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 PF 105

High Cr duplex rolls use the high alloy cast steel (or iron) with up to 6-22% Cr content as the shell's material, and use high strength nodular iron as the core material.

According to the content of carbon, it can be divided into high Cr cast steel rolls and high Cr cast iron rolls. Influenced by the high Cr content, its carbide is M 7 C 3 which has higher hardness, better toughness and extremely good wear resistance than normal carbide. With the high alloy elements and special heat treatment, the matrix has the excellent comprehensive properties at high temperature.

According to the stand used and cooling water in the hot strip mills, high Cr cast steel or high cast iron can be selected. These rolls can be used as the working rolls in the cold mills and tempering mills, and the rings can also be made of these material..

Microstructure:


Example Of typical Hardness Profile.


 
Chemical composition(%)
Symbol
C
Si
Mn
Cr
Ni
Mo
HCr-1
2.4-2.8
0.4-1.0
0.4-1.2
10-15
0.8-2.0
0.7-2.0
HCr-2
2.4-3.0
0.3-0.8
0.5-1.3
14-19
0.8-2.0
0.7-2.0
HCr-3
2.5-3.0
0.3-0.8
0.7-1.5
16-21
0.8-2.0
1.0-1.3
HCrS
0.6-1.4
0.4-1.0
02-1.0
6-15
0.2-1.0
1.0-3.0
 
Physical Properties:
Symbol
Hardness
HS
Tensile strength
MPa
Bending strength
HS
Impact Value
10 4J/m 2
Elastic Modulus
kMPa
 
HCr-1
60-70
500-800
700-1000
4-8
210-225
HCr-2
65-80
500-800
700-1000
4-8
210-225
HCr-3
78-92
600-900
900-1300
4-8
210-225
HCrS
65-85
700-1000
210-225
Neck
35-50
>350
550
4-7
160-190
 
HCr-1 Work rolls for roughing stands of hot strip mills and wide plate mills.
HCr-2 Work rolls for early finishing stands of hot strip mills and rolls for bar, rod mills and seamless tube straitening mills.
HCr-3 Work rolls for cold strip mills and tempering mills.
HCrS Work rolls for roughing and early stands of hot strip mills, for cold strip mills and plate mills
 
The capacity of making:
Diameter of barrel (mm)
Length of barrel (mm)
Net weight (t)
280-1350
400-3100
32(max)

Copyright by Pacific Foundry Company, 2004-2007