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 PF 204

Duplex cast steel back-up rolls are made with double poured process with the addition of Ni, Cr, Mo and adopting special heat treatment the shell structure is tempered sorbite, bainite and a small amount of uniformly distributed fine carbide. The material of core and neck of these duplex cast steel back-up rolls are of high quality low carbon steel and low alloy steel. Therefore it possesses the advantage of high resistance to wear, sufficient resistance to spalling and of high toughness.

Microstructure:


 

APPLICATION:

Duplex cast steel back-up rolls are suitable for the roughing and finishing stands of all types of cold and hot strip mills. This kind of rolls is also applied in carious types of plate and heavy plate mills and Steckel mills.

Microstructure:

The Microstructure of working layer is:
Temper sorbite
Bainite +Temper sobrite

Chemical Composition(%)

Symbol
C
Si
Mn
Cr
Ni
Mo
DCS-1
0.6-1.0
0.3-0.8
1.4-2.4
1.4-2.0
0.8-1.2
0.2-0.6
DCS-2
0.6-1.0
0.3-0.8
1.4-2.4
1.6-2.2
0.8-1.2
0.2-0.6
DCS-3
0.6-1.0
0.3-0.8
1.4-2.4
1.8-2.4
0.8-1.2
0.2-0.6
DCS-4
0.3-0.8
0.3-0.8
0.4-0.8
2.5-3.5
0.6-1.2
0.4-1.0
 

Hardness (HS)

Symbol DCS-1 DCS-2 DCS-3 DCS-4  
BARREL 50-60 55-65 60-70 65-75
Neck 25-45 25-45 25-45 25-45
 

 Mechanical Properties:

Type
Unit
Shell
Neck
 
Tensile Strength
MPa
1200-2000
Min 400
Yeild Strength
MPa
1000-1400
Min 200
Elongation
%
2-10
10-30
Contraction
%
--
15-40
Impact Value
kgf.m/cm
Min 7
Min 24
 

The Capacity of Making:

Diameter of barrel (mm)
Length of barrel (mm)
Net weight (t)
X900-X1800
1000-3200
80
 

Copyright by Pacific Foundry Company, 2004-2007