Information

For certain applications, especially
if insulated wires are used for
heating bimetals, a combination of
several insulation types is
recommended.
Flat wires of resistance alloys are
standardized in DIN 46465. It
should be noted that the nominal
dimensions quoted there often will
not meet the requirements of our
customers and that for this reason
we have chosen a different
gradation.
page 16
At room temperature the alloys
manufactured by us exhibit good
corrosion resistance in the bare
condition. In order to avoid
corrosion during storage, it is
recommended that the environment
should be as dry as possible.
Alloys with a high copper content
have a tendency to surface
corrosion after long periods of
storage.
It should be kept in mind that
oxidized wires of nickel-chromium
alloys can be destroyed when
stored in a moist environment. The
alloy MANGANIN
®
is susceptible to
stress crack corrosion; it also
requires to be stored at a dry place.
The corrosion resistance
characteristics at maximum working
temperature can be seen from the
table on the right.
On completion of soldering, brazing
or welding work the flux must be
removed very thoroughly, since it
can contribute to corrosion,
especially at higher temperatures.
For resistance alloys supplied as
ribbon or sheet, no special standard
exists. Here we apply the
permissible values stated in DIN
1791 for copper and wrought
copper alloys, as regards thickness
and width tolerances.
For stranded wires of resistance
alloys, too, no special standards
exist. The technical terms of
delivery must be negotiated
individually. If stranded wires are
used for heating cables, however,
the regulations of VDE 0253 must
be observed.
On request special tolerance values
can be offered.
E. Corrosion Resistance