MIL-DTL-46177C(MR)
6.4 Production plates. Material made to this specification has a tendency to
develop stress cracks if not tempered as soon as possible after austenitizing
treatment. To avoid this situation all plates should be left in the hot rolled
or tempered condition while waiting for the ballistic test results.
6.5 Changes in composition. Changes in composition should not necessarily be
cause for retesting but should be subject to review by the procuring activity to
determine whether additional first article testing is required.
6.6 Instructions for potential suppliers. Potential suppliers who have not
previously supplied armor plate to this specification and wish to have their
material ballistically tested, may do so at their own expense. It is recommended
that inquiries for testing be directed to Commander, U.S. Army Test and
Evaluation Command, ATTN: AMSTE-TM-O, Aberdeen Proving Ground, MD 21005.
Technical questions regarding testing may be directed to U.S. Army Aberdeen Test
Center, ATTN: STEAC-LI, Aberdeen Proving Ground, MD 21005.
6.7 Metric units. When required, units for inch, foot, foot-pound, feet per
second, and Fahrenheit may be converted to the metric equivalents by multiplying
them by the following conversion factors:
English unit
Multiply by
Equals
Metric equivalent
inch (in.)
0.0254
=
meter (m)
foot (ft)
0.3048
=
meter (m)
foot-pound (ft-lbf)
1.3558
=
joule (J)
feet per second (ft/s)
0.3048
=
meter per second (m/s)
Fahrenheit (°F)
Centigrade (°C)
t°C = (t°F - 32)/1.8
=
6.8
Definitions.
6.8.1 Blisters. A raised area, often dome shaped, resulting from delamination
under pressure of expanding gas trapped in a metal in a near sub-surface zone.
Very small blisters may be called pinhead blisters or pepper blisters.
6.8.2 Burning. Permanently damaged metal due to overheating enough to cause
incipient melting or intergranular oxidation. Note: This condition is usually
obscured by normal cleaning methods and would require deep pickling and/or
metallography to note the continuous oxidation (chicken wire effect) of the
enlarged grain boundaries.
6.8.3 Checks. Numerous very fine cracks at the surface of a metal part. Checks
may appear during processing or during service and are most often associated with
thermal cycling or thermal treatment. Also called check marks, checking, heat
checks.
6.8.4
Cold shuts.
Freezing of the top surface of an ingot before mold is full.
6.8.5 Contracting officer. The term "contracting officer" means the person
executing a contract on behalf of the Government, and any other officer or
civilian employee who is properly designated contracting officer; and the term
includes, except as otherwise provided, the authorized representative of a
contracting officer acting within the limits of his authority.
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