MIL-DTL-12560K (MR)
3.2.9 Identification marking. Identification marking and records shall be such as to ensure
positive identification of all plates, including test samples and specimens, with the lot and
corresponding heat from which they were produced. The primary plate rolling direction shall be
identified.
3.2.9.1 Class 3 armor plate identification marking. Manufacturers supplying class 3 armor plate
are additionally required to:
a. Mark each class 3 plate with one foot square blocks showing thickness at the center
of each block. The acceptance of each plate shall be based on these measurements
meeting the thickness requirements set forth in Table III.
b. Label each plate "RHA, class 3, MIL-A-12560, plate No. ____, heat No.____."
Labeling shall be approximately 1/2 inch high letters. Location of labeling for all
plates shall be in the upper right hand corner.
First article and acceptance ballistic test
3.2.9.2 Ballistic test plate identification marking.
plates shall also be marked with unique melt and slab, the manufacture's name or trademark, the
number and class of this specification, and the ordered plate thickness in inches. First article
plates shall be marked "PRE," acceptance plates "ACC," and retest plates shall be marked "R1"
and "R2." If a second set of retest plates are submitted they shall be marked "RR1" and "RR2."
All plate markings shall be approximately 1/2 inch high letters and highlighted with a highly
visible paint. The primary plate rolling direction shall be identified.
3.2.10 Information required. A statement showing the product analysis of each melt and
complete details of the heat treatment of each lot shall be furnished for the files of the procuring
activity in addition to the completed Rolled Homogeneous Armor (RHA) Test Data Form (see
Figure 1). All elements of the chemical composition shall be shown in the statement, including
special additives or hardening agents, whether shown in Table I or not.
3.2.11 Workmanship.
3.2.11.1 Surface imperfections. When specified in the contract or purchase order (see 6.2),
plates shall be inspected for surface imperfections in the de-scaled condition, only. The top and
bottom surface of each plate shall be free from the following surface defects: slivers, laps,
checks, seams, blisters, snakes, cold shuts, cracks, burning, and laminations (see 6.3).
Imperfections listed above which are of such nature as to affect the fabrication of the material,
are rejectable.
3.2.11.1.1 Depth of imperfections. The depth of rolled-in scale, scale pitting, mechanical gouges,
or snakes shall not exceed 0.015 inch and shall not reduce the steel thickness below the
allowable minimum. Isolated individual pits over 0.015 inch deep and not within 6 inches of
each other and which do not violate the minimum allowable thickness, as specified in Table III
or the applicable drawings and fabrication documents, are acceptable. Additionally, if isolated
individual pits do not lie within 4 feet of each other and have a depth of less than 4% of ordered
gage, and less than 0.25 inch in diameter, are acceptable.
3.2.11.2 Edge preparation. Thermal cutting shall be permitted after final heat treatment provided
the procedure, which may include grinding after thermal cutting, is such that no cracks develop
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