MIL-DTL-46177C(MR)
4.4.2.3 For Charpy V-notch impact tests. At least one sample shall be taken
from a plate representing each lot for Charpy V-notch impact tests. The sample
shall be the same thickness as the plate they represent and large enough
to obtain at least two specimens, in each direction, from each sample in
accordance with 4.6.3.
4.4.2.4 For ballistic acceptance samples. Unless otherwise specified in the
contract or order (see 6.2), one test plate shall be submitted from each lot.
The minimum plate size shall be l2 x 36 inches. Unless otherwise specified, the
average thickness of each test plate shall be determined by taking the average of
four thickness measurements. One measurement shall be taken along each edge at a
distance of at least l inch from the edge. Thickness measurements for plates
shall be read to the nearest 0.00l inch. If a producer submits plates outside
the specified plate tolerances (see table II), the procuring activity shall be
notified.
4.4.2.5 Bend test samples. Unless otherwise specified (see 6.2), two samples
shall be randomly taken from each lot for these tests representing the entire lot
of material; however, when an entire heat represents only one lot the samples
shall be taken from the first and last usable portion of the heat. Testing shall
be conducted in accordance with 4.6.7 and shall meet the requirements of 3.2.5.3.
4.5
Examination.
4.5.l Visual. All steel plate shall be subject to visual inspection for
compliance with the requirements for surface conditions (see 3.2.l1.1), edge
quality (see 3.2.11.2 and 3.2.11.3) and identification marking (see 3.2.8).
4.5.2 Dimensional. All steel plates shall be subject to inspection for
compliance with dimensional and tolerance requirements (see 3.2.7).
4.5.3 Preparation for shipment. Examination shall be made to determine
compliance with the requirements for preparation for shipment (see section 5).
4.6
Tests.
4.6.l Chemical analysis. Chemical analysis shall be conducted in accordance
with the applicable method specified in ASTM A751 (see 6.5). The analysis shall
comply with the declared composition established in accordance with the
requirements of table I (see 3.2.2).
4.6.2 Hardness test. The Rockwell hardness or the Brinell hardness test shall
be conducted in accordance with ASTM E10 or ASTM E18 or ASTM E110 as applicable.
Two readings shall be taken at diagonal corners on one plate surface only.
Surface scale and decarburization shall be removed from the areas where the tests
are to be made.
4.6.3 Charpy V-notch impact tests. At least two Charpy V-notch impact test
specimens shall be taken from each sample and shall be prepared and tested in
accordance with ASTM E23. Charpy V-notch impact test specimens shall be taken in
both the TL orientation and in the LT orientation from locations midway between
the top and bottom surfaces of the plate and at least 4 inches or 2T, whichever
is less, from any quenched edge as well as outside the heat affected zone of any
oxygen-cut edge. The largest attainable subsize Charpy V-notch impact specimens
shown in figure 4 of ASTM E23 shall be used.
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