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3.
Technical Requirements
3.1
Dimensions: Dimensions shall be specified in the
purchase order. Permissible variations in diameter for
finished round product shall be as follows:
| Diameter,
inch |
Permissible
Variations from Diameter, inch |
|
Plus |
Minus |
| 1/8
to 3/8, excl. |
.002 |
.002 |
| 3/8
to 1/2 excl. |
Per Purchase Order |
| 1/2
to 2, incl. |
.006 |
.006 |
Finished
product shall not be out-of-round by more than one-half
the total permissible variations in diameter specified
above. Permissible variations in straightness of finished
products shall be as follows:
| Diameter,
inch |
Permissible
Deviation from Straightness, inch |
| 1/8
to 1/2, excl. |
.045 per
foot of length |
| 1/2
to 2, incl. |
.060 per
foot of length |
Straightness
shall be determined on a calibrated flatness table using
standard techniques. No kinks.
3.2
Cleanliness
A.
In Process - Precautions shall be taken during manufacture
to assure removal of substances that might be deleterious
to use of the finished product for the intended application.
B.
Finished Product - Final cleaning shall be performed
subsequent to performance of all nondestructive examinations.
Materials shall be clean to the extent that no contamination
is visible to the unaided eye, corrected for 20/20 vision,
when viewed under an illumination of at least 100 foot-candles
on the surface being inspected. 4.
Mechanical
Properties
4.1
Tensile Properties. The tensile properties for each
lot shall be provided for information, and shall include
the ultimate tensile strength, the yield strength, percent
elongation, and the percent reduction in area. Tensile
testing shall be done in accordance with the applicable
provisions of ASTM E 8.
4.2
Hardness. The hardness for each lot shall be less
than 170 BHN. Hardness testing shall be done in accordance
with the applicable provisions of ASTM E 92, with the
magnitude of the test load stated in the test report.
5.
Surface Requirements
5.1
Surface Conditions. The finished materials shall
be free from visually detectable cracks, seams, slivers,
blisters, laps, gouges and other injurious imperfections,
and from discontinuities unacceptable to specified nondestructive
examination and tolerance requirements.
5.2
Surface Texture. The surface texture shall be 125
microinch finish (arithmetical average) or better for
specified finished product. In process (or intermediate)
material may be supplied in accordance with standard
supplier practices.
Page
29 of 34 Next
INDEX •
CORROSION RESISTANCE
PROPERTIES • FABRICATION
NIOBIUM
PRODUCTS • SPECIFICATIONS
of NIOBIUM
NIOBIUM ELECTRONICS APPLICATIONS
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