MIL-DTL-46083D(MR)
in accordance with 4.3.1. The approval of the first article samples authorizes
the commencement of production but does not relieve the supplier of responsibility
for compliance with all applicable provisions of this specification. The first
article samples shall be manufactured by the process proposed for use on
production.
3.1.1 Change in mill processing. After an armor material has successfully
complied with the requirements of this specification, any deliberate change in
the mill processing by the manufacturer shall be drawn to the attention of the
procuring activity and the contractor. If the material processing is changed,
the first article tests of this specification may be again called upon to
assure compliance with the requirements of this specification.
3.2 Chemical composition. The chemical composition limits for class I and
class II materials shall be within the limits shown in table I (see 6.2).
TABLE I.
Chemical composition limits, (weight percent).
_____________________________________________________________________________________________________________
Sili-
Class
Alloy
con
Iron Copper Manganese Magnesium
Chromium
Zinc
Titanium
Others, max. Aluminum
max. max.
Each
Total
______________________________________________________________________________________________________________
I
5083
0.40 0.40 0.10a/
0.40-1.0
4.0-4.9
0.05-0.25 0.25a/
0.15a/
0.05
0.15
Rem.
5456
0.25 0.40 0.10a/
0.50-1.0
4.7-5.5
0.05-0.20 0.25a/
0.20a/
0.05
0.15
Rem.
II
7039
0.30 0.40 0.10a/
0.10-0.40 2.3-3.3
0.15-0.25 3.5-4.5 0.10a/
0.05
0.15
Rem.
2219
0.20 0.30 5.8-6.8 0.20-0.40 0.02a/
--
0.10a/
0.02-0.10
b/
0.15
Rem.
________________________________________________________________________________________
a/Maximum
b/Zirconium
0.10-0.25
Vanadium
0.05-0.15
Others
each 0.05 max.
3.3 Mechanical properties. Unless otherwise specified (see 6.2), the
mechanical properties of class I and class II extrusions shall meet the
requirements of table II, when tested in accordance with 4.6.2.
Mechanical properties.a/
TABLE II.
____________________________________________________________________________________
Yield
Tensile
strength
Direction of
Thickness,
strength
0.2% offset
Elongation
Class
specimen
inches
min. psi
min. psi
min. percent
I
Longitudinal
Up to 2.000, incl
45,000
35,000
9
II
Longitudinal
Up to 2.000, incl
57,000
48,000
8______
a/ See 6.5 and 6.6
3.4 Ballistic requirements. Each ballistic test extrusion shall be proof
fired for resistance to penetration by determining a protection ballistic
limit, BL(P), at 0° obliquity. The minimum required ballistic limit for class I
materials shall be determined from the values shown in tables A-I, A-II and
A-III. The minimum required ballistic limit for class II materials shall be
determined from the values shown in tables A-IV, A-V, A-VI and A-VII.
3
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