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MIL-A-46100D (MR)
w/INT. AMENDMENT 2
6.3 Fabrication. The armor plate covered by this specification is subject to fabrication
involving cutting, drilling, forming, and welding. It is intended that selection and control of
chemical composition, cleanliness, and plate processing will be such that the armor will be
suitable for fabrication in accordance with TACOM code 12479550, TACOM Ground
Combat Vehicle Welding Code-Steel. Copies of this document are available from U.S.
Army Tank-Automotive and Armaments Command, Warren, MI 48397-6000.
6.3.1 Plate cutting. To reduce the potential for plate cracking, it is important that plates
should not be cut by cold shearing after final heat treatment.
6.4 Special first article ballistic test. Special first article ballistic tests are required when the
manufacturer changes either the heat treatment or the declared chemistry of the armor.
6.5 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.
6.6 MIL-STD-367. DELETED.
6.6 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.
6.7 Potential suppliers. Potential suppliers who have not previously supplied armor plate to
MIL-A-46100 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: AMSTE-TO-O, Aberdeen Proving Ground, MD 21005.
6.8 Metric units. When metric dimensions are required, units for inch, foot, foot-pounds
and feet per second may be converted to the metric equivalent by multiplying them by the
following conversion factors:
English
Multiply by
Equals
Metric SI unit
inch
0.0254
=
meter (m)
foot
0.3048
=
meter (m)
foot-lb
1.3558
=
joule (J)
feet/sec
0.3048
=
meter per second (m/s)
Note: Conversion factors can be associated with ASTM E380 entitled "Metric Practice
Guide."
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 (see 6.2). A lead time of 60 days after the contract has
been signed is to be allowed prior to shipment of the first ballistic test(s) to APG to insure
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