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High
hardness increases wear life |
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HARDOX wear
plate has been developed to withstand abrasive
wear. The actual wear life depends on the
material in contact with the plate and the type
of wear to which the subjected.
In the
handling of materials, the equipment is usually
subjected to stress of several types – sliding
and impact wear, also often combined with heavy
deformation. These different wear conditions
would usually demand materials with different
compositions and different properties.
But HARDOX
wear plate with a hardness of 400 to 500 Brinell
can withstand most types of wear. The wear life
of HARDOX 400
may be up to five times longer than that of
ordinary high-strength structural plate. In
certain cases, HARDOX
500 can last more than three times
longer than HARDOX 400. |
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Different
types of wear |
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Wear plate is subjected to two
types of wear.
In case A, hard minerals
in the type of rock being
handled may cut microchips from
the plate (cutting wear). The
surface of the plate is not
sufficiently hard to withstand
this aggressive type of wear. In
case B, the mineral being
handled is not sufficiently hard
to cut chips. The plate surface
is then subjected only to
‘kneading’.
Repeated kneading will gradually
lead to metal fragments breaking
away from the surface. This less
aggressive type of wear is also
known as deformation wear. The
curve in the above graph shows
how the wear life increases with
increasing hardness of the
plate. Note that the dramatic
change in the slope of the curve
indicates that the mineral is no
longer able to cut chips out of
the plate surface.
When subjected to this type of
wear,
HARDOX 400 will have
a wear life which is about five
times longer than ordinary
high-strength plate. |
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The sides and bottom of a concrete mixer
are subjected to sliding wear. However,
the wear applied to the bottom is at a
higher pressure.
Even if the wear is relatively moderate,
the wear life is important to cost of
operation.
In this case,
HARDOX 450 has proven to be
the most appropriate material.
For the best possible wear life,
HARDOX 500 or 600
is used for the bottom of the mixer. |
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