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 PF 205

High speed steel (HSS) duplex rolls are manufactured with vertical centrifugal casting process, the shell is HSS with high hardness and excellent wear resistance at high temperature, the core is nodular cast iron with toughness, the comprehensive property is a combination of high wear resistance and toughness.

These rolls are manufactured with high content alloy elements and special heat treatment process, the microstructure of shell is martensite and bainite with plenty of carbides such as MC, M2C and M6C distributed among the matrix, there is only a little hardness drop in the shell. High alloy elements and rehardening give the rolls an excellent wear resistance at high temperature. The outer layer hardness doesn't show a significant drop until the temperature exceeds 550C. and the wear resistance is 3-5 times higher than traditional high NiCr indefinite chilled iron rolls and high Cr iron rolls..

Microstructure:

APPLICATION:
Work rolls for finishing stands for hot strip mills, work rolls for fold strip mills, rings or sleeves for bar, rod mills and universal H-section mills.
 


 

Microstructure:
Martensite + Bainite + Carbide

Chemical Composition(%)

Symbol
C
Si
Mn
Cr
Ni
Mo
v
w
HSS-1
0.6-1.0
0.4-1.5
0.4-1.0
4.0-8.0
0.3-1.5
2.0-8.0
0.4-2.0
1.0-3,0
HSS-2
1.5-2.5
0.3-1.0
0.3-1.5
4.0-8.0
0.3-1.5
2.0-8.0
2.0-10.0
2.0-10.0
                           

Physical Properties:

Symbol
Hardness HS
Tensile Strength MPa
 Elastic Modulus x 10 MPA
HSS-1
70-90
>750
210-220
HSS-2
75-95
>750
210-220
Neck
35-50
>350
140-180
 
 

The Capacity of Making:

Type of Rolls
Diameter of barrel (mm)
Length of barrel (mm)
weight (t)
Rolls
X400-X850
1000-2500
15 (Max)
Sleeves
X200-X1400
700 (Max)
7 (Max)
 

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