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|  MIL-S-85419 (AS)
shall preclude use of as-forged surfaces unless specific
acceptance is obtained from the approving activity.
h. The mechanical drilling of holes in martensitic steels
after hardening to strength levels of 180,000 psi and above shall
be avoided whenever practicable. When such drilling is
unavoidable, detailed information concerning the processes to be
used shall be submitted to the approving activity for acceptance.
i. Any necessary straightening of parts after heat treatment
to strength levels of 180,000 psi and above shall be accomplished
at the tempering temperature, plus OF (0C minus 50F (28C),
or the parts shall receive a stress-relieving treatment at this
temperature immediately after straightening. Parts shall be
inspected for cracks after straightening.
j. Free-machining grades of steel shall be subject to
acceptance by the approving activity.
3.5.1.3.2 Corrosion-resistant Steels. The following limitations
shall be observed in the selection and application of corrosion
resistant steels.
a. Unstabilized austenitic steels shall not be fusion
welded.
b. precipitation hardening semi-austenitic grades shall not
be used in applications which require extended exposure to
temperatures in the 750-900F (399-482C) range.
c. The use of heat treated 431 or 19-9DL steel shall be
subject to acceptance by the approving activity.
d. The use of 17-4PH stainless steel aged below H1025 shall
be subject to acceptance by the approving activity.
Magnesium or its alloy shall not be
3.5.1.3.3 Magnesium Alloy.
used.
3.5.1.3.4 Castings. Castings shall be in accordance with
MIL-C-6021 and shall be classified Class 1B, Grade C or higher.
Aluminum alloy castings shall be in accordance with MIL-A-21180.
Defects not materially affecting the suitability of the castings
may be repaired at the foundry or during machining by peening,
impregnation, welding, or other methods acceptable to the
procuring activity. Inspection of repaired castings shall be
governed by quality control techniques subject to the acceptance
by the approving activity,
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