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MIL-A-12560H (MR)
w/INT. AMENDMENT 4
methods and would require deep pickling and/or metallography to note the continuous oxidation
(chicken wire effect) of the enlarged grain boundaries.
6.4.14 Lamination. A type of discontinuity with separation or weakness generally aligned
parallel to direction of the worked surface of the metal and may be the result of pipe, blisters,
seams, inclusions, or segregation; elongated and made directional by working.
6.4.15 Pit. A cavity or depressed area on the surface of a plate.
6.4.16 Linear indication. For nondestructive examination purposes, a linear indication is
evidence of a discontinuity that requires interpretation to determine its significance.
6.5 Changes in composition. Changes in composition may 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 Chemical analysis. Suggested ASTM instrumental methods that can be used for chemical
analysis are E322 and E415. ASTM A751 should be consulted for a complete list of methods.
6.7 MIL-STD-367. DELETED.
6.7 Production plates. Material made to this specification has 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.
6.8 Potential suppliers. Potential suppliers who have not previously supplied armor plate to MIL-
A-12560 and wish to have their material ballistic tested may do so at their own expense. It is
recommended that inquiries for such testing be directed to Commander, US Army CSTA,
ATTN: STECS-LI-A, Aberdeen Proving Ground, MD 21005-5059.
6.9 New contracts sponsored by Government agencies. At the time that a new contract is
initiated for the production of combat vehicles, the contractor's supplier is to estimate the
number, size and delivery schedule of the ballistic test plates which are to be submitted for first
article or acceptance testing. A lead time of 60 days after the contract has been signed is to be
allowed prior to shipment of the first ballistic test plate(s) to APG to insure that all administrative
functions for the establishment of a new TECOM project have been completed in preparation for
the test. The contracting government agency is to initiate the new project through a letter to
Commander, US Army TECOM, ATTN: AMSTE-TA-O, APG, MD 21005-5055 requesting a
cost estimate for the ballistic testing of the applicable number of sizes of plates. In the case of
increases in scope of existing projects, similar correspondence is needed.
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