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MIL-A-46100D (MR)
w/INT. AMENDMENT 2
least 350 F. For plates under one inch thick the tempering process shall be carried out
according to the time schedule listed below, after the plate surface has reached a minimum
temperature of 350 F:
1.00 inch
1 hour minimum
0.75 inch
3/4 hour minimum
0.50 inch
1/2 hour minimum
0.25 inch
1/2 hour minimum
Unless otherwise specified (see 6.2) if a continuous tempering process is used, all plates
shall be tempered for a minimum of one hour for each inch of thickness after the plate
surface has reached a temperature of at least 350F. For plates under one inch thick the
tempering process shall be carried out according to the time schedule listed below, after the
plate surface has reached a minimum temperature of 350F:
1.00 inch
1 hour minimum
0.75 inch
3/4 hour minimum
0.50 inch
1/2 hour minimum
0.25 inch
1/4 hour minimum
The tempering process shall be done as soon as possible after quenching. It is
recommended that the delay after quenching be no greater than 24 hours, see 6.6.
3.2.3 Condition. Unless otherwise specified (see 6.2), plates shall be in the as-heat treated
condition; surfaces shall not be pickled.
3.2.4 Mechanical properties.
3.2.4.1 Hardness. The surface hardness of each plate, including first article samples, shall
be within the range of HB 477 - HB 534. The diameters of Brinell hardness impressions on
any individual plate shall not vary by more than 0.15 mm (see 4.6.2).
3.2.4.2 Impact resistance. The minimum Charpy V-notch impact resistance requirement of
the armor plate shall be as shown in table II. The Charpy V-notch specimens shall be
obtained in both the TL orientation (i.e., transverse to the major direction of rolling with the
notch perpendicular to the plate surface so that the crack shall propagate in the longitudinal
direction) and the LT orientation (i.e., parallel to the major direction of rolling).
3.2.5 Bend test. All bend test samples from that lot shall be capable of being bent to the
requirements below without cracking as determined by either penetrant inspection per
ASTM E1417 or magnetic particle inspection per ASTM E1444. Two bend test samples
shall be tested in the transverse direction per ASTM E290, transverse bend test, at room
temperature through an included angle of 90 (unrestrained) to the inside radii shown
below. After bending, samples shall be free of cracks as determined by either penetrant
inspection per ASTM E1417 or magnetic particle inspection per ASTM E1444.
4

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