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PF
104
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High
Ni-Cr duplex indefinite chilled iron rolls
exhibit excellent properties which are produced
by centrifugal or overflow casting process. The
high micro-hardness of matrix and carbide can be
obtained through adjusting the content of Ni,
Cr, Mo and other alloy elements. A fine and
uniform shell layer with a low hardness fall off
can be obtained with special hear treatment
technique. As with a little of graphite, these
rolls are much more resistant to wearing,
firecraking, spalling and pinching.
The
shell depth may be varied to the particular
application, and the core adopts either grey
iron with ductile or nodular iron with high
strength, which can give core and neck a
satisfactory toughness.
The
sufficient cooling water is essential on the
working rolls.
Microstructure:
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Example of Typical Hardness Profile:
|
| Chemical
Composition (%) |
| Symbol |
C
|
Si
|
Mn
|
Cr
|
Ni
|
Mo
|
| HNiCr-1 |
2.8-3.5
|
0.6-1.1
|
0.4-1.1
|
1.6-2.0
|
4.0-4.5
|
0.2-0.8
|
| HNiCr-2 |
3.0-3.5
|
0.7-1.2
|
0.5-1.2
|
1.4-1.8
|
3.8-4.5
|
0.2-0.8
|
| |
| Physical
Properties: |
| Symbol |
Hardness
HS
|
Tensile
strength
MPa
|
Bending
strength
HS
|
Impact
Value
× 10 4J/m
2
|
Elastic
Modulus
kMPa
|
|
| HNiCr-1 |
70-85
|
350-450
|
450-650
|
3-7
|
150-190
|
| HNiCr-2 |
60-75
|
350-450
|
450-650
|
2-6
|
150-190
|
| Greyy |
35-50
|
>190
|
350
|
3-7
|
110-150
|
| Nodular |
35-50
|
>350
|
350
|
4-7
|
160-190
|
| |
| Application: |
| Work
rolls for finishing final
stands of hot strip mills. |
| Work
rolls for roughing stands
and finishing stands of
wide plate mills. |
| Work
rolls, back-up rolls for
hot strip (plate) temper
mills. |
| Work
rolls for steckel mills. |
| Sleeves
for per-finishing stands
of high-speed wire-rod
mills. |
| Work
rolls for non-ferrous
plate mills. |
| |
| The
Capacity of Making: |
| Methods
of making |
Diameter
of barrel (mm)
|
Length
of barrel (mm)
|
Net
weight
|
|
| |
£X280-1350
|
400-4300
|
45
|
| |
£X800-1300
|
<5500
|
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