MIL-DTL-46100E (MR)
3.2.10.1.1 Depth of imperfections. The depth of rolled-in scale, scale pitting or snakes shall
not exceed 0.015 inch and shall not reduce the steel thickness below the allowable
minimum. Isolated individual pits over 0.015 inch deep but not over 0.03 inch deep and not
within 6 inches of each other and which do not violate the minimum allowable thickness, as
specified in the applicable drawings and fabrication documents, are acceptable.
3.2.10.2 Internal soundness. One plate from every lot that has an ordered thickness greater
than 0.500 inch shall be ultrasonically examined for internal soundness in accordance with
4.8.6. The acceptance level shall be C, unless otherwise specified in the contract or
purchase order (see 6.2).
3.2.10.3 Edge preparation and quality.
3.2.10.3.1 Plate. Thermal cutting of production plate shall be permitted after final heat
treatment provided the procedure, which may include grinding after thermal cutting, is such
that no cracks develop on any thermally cut edge whether detected by nondestructive
inspection, or as agreed upon in the contract. The heat affected zone of thermally cut plates
(up to and including 0.500 inches in thickness) shall not exceed 1.2 times the plate's
thickness from the cut edge. For plates over 0.500 inches thick, the heat affected zone shall
not exceed 0.625 inches from the cut edge. Approval shall be obtained from the procuring
activity and shall be as specified in the contract or purchase order (see 6.2) in order to have
the heat affected zone exceed these limits. To reduce the potential for plate cracking, plates
shall not be cut by cold shearing after final heat treatment, unless otherwise specified in the
contract or purchase order (see 6.2). For plates that will be cut with a pattern of piece parts
from within the edges of the plate, the condition of the discarded material shall not require
inspection as long as cracks do not infringe into the pattern.
3.2.10.3.2 Piece parts cut from plate. For sections of production plate that are cut to size
for a specific order from the vehicle fabricator, the supplier shall practice such necessary
process controls to prevent edge cracking. For all piece parts, the supplier shall institute
such necessary process inspection such that any cut edges shall comply with the
requirements of 3.2.10.3.2.1.1 and 3.2.10.3.2.1.2 , using magnetic particle inspection, or
liquid penetrant inspection.
3.2.10.3.2.1 Acceptance criteria.
3.2.10.3.2.1.1 Single linear indications. In any four inches of length a single linear
indication shall not exceed twice the plate thickness.
3.2.10.3.2.1.2 Multiple linear indications. Multiple linear indications shall not exceed 1.5
times the plate thickness if two or more lie in the same plane. The total length of
indications in one plane, in any four inch length, shall not exceed twice the plate thickness.
No more than ten indications, whether in one plane or multiple planes, are permitted in any
four inch length.
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