MIL-DTL-46177C(MR)
4.2.1.1.1 First article tests.
First article tests shall consist of all the
tests specified in 4.6.
4.2.1.1.2 Waving of first article ballistic test. Unless otherwise specified
(see 3.1 and 6.2), the first article ballistic test may be waived at the
discretion of the procuring activity if the manufacturer within 37 months has
produced acceptable plates, provided also that production conditions are the same
as for previously accepted plates. When a supplier has previously met the first
article requirements he will furnish the procuring agency with the pertinent data
relative to compliance with first article tests.
4.2.1.2 Quality conformance (acceptance) inspection. The acceptance examination
under 4.5 and the tests under 4.6 shall serve as a basis for the acceptance of
individual production lots.
4.3 Lot. A lot shall consist of all production and ballistic test plates of the
same melt of steel, of the same thickness, having the same treatment, and heat
treated in the same thermal cycle in the same production furnace(s) in the same
facility. When specified by the procuring activity, (see 4.3.1), production and
ballistic test plates may be allowed to be heat treated separately. The test
plate shall be heat treated in a production furnace.
4.3.1 Separately heat treated ballistic test plates. When the procuring
activity allows a ballistic test plate to be heat treated separately from the
production plates it represents, it shall be so stated in the data to be supplied
in accordance with MIL-STD-662 (see 6.2 and 6.4).
4.4
Sampling.
4.4.l First article sampling. The number and sizes of test plates and samples
for first article testing and examination shall be as follows: 3 ballistic test
plates l2 x 36 inches x 0.l875 inch thick to represent plates in the ordered
thickness range of 0.125 to less than 0.250 inch.
4.4.1.1 Chemical composition. Sample for chemical analysis shall be taken from
each plate selected for the ballistic tests.
4.4.1.2 Impact samples. At least one impact test sample shall be taken from
each submitted test plate in accordance with 4.6.3 and each plate shall consist
of enough material for four (4) impact specimens.
4.4.1.3 Bend test samples. Unless otherwise specified (see 6.2), two (2)
samples shall be taken from each submitted test plate and shall be tested in
accordance with 4.6.7 and shall meet the requirements of 3.2.5.3.
4.4.2
Sampling for acceptance tests.
4.4.2.l For chemical analysis. At least one sample for chemical analysis shall
be taken from each heat in accordance with the applicable method specified in
ASTM A751 (see 6.5).
4.4.2.2 For hardness tests. Each plate in each lot shall be tested in at least
two places on one face for hardness in accordance with 4.6.2.
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