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3.4
Bend Ductility. Representative samples of the materials
in final form shall withstand the following bend test
at room temperatures without failure when tested according
to procedures described in the most recent revision
of the Materials Advisory Board report MAB-216-M, "Evaluation
Test Methods for Refractory Metal Sheet Materials."
The samples shall be sectioned with the long axis of
the bend specimens perpendicular to the final rolling
direction.
3.4.1
Sheet 0.060" in thickness and under shall be bent over
a 1T radius through 105 degrees at a ram speed of one
inch/per minute.
3.4.2
Sheet over 0.060" to 0.187" in thickness shall be bent
over a 1T radius through 105 degrees at a ram speed
of one inch/per minute.
3.5
Grain Size. Unless otherwise specified, the minimum
average ASTM grain size number shall be in accordance
with Table IV.
Table
IV.
| Thickness |
C-1O3 |
C-129Y |
Nb-1Zr |
Cb-752 |
| .006-.150" |
6 |
6 |
5 |
6 |
| .151-.500" |
5 |
5 |
4 |
5 |
| Greater than .750" |
--- |
--- |
--- |
--- |
4
Dimensions and Tolerances
4.1
Dimensions and Tolerances. Unless otherwise specified,
tolerances shall be as defined in AMS 2242.
4.2
Flatness. Total deviation from flatness of sheet and
strip shall not exceed 6% as determined by the following
formula: H/L X 100 = percent of flatness deviation.
where H = maximum distance from a flat reference deviation.
and L = minimum distance from this point to the point
of contact with the reference surface.
4.3
Marking for Identification. Each plate, sheet, and
strip shall be suitably marked with the contract number
or order number, ingot melt number, specification number,
and composition number.
5.
Quality
5.1 General. The finished product shall be visibly
free from oxide or scale of any nature, grease, oil
residual lubricants, and other extraneous materials.
Cracks, laps, seams, gouges, and fins shall be unacceptable.
5.2 Surface Rework. All surface pores, gouges,
and other defects deeper than 0.005" or 3% of the thickness,
whichever is smaller, shall be unacceptable. Sunace
imperfections may be faired smooth to remove any notch
effect provided dimensional tolerances are still maintained.
5.3
Edge. The edges shall be produced by shearing, slitting
or sawing. The burr height shall not exceed five (5)
percent of the thickness of the material.
Page
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INDEX •
CORROSION RESISTANCE
PROPERTIES • FABRICATION
NIOBIUM
PRODUCTS • SPECIFICATIONS
of NIOBIUM
NIOBIUM ELECTRONICS APPLICATIONS
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