Types of Traditional Wear Plate, their Strengths and Weaknesses. |
QT Plate
(Quenched and Tempered Steel Plate)
This is the process of quenching standard construction steel from high temperatures.
Generally the steel used contains low amounts of Carbon, which is the primary
hardener in steel. This method hardens the outside surface or skin of the metal
leaving the inner core soft. Once the outer hard surface was lost through wear,
the inner soft metal quickly disappears requiring frequent replacement. After
the steel is hardened through quench and tempering, it is difficult to form into
shapes for various applications.
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AR Plate (Abrasion Resistant Plate)
Metallurgists began mixing alloying elements to steel increasing the formation
of abrasion resistant carbonitrides. This created better ductility and improved
impact qualities of the steel.
Overall an increase in wear resistance of AR Plate
is suited to moderate impact and wear applications.
However under extreme impact and wear it does not perform
well. |
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Cast White
Iron
By increasing the alloy content in the metal mix it is possible to create high
chromium white iron castings. These castings have increased wear resistance
over AR plate.
However, due to there casting mould sizes they are
unable to be formed into general components for custom
applications. Also the increased alloy content means
they are unable to be welded in place |
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Cast Ceramics
Ceramics can contain a range of materials such as silica-carbides, aluminium
oxides, and metal alloys that are generally cast into moulds.
Thus not allowing them to be formed into shapes. They
provide excellent abrasion and heat resistance, but
are limited in applications involving moderate to heavy
impact, and are not weldable |
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Cladded
Wear Plate (Chromium Carbide Overlay Plate)
A product was needed that combined the ductility and weld ability properties
of AR Plate and the wear resistance of Cast White Iron. So welding high chromium
white iron electrodes to a mild steel base plate developed a method of Cladding
the two. This creates a wear plate with a high wear resistive surface and a
formable, weldable backing plate. Welding electrodes containing different amounts
and types of alloys are used to manufacture different Cladded Plate for specific
wear factors, eg- high impact or abrasive wear.
Multiple weld passes or layers may increase the thickness
of the white iron cladding. However this results in
the surface becoming brittle and susceptible
to spalling or breaking up. Cladded Wear plate can be formed into a radius
of approximately ten times the nominal thickness with the cladding on the
inside radius. Not all cladded wear plate is created
equal; various manufacturing
processes can dramatically change the wear resistant qualities of the plate.
Some Cladded wear plate can contain flaws like unevenness of the cladded
overlay or cracks between the welds. Also plate distortion
and severe cracking is common
in some manufactured plate due to the intense heating and cooling during
the welding process. This is detrimental to high impact
environments that will
cause the overlay to spall and break apart. The lack of a smooth finished
surface is also a factor in some Cladded plate as this
reduces friction and material
hang-up on machinery. |
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Overview
As you can see, some wear plate is simply old technology
and does not meet today's standards and others are only suited to
specific
applications. However, Cladded Wear Plate is by far
the all round winner. Alloy Steel International have led the way in
developing the
best Fused Alloy Steel Plate with their Arcoplate product
range. They have perfected the cladded technology by a careful manufacturing
process
eliminating all the flaws that competitor's products
contain.
It is important to choose the correct wear plate for a specific application.
The next section will help you determine which wear plate to use for
the different wear factors.
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