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MIL-P-60335C (MU)
b.  One reading shall be taken at the approximate
longitudinal middle of the tail cone.
c.  One reading shall be taken at the fin adapter end
within inch from the end of the adapter, but not over the adapter.
A numerical average of the four readings shall be considered as
the hardness of the tail cone.  Observation shall be made for
compliance with the requirements specified.  The test surface
of the tail cone shall be clean, dry, free from scale, pits
and foreign material (such as copper blush) that might crush or
flow under test pressure and so affect the reading.  The tall
cone section shall be adequately supported by an anvil such
that the axis of the penetrator shall be normal to the test
surface area.  Additional procedures to be used shall be in
accordance with Mthd ASTM E18 or Federal Standard 151.  Equipment
used shall be in accordance with 4.3.4.
.
4.4.5 Depth of carburized case of tail cone assembly.-The
remaining half of the tail cone sections used for testing in
accordance with 4.4.4.2 shall be used for this test.  Each one
of the 25 halved sections shall be prepared for cross section
metallurgical examination by polishing and etching one of the
exposed cross sections to such a degree that when using a 20X
Brinell Glass, the line of demarcation between the case and the
cone may be clearly distinguished.  A total of six readings
per tall cone assembly section shall be taken as follows:
A set of readings (constituting both external and
internal case) shall be taken within inch from the edge of the
coupling shoulder, but not on the coupling shoulder.
A set of readings (constituting both external and
internal case) shall be taken within inch from the center
of the tail cone section.
A set of readings (constituting both external and
internal case) shall be taken within inch from the edge of
the adapter, but not over the adapter.
The numerical average of the six readings shall be considered
as the total case depth for the tail cone.  In reading the
individual case depth, read all of the darkened zone that
indicates a difference in carbon from the uniform core structure.
31

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