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6.
Internal Structure
6.1 Inclusions.The
finished product of a size of 5/8" diameter or less
shall be free of inclusions in excess of 0.013 inch
(equivalent diameter) as determined by ultrasonic inspection
between 1/2Ó and 5/8" diameter. Finished product of
a size greater than 5/8" and less than 2" diameter shall
be free of inclusions in excess of 3% of the product
diameter or 0.032 inch, whichever is smaller. At manufacturer's
discretion ultrasonic inspection may be performed at
the finished size.
6.2
Defects. Defects such as cracks, laminations, and
other ruptures shall be determined by ultrasonic examination
per 6.1.
6.3
Grain Size. The grain size of each lot of finished
product of 5/8" inch diameter or less shall be ASTM
No. 6 or finer. The grain size shall be determined using
the applicable provisions of ASTM E 112. Grain size
of larger diameter product (greater than 1/2 inch) shall
be specified in the purchase order.
7.
Manufacture
7.1
Melting. The melting process shall be a process
that has been established by the Supplier for melting
niobium alloy containing 45/48 wt. % titanium for use
in manufacturing wire for superconducting applications.
7.2
Working. Each ingot shall be reduced during manufacturing
by a process that has been established by the Supplier
for working niobium alloy containing 45/48 wt. % titanium
for use in manufacturing wire for superconducting applications.
7.3
Heat Treatment. Heat treatment shall be accomplished
in a manner which will preclude contamination that might
cause a violation of the chemistry requirements and
will ensure that each item in the lot being heat treated
has essentially the same heat treated properties.
7.4
Fabrication A. Manufacturing, dependent on ingot
size, shall be in accordance with processes established
and shall have a minimum of 75% reduction from ingot
to billet. Material shall then be cold reduced by further
work, a minimum of 50%.
8.
Analytical Chemistry Procedures
The
procedures for analyzing to the chemistry requirements
of this specification shall be in accordance with standards
considered industrially acceptable for the specified
alloys.
9.
Nondestructive Testing Requirements
All
products shall be examined nondestructively in accordance
with the following requirements and shall comply with
the specified acceptance criteria.
Page
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INDEX •
CORROSION RESISTANCE
PROPERTIES • FABRICATION
NIOBIUM
PRODUCTS • SPECIFICATIONS
of NIOBIUM
NIOBIUM ELECTRONICS APPLICATIONS
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