(3) Basic process to be used in producing the material. Sufficient
information is required to demonstrate that the procedures ensure that
repeatable material properties are obtainable by the process used.
(4) Data demonstrating lack of susceptibility to failure when
subjected to dynamic shock.
(5) Effect of flaws such as cracks or defects on material
performance.
(6) Effects of temperature on material performance and resistance
to crack propagation.
(7) Results of tests to destruction of samples fabricated from the
materials and comparison of these results with the design basis predictions
of the failure point.
(8) Fatigue data in the high-strain, low-cycle range (less than
10,000 cycles) in environment (e.g., seawater, marine atmosphere, air,
HeO2).
(9) Data covering an extended time period establishing the
adequacy of the material with respect to general corrosion and to
stress-corrosion cracking in seawater and marine atmosphere in the presence
of cracks, assuming the material is exposed to this type of environment.
(10) Fabrication characteristics including data verifying the
repeatability of results.
(11) Nondestructive test requirements to be applied to the base
material and joints as appropriate.
(12) Hazards involved in fabrication or use of material with
respect to toxicity or flammability.
3.
MATERIALS PERMITTED. All three classes of materials may be used for
pressure vessel components. However, it is recommended that only Class 1 and
Class 2 materials be considered for Class I pressure vessels. The use of
Class 2 materials requires additional justification to assure high
reliability performance. Even greater justification is required when Class 3
materials are used for Class 1 vessels.
4.
MATERIALS SPECIFICALLY NOT PERMITTED.
The following materials are not
permitted for pressure vessel fabrication:
a. Any Class 2 or Class 3 material which cannot be shown to be
justified under the restrictions imposed by the ASME Code or other Navy
requirements.
b.
Magnesium and magnesium alloys.
c.
Beryllium.
d.
Steel:
ASTM SA-36, SA-283 and SA-515 plate.
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