Guide rolls in non-ferrous rod mills.
guide weld box rolls in welded tube mills.
guides and impeder wear strips on welded tube mills.
ZIRCONIA'S WINNING ATTRIBUTES:
||Non-shedding, non-contaminating |
||Resistant to high temperatures |
||High stiffness |
||Wear resistant |
||Chemically inert - even at
high temperatures |
||Electrical insulator at
moderate temperatures |
ZrO2 finds use in variety of applications in tube and rod
In nonferrous rod mills,
notably copper, the zirconium oxide does not react with the hot copper
promoting extended life of the rolls. Mills supplying the wire
drawing industry specify zirconia because the faying surfaces do not
degrade and contaminate the copper rod. Any contamination of the rod
is a source of breakage when drawing the wire, particularly in the finer
Zirconium oxide also finds use
in the weld boxes on welded tube mills. ZrO2's electrical
insulation properties make it suitable for use on EW and TIG lines.
The electrical insulation assures the weld current goes where the mill
designers expect. Furthermore the current will not pass through the
roll bearings thus extending their life expectancy. The electrical
insulation and non-magnetic properties also benefit the high frequency
weld mills. The rolls do not pick up stray fields from the weld
coils keeping the weld currents in the weld assuring more consistent welds
and higher throughput. The high stiffness of the rolls adds to
tightly controlled joint geometry and a higher quality finished product.
Weld spatter does not stick to zirconia so the mill does not need to shut
down for operators to chip the spatter off the rolls.
Good wear resistance contributes to long life of the rolls. The wear
resistance of the zirconia can be further taken advantage of when used as
a seam guide or as wear shoes on the impeder assembly.
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