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| MIL-W-48230 (PA)
4.3.3 Testing.
4.3.3.1 Hardness Test on Nose - Major Defect.-To in-
sure compliance with the mechanical properties requirements,
each nose casting from a sample shall be subjected to a
hardness test with a Brinell Hardness Tester. The sample,
10 percent minimum representative of extreme furnace envi-
ronment, shall be selected from each heat treat batch when
a batch type furnace is used for final heat treatment.
When a batch type furnace is used for final heat treatment,
the following shall be substituted for a batch. For identi-
fication purposes, any quantity of nose castings, but not
to exceed 4 hours production of the final heat treatment
that have been subjected to final heat treatment in the same
furnace, at the same temperature for the same length of
time or conveyor speed, shall be considered a heat treat-
ment batch. The heat treatment batch thus constituted shall
form the basis for selecting sample castings for the tension
test hereinafter prescribed. The test shall be performed
as specified in 4.4.1, using equipment in accordance with
4.3.4.
4.3.3.2 Tension Test on Nose - Major Defect.-Two (2)
nose castings from each heat treatment batch, one of the
hardest and one of the softest, as determined by 4.3.3.1,
shall be subjected to this test. Failure of one or more
tension test specimens to comply with the physical require-
ments of the applicable drawing shall be cause for rejection
of the batch represented by the specimen. The test shall
be performed as specified in 4.4.2, using equipment in ac-
cordance with 4.3.4.
4.3.3.3 Hardness Test on Body - Major Defect.-To in-
sure compliance with the mechanical properties requirements,
each nose casting from a sample shall be subjected to a
hardness test with a Brinell Hardness Tester. The sample,
10 percent minimum, representative of extreme furnace en-
vironment, shall be selected from each heat treat batch
when a batch type furnace is used for final heat treatment.
When a continuous type furnace is used for final heat treat-
ment, the following shall be substituted for a batch. For
identification purposes, any quantity of body castings, but
not to exceed 4 hours' production of the final heat treat-
ment furnace, that have been subjected to final heat treat-
ment in the same furnace, at the same temperature, for the
same length of time or conveyor speed, shall be considered
a heat treatment batch. The heat treatment batch thus con-
stituted shall form the basis for selecting sample castings
for the tension test hereinafter prescribed. The test
shall be performed as specified in 4.4.3, using equipment
in accordance with 4.3.4.
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