UFC 4-390-01
23 July 2003
For pressure vessels and other structural materials, the
applicant should submit the same information that is required for
Category 2 material. In addition, as justification for the use
of a Category 3 material, formal test data should be provided to
the SCA covering, as a minimum, the following information:
a)
Basic process to be used in producing the material.
Sufficient information is required to demonstrate that the
process results in reproducible material properties.
b)
Effect of flaws, such as cracks, inclusions and
porosity, on material performance.
c)
Effects of temperature on material performance and on
crack propagation rate.
d)
Results of destructive tests of samples fabricated from
the material and comparison of these results with the
design basis predictions of the failure point.
e)
Results of nondestructive test requirements applied to
the base material and joints as appropriate.
f)
Results of fatigue testing based on operating pressure
differentials and external loading.
g)
Hazards involved in fabrication or use of the material
with respect to flammability.
h)
Additional testing or information as required by the
SCA.
Should the designer choose to use Category 3 materials for
purposes other than as structural pressure vessel components,
fully documented technical justification will be required. As a
minimum, the applicant should submit the information required in
paragraph A.3 plus additional information as may be required by
the SCA to justify the use of Category 3 material or components.
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