MIL-DTL-45225F(MR)
3.
REQUIREMENTS
3.1 First article. When specified in the contract or purchase order (see 6.2)
and before production has commenced, samples of the specified item shall be made
available to the contracting officer or his authorized representative for
approval 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 and test forgings shall be manufactured
by the process proposed for use on production.
3.2 Chemical composition. Chemical composition of type I forgings shall be
within the limits shown in table I. Type II material shall be as specified in
the contract or on the drawings.
3.3 Mechanical properties. Unless otherwise specified (see 6.2), the mechanical
properties of type I forgings shall meet the requirements of table II, when tests
are conducted as specified in 4.8.2. Type II forgings shall meet the mechanical
property requirements specified in the contract or on the drawing. If mechanical
properties different from the values shown in table II or any other properties
are required, the ballistic requirements must then be negotiated (see 3.4).
3.4 Ballistic requirements. Each ballistic test forging shall be proof fired
for resistance to penetration by determining a ballistic limit protection,
BL(P), at 0o obliquity. The minimum required ballistic limit for type I, class
A material shall be determined from the values shown in tables V, VI, VII and
VIII. The minimum required ballistic limit for type I, class B material, and
type II materials shall be determined from the values shown in tables IX, X, XI,
XII and XIII. In those cases where the BL(P) is within + 10 fps of the minimum
required value for the measured average thickness (to the nearest 0.005 inch),
an interpolation of the appropriate table will be performed. The average plate
thickness, computed to the nearest 0.001 inch, will be used to determine the
minimum required ballistic limit.
3.5
Thermal processing, type I.
3.5.1 Class A. After final strain hardening performed during the forging
process, any thermal processing exceeding 200oF performed on the forging,
excluding fabrication by welding, will necessitate re-verification for
conformance with 3.3 and 3.4. Deviation from this requirement shall be subject
to review and approval by the procuring activity.
3.5.2 Class B. Heat treatment shall be such that the material shall meet the
requirements of this specification.
3.6 Dimensional tolerances. The forgings shall conform to the shape and
dimensions specified on the drawings within any variations stated herein.
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