 |
|||
|
|
|||
| ||||||||||
|
|  MIL-S-81054A(OS)
4.3.1 Preproduction samples. The preproduction samples of steel bars
and forgings (specified in the contract or purchase order) shall be manu-
factured in accordance with 3,1 and 3,3, and shall be subjected to the
tests detailed in 4.4 at an activity designated by the procuring activity
Acceptance of the preproduction sample shall be based on no defects in
the sample.
4.3.1.1 Chemical analysis. A minimum of one sample for chemical
analysis shall be taken from each heat of steel represented in the
forgings or bars, Samples shall be taken from any point midway between
the surface and center of solid forgings or bars or forging stock where
the sections exceed 1-1/2 inches, or at any point midway between the
inner and outer surfaces of the wall of hollow forgings, For forgings
or bars or forging stock where sections are 1-1/2 inches or less, samples
shall be taken by drilling entirely through the material, the surface
drillings being discarded, Upon approval of the procuring activity,
samples may be taken from broken tensile specimens, Each sample shall
consist of not less than 2 ounces of material. Samples for chemical
analysis may be waived, at the discretion of the procuring activity,
provided that all the material under inspection can be identified as
being made from a heat or heats previously analyzed and found to be in
accordance with requirements of the respective material specification.
4.3.1.2 Ultrasonic inspection. Unless otherwise authorized by the
procuring activity, each grade A forging shall be ultrasonically inspected
in accordance with MIL-U-81055.
4.3.1.3 Grain flow, After the forging technique has been established,
one forging (grades A and B only) shall be selected to represent grain
flow. If the forging practice is altered, one additional forging shall
be submitted for each change in forging practice.
4.3.1.4 Impact. For grade A forgings, three or more samples repre-
senting each heat of steel submitted for acceptance shall be selected for
impact testing.
4.3.1.5 Grain size. One or more samples shall be selected from each
heat of steel represented in a shipment.
4.3.1.6 Decarburization. One or more samples shall be selected from
each processing condition for decarburization testing.
11
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals