Depth of carburized case of tail cone assembly

Page Title: Depth of carburized case of tail cone assembly
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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.

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