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PF 104

Hight Ni-Cr Alloy Indeffinite Chilled Castiron Rolls

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:


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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