MIL-DTL-22606D(SH)
4.2.1.1 Formed ends and neck examination. Integrally formed ends and necks of each flask shall be visually
examined for surface cracks. Surface discontinuities such as blemishes, scale marks, chip marks, hammer marks,
folds, seams, and scale that would not be considered cracks and would not be rejectable in the cylindrical section
also would not be considered cracks and would not be rejectable on the integrally formed ends and necks. Flasks
submitted under the wall thickness exception of 3.2.1.1 will be accepted provided:
a.
All visible forging folds on the inside surface are ground out.
b. Irregularities on the outside surface in the transition region, such as from chipping or hammering, are
ground out.
c.
The final thickness measurement is performed after such grinding.
Flasks containing visual conditions other than those described above shall not be offered for delivery without
approval of the contracting authority.
4.2.2 Dimensional examination. After grit blasting of the outside surface to remove heat treat scale, but before
painting, the flask dimensions shall be measured. The flask diameter shall be measured using wrap tape or other
suitable tool near the center of the flask. Flask out of roundness shall be determined by micrometers, calipers, or
other suitable tools. Wall thickness shall be determined at all outside and inside surface ground or machined repair
areas by ultrasonic inspection in accordance with T9074-AS-GIB-010/271. The flask length shall be measured after
final machining of the nozzle faces but before installation of the end plugs.
4.2.3 Oil-free examination. Each flask interior and each end plug shall be inspected with an ultraviolet light
having a wave length of 3600 to 3900 angstroms. Any evidence of fluorescence on the flask interior, flask threaded
surfaces, or on the end plug will constitute failure of the examination for the item examined.
4.3 Tests. The following tests shall be performed on each test sample or flask as specified herein.
4.3.1 Chemical analysis. Prior to flask fabrication, the producing mill shall take a sample from a pipe or billet
of each heat of steel to be used for flask fabrication and the sample shall be subjected to a chemical analysis to
determine compliance with 3.1.2 and 3.1.3. Sample selection and testing shall conform to ASTM E1282. Failure of
the chemical analysis to conform to specified material check analysis limits shall be cause for rejection of the heat of
material represented.
4.3.2 Mechanical tests.
4.3.2.1 Yield and tensile (applicable to all steel grades). Four test specimens (see 4.1.2.1, 4.1.2.2, and 4.1.2.3)
from each lot shall be tested in accordance with ASTM E8/E8M to determine compliance with the yield, tensile, and
elongation properties specified in table II and III. Failure to pass the test shall be cause for rejection of the flask or
plug lot represented by the test specimens.
4.3.2.2 Charpy test. Three Charpy V-notch test specimens (see 4.1.2.1 and 4.1.2.2) from each lot shall be
tested in accordance with ASTM E23 to determine conformance to table II. The average of the three test specimen
Charpy V-notch values recorded during the test shall not be less than the value specified in table II. In addition, no
single specimen Charpy V-notch value shall be less than 5 foot-pounds below the value specified in table II. Failure
to pass the test shall be cause for rejection of the flask lot represented by the test specimens.
4.3.2.3 Brinell hardness testing (flasks). Each flask cylindrical section shall be Brinell hardness tested in
accordance with ASTM E10. A minimum of two readings shall be obtained. Readings shall be taken at each end
and shall be located 180 degrees apart.
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