MIL-DTL-46177C(MR)
3.2.4.2 Grinding. Grinding is not required but may be performed to remove minor
defects not affecting the serviceability of the material provided that, unless
otherwise authorized by the procuring activity, the grinding does not result in
the reduction of the plate thickness in the ground areas to less than the
tolerances specified in table II.
TABLE II. Thickness tolerances for ordered thickness,
inches (over and under).
_______________________________________________________________________________
Tolerance (inch) for width of plate
_______________________________________________________________________________
Specified thickness
Up to
72" to
84" to
96" to
l08" to
inch
72"
84" excl.
96" excl.
l08" excl.
120" incl.
_______________________________________________________________________________
l/8 to less than l/4
.0l6
.0l6
.0l9
.0l9
.023
_______________________________________________________________________________
3.2.5
Mechanical properties.
3.2.5.l Hardness. The average surface hardness of each plate including first
article samples shall be within the range of Rockwell hardness (HRC) of 39 to 43
or Brinell hardness (HB) of 362 to 400 when tested in accordance with 4.6.2.
3.2.5.2 Impact resistance. The minimum Charpy V-notch impact resistance
requirement of the armor plate shall be as shown in table III. The Charpy V-notch
impact specimens shall be obtained in both the TL orientation (transverse to the
major direction of rolling with the notch perpendicular to the plate surface so
that the crack will propagate in the longitudinal direction) and the LT
orientation (parallel to the major direction of rolling).
3.2.5.3 Bend test. All bend test samples from a given lot shall be capable of
being bent to the requirements below without cracking. Two bend test samples shall
be tested in the transverse direction per ASTM E290, at room temperature through an
included angle of 90 degrees (unrestrained) to the inside radii shown below. After
bending, samples shall be free of cracks as determined by either liquid penetrant
inspection per ASTM E1417 or magnetic particle inspection per ASTM E1444.
Plate thickness (T)
Inside Radius
1/8 to 1/4 inches
4T
3.2.6 Ballistic requirements. Ballistic requirements shall be in accordance
with the appendix of this specification.
3.2.7
Dimensions and tolerances.
3.2.7.l Dimensions. Plates shall comply with the dimensions specified on the
applicable drawings or in the contract or order (see 6.2).
3.2.7.2 Thickness. The thickness tolerance of each plate, after final
treatment, shall be in accordance with table II for the width specified.
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business