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|  3.
3.1 Type of steel. The steal shall be produced from fully killed steel to
which sufficient aluminum
been added to produce a fine austenitfc grain.
3.2 Chemical composition.
composition of the steel may
ordered
to identification numbers or applicable ranges. or maximum or minimum limits
6 . 1 a n d 5 . 2 ) . The supplier shall submit a chemical analysis of each heat
of steel to the procuring activity.
3.2.1 Product analysis. The chemical composition, as determined by product
analysis, shall meet the
for the specified composition provided
that in a heat of steel the individual tolerances do not vary from above and
below the ranges shown for product analysis tolerances in FED-STD-66. This
product analysis, if required shall be preformed by the producer.
Mechanical properties.
3.3.1 Hardness. The steel, hardened and tempered, shall meet the hardness
requirements specified on drawings or in the invitation for bids, contract, or
order
6.1). Specified hardness ranges shall be as shown in table I
unless otherwise negotiated between the supplier and the procuring activity.
3.3.2 Tensile strength (0.006 inch
thick and under).
strength shall
as shown in table I.
3.3.3 Cold bending, If the strip is
to other than minor bending,
the requirements, limits and
of conducting the bend test shall be
negotiated between the contractor and procuring activity.
The maximum
depth
total and partial
3.4
of the strip shall be 0.001 inch
or
the
thickness of the strip, whichever depth is greater,
3.5
Unless otherwise specified in the invitation for bids,
contract, or order, strip shall be furnished with a scaleless tempered finish
(see 6.1 and 6.3).
3.6
The strip shall be furnished with a No. 1 edge
accordance
with
free from
cracks, and excessive burrs.
Dimensions. The strip shall be furnished in the sizes as specified in
the invitation for bids, contract, or order (see 6.1). Tolerances
specified dimensions shall be as shown
accordance with tables 5, 6, 9 and
10 of
or ASTM
for
to a Number 1 edge.
No flatness
have been formulated and, when required, flatness
tolerances for specified sizes should be negotiated between the supplier and
the procuring activity.
3.8 Identification
Unless otherwise specified in the contract or
order see
strip in coils or bundles of cut lengths shall have the
name or trademark, the specification number and type legibly
imprinted on oilproof, waterproof tags. One tag shall be attached to each
or
3
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