Centreline of the weld.
-
.2 Fusion line.
-
.3 In heat-affected zone (HAZ), 1 mm from the
fusion line.
-
.4 In HAZ, 3 mm from the fusion line.
-
.5 In HAZ, 5 mm from the fusion line.
6.3.2.4 If the average value of the three initial
Charpy V-notch specimens fails to meet the stated requirements, or
the value for more than one specimen is below the required average
value, or when the value for one specimen is below the minimum value
permitted for a single specimen, three additional specimens from the
same material may be tested and the results be combined with those
previously obtained to form a new average. If this new average complies
with the requirements and if no more than two individual results are
lower than the required average and no more than one result is lower
than the required value for a single specimen, the piece or batch
may be accepted.
6.3.3.1 The bend test may be omitted as a material
acceptance test, but is required for weld tests. Where a bend test
is performed, this shall be done in accordance with recognized standards.
6.3.3.2 The bend tests shall be transverse bend
tests, which may be face, root or side bends at the discretion of
the Administration. However, longitudinal bend tests may be required
in lieu of transverse bend tests in cases where the base material
and weld metal have different strength levels.
6.3.4
Section observation and other
testing
Macrosection, microsection observations and hardness tests
may also be required by the Administration, and they shall be carried
out in accordance with recognized standards, where required.