MIL-DTL-46177C(MR)
3.2
Acceptance requirements.
3.2.1
Materials.
3.2.1.1 Structure. Processes of manufacture shall be such as to produce steel
plate having, as nearly as practicable, a homogeneous structure throughout.
3.2.2 Chemical composition. The heat analysis of all plates within a heat shall
conform to the requirements of table I unless otherwise negotiated between the
steel supplier and the contractor. In addition, those additives or hardening
agents intentionally added shall be declared. All limits as specified in table I
(including any deviations negotiated) shall be submitted in advance to the
procuring activity. The contractor may establish and submit separate limits for
each thickness of plate to be furnished (see 6.5). A statement showing the
product analysis of each melt and complete details of the heat treatment of each
lot shall be furnished to the procuring activity at no cost to the procuring
activity. All elements of chemical composition shall be shown in the statement.
The chemical composition range established by the producer and the chemical
analysis of the material submitted shall be reported to the procuring activity.
Also, some methods of sulfide shape control shall be used.
3.2.3 Heat treatment. All plates in each lot, including samples, shall receive
the same heat treatment except for such variations in tempering temperature as may
be necessary to produce the prescribed hardness. The austenitizing temperature for
production plates may vary within a range of 50°F above the temperature used for
test plates, but in no case shall it exceed l700°F (see 6.4).
3.2.4
Processing controls.
3.2.4.l Heating. Except for heating the plates below 450°F, local or general
heating shall not be performed after the final quenching and tempering operation
unless otherwise specified in the contract or order. A detailed outline of the
procedure to be used in each operation of the following processes shall be
submitted in writing to the procuring activity for authorization (see 6.2).
3.2.4.1.1 Edge preparation. Thermal cutting shall be permitted after final heat
treatment provided the procedure is such that no cracks develop on any thermal
cut edge.
3.2.4.1.2 Repairing. Unless otherwise approved by the procuring activity, weld
repairs shall not be made on any plates. When permitted, weld repair shall be
done prior to hardening treatment whenever possible (see 6.2).
3.2.4.1.3 Forming. After final quenching and tempering operations the plate
material shall meet the bend test requirements as specified in 3.2.5.3.
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