MIL-DTL-12560K (MR)
4.7 Examination.
4.7.1 Visual. All steel plate shall be subject to visual inspection for compliance with the
requirements for surface conditions (see 3.2.12 .1), edge quality (see 3.2.12.3 and 3.2.12.4) and
identification marking (see 3.2.10).
4.7.2 Dimensions. All steel plates shall be subject to inspection for compliance with dimensional
and tolerance requirements (3.2.8). Each class 3 armor plate shall divided into one foot squares
painted on one surface and the results of each thickness measurement shall be painted in the
square in which it was taken.
4.7.3 Ultrasonic examination.
4.7.3.1 Inspection equipment. The ultrasonic soundness inspection equipment shall conform to
ASTM A578/A578M.
4.7.3.2 Procedure. Unless otherwise specified (see 6.2), the ultrasonic examination shall be
carried out in accordance with ASTM A578/A578M with the following exceptions.
(a)
Scanning shall be continuous over 100% of the plate surface.
(b)
Scanning rate shall be at a speed where recordable discontinuities can be detected.
(c)
The testing frequency shall be a minimum of 2 megahertz (MHz).
(d)
Any area within a plate where a discontinuity produces a continuous total loss of
back reflection accompanied by continuous indications on the same plane that
cannot be encompassed within a circle whose diameter is 1 inch shall be cause for
rejection of that plate.
4.7.3.3 Certification of inspection personnel. Unless otherwise specified in the contract or
purchase order (see 6.2), personnel performing ultrasonic inspection shall comply with the
qualification requirements of ISO 9712. Personnel making accept/reject decisions in accordance
with the process described by this specification shall be qualified to at least a level II (See
6.3.19).
4.8 Tests.
4.8.1 Chemical analysis. Chemical analysis shall be conducted in accordance with the applicable
method specified in ASTM A751 (see 6.4). The analysis shall comply with the declared
composition established in accordance with the requirement of Table I (see 3.2.1).
4.8.2 Hardness tests. Brinell hardness tests shall be conducted in accordance with either ASTM
E10 or ASTM E110, using a 10 mm carbide ball and a 3000 kilogram load. Surface scale and
decarburization shall be removed from the areas where the tests are to be made. However, no
more than 0.040 inches shall be removed from the test area. Test area is exempt from thickness
tolerance requirement. All hardness readings shall fall within the requirement for the thickness
as specified in Table II.
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