MIL-DTL-12235A (MR)
3.1.1.1.1 Processing. The composition and heat treatment, when required, shall be at the option
of the contractor and shall be specified in the contract or purchase order (see 6.2) when the
projectile body meets the hardness requirements of this specification.
3.1.1.1.2 Statement of analysis. The chemical analysis of steel shall be furnished with each lot
of projectiles supplied.
3.1.1.2 Steel quality. The quality of the steel used in projectiles, as indicated by the results of
macroetch test performed in accordance with 4.4.4.1, shall be as indicated in the contract or
purchase order (see 6.2). Prior requirements indicated that the macrograph had to be equal to or
better than that shown by macrographs A4, B5, and C8 of Appendix A and defects of the types
shown by macrographs D3, D4, D5, D6, D7, or D8 of Appendix A. These macrographs were
taken from the cancelled MIL-STD-1459 and they are offered as possible requirements. It is
suggested that the ASTM Adjunct of ASTM E381; Plate I, Plate II, and Plate III be referenced in
the contract or purchase order as possible accept / reject criteria.
TABLE III. Proofing-projectile drawings.
PROOFING-
STEEL
ALUMINUM
PROJECTILE
Hot-Rolled, As-Rolled
M1000
N/A
FS 1021
Hot-Rolled, As-Rolled
M1001
N/A
FS 1021
M1001A
N/A
Alloy 1100 Temper 0
Hot-Rolled, As-Rolled
M1002
N/A
FS 1021
M1002A
N/A
Alloy 1100 Temper 0
Hot-Rolled
M1003
N/A
FS 1021
Cold Rolled
M1004
N/A
FS 1021
Hot-Rolled
M1005
N/A
FS 1009 to FS 1020
3.1.1.3 Hardness. The hardness of the finished steel projectiles shall be within a range of 64 to
74 Rockwell B (100 to 122 BHN), when tested as prescribed in paragraph 4.3.4.2 (See 6.3).
3.1.1.4 Rotating band.
3.1.1.4.1 Cleaning before assembly. Prior to banding, the band seats shall be clean and free
from oil, grease, dirt, rust, and foreign material. Shot blasting or sand blasting shall not be used
for cleaning band seats.
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