MIL-DTL-32505
TABLE I. Chemical composition, weight percent. 1/
Class II
Class I
7017 ALLOY 2/
7020 ALLOY 2/
ELEMENTS
SYMBOL
Silicon
Si
0.35
0.35
Iron
Fe
0.45
0.40
Copper
Cu
0.20
0.20
Manganese
Mn
0.05 - 0.50
0.05 0.50
Magnesium
Mg
2.0 - 3.0
1.0 - 1.4
Chromium
Cr
0.35
0.10 0.35
Nickel
Ni
0.10
N/A
Zinc
Zn
4.0 5.2
4.0 - 5.0
Titanium
Ti
0.15
N/A
Zirconium
Zr
0.10 0.25
0.08 0.20
Other, min
(Mn + Cr)
0.15
N/A
Other
(Zr + Ti)
N/A
0.08 0.25
Other, max. Each
---
0.05
0.05
Other, max. Total 3/
---
0.15
0.15
Aluminum
Al
Remainder
Remainder
1/
Except for "Aluminum" and "others", analysis normally is made for elements for which specific limits are shown.
2/
Where single units are shown, except for [(Mn + Cr)] these indicate the maximum amounts permitted.
3/
The sum of those "others" metallic elements equaling 0.010 percent or more for each, shall be expressed to the second
decimal before determining the sum.
3.4 Weldability. The vehicle fabricator (OEMs and kit manufacturers, etc.) are required to
demonstrate weldability (which includes ballistic shock testing) for armor to armor and armor to
non-armor applications in accordance with the Ground Combat Vehicle Welding Code (GCVWC) -
Aluminum #19207-12472301. Since the alloys referenced by this specification are not specified in
the GCVWC 12472301 or in the revised Military Standard for Weldability of Aluminum Alloys
(MIL-STD-1946) it is strongly suggested that the contract or drawing for the vehicle specify
weldability requirements as outlined in paragraph 6.3. Aluminum fabricators shall qualify a weld
procedure for any new armor material being used for armor applications and this requires ballistic
shock testing. This requirement (ballistic shock testing and the associated striking velocities) are
listed in Appendix A and shall also be specified in the contract or drawing for the vehicle, if the
alloys specified by this specification are to be welded at the following thicknesses; Class I material
in the thicknesses of 1.000" and 1.500" and Class II material in the thicknesses of (to be
determined).
3.5 Ballistic limit. The protection ballistic limit, BL(P), shall be as specified in Appendix B.
When a complete penetration cannot be obtained for any class of armor material, the following rule
shall be in effect until a new ballistic acceptance round can be developed and utilized. When the
ballistic velocities of four (4) partial penetrations are above the minimum ballistic requirement for
the specific thickness, the material shall be certified as acceptable with a V50 (which obviously
cannot be explicitly determined) above the minimum requirement.
4
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